diff --git a/.gitignore b/.gitignore
index 2526a8b..b577009 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,5 @@
 
 *.iml
 .idea/
+pdflatex_stderr.log
+pdflatex_stdout.log
diff --git a/Cargo.lock b/Cargo.lock
index 0c4cf73..db84e0f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4,210 +4,237 @@
 name = "adler32"
 version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5d2e7343e7fc9de883d1b0341e0b13970f764c14101234857d2ddafa1cb1cac2"
 
 [[package]]
 name = "aho-corasick"
 version = "0.7.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "58fb5e95d83b38284460a5fda7d6470aa0b8844d283a0b614b8535e880800d2d"
 dependencies = [
- "memchr 2.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memchr",
 ]
 
 [[package]]
 name = "alga"
 version = "0.9.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "658f9468113d34781f6ca9d014d174c74b73de870f1e0e3ad32079bbab253b19"
 dependencies = [
- "approx 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libm 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "num-complex 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "num-traits 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "approx",
+ "libm",
+ "num-complex",
+ "num-traits",
 ]
 
 [[package]]
 name = "ansi_term"
 version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ee49baf6cb617b853aa8d93bf420db2383fab46d314482ca2803b40d5fde979b"
 dependencies = [
- "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.8",
 ]
 
 [[package]]
 name = "approx"
 version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f0e60b75072ecd4168020818c0107f2857bb6c4e64252d8d3983f6263b40a5c3"
 dependencies = [
- "num-traits 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits",
 ]
 
 [[package]]
 name = "arrayvec"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cff77d8686867eceff3105329d4698d96c2391c176d5d03adc90c7389162b5b8"
 
 [[package]]
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- "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hermit-abi",
+ "libc",
+ "winapi 0.3.8",
 ]
 
 [[package]]
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+checksum = "1d49d90015b3c36167a20fe2810c5cd875ad504b39cff3d4eae7977e6b7c1cb2"
 
 [[package]]
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+checksum = "f8aac770f1885fd7e387acedd76065302551364496e46b3dd00860b2f8359b9d"
 
 [[package]]
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- "rustc-demangle 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "backtrace-sys",
+ "cfg-if",
+ "libc",
+ "rustc-demangle",
 ]
 
 [[package]]
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- "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc",
+ "libc",
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 [[package]]
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+checksum = "e05db47de3b0f09a222fa4bba2eab957d920d4243962a86b2d77ab401e4a359c"
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+ "glib",
+ "glib-sys",
+ "gobject-sys",
+ "libc",
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- "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
- "pkg-config 0.3.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib-sys",
+ "libc",
+ "pkg-config",
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- "vec_map 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ansi_term",
+ "atty",
+ "bitflags",
+ "strsim",
+ "textwrap",
+ "unicode-width",
+ "vec_map",
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 [[package]]
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 version = "0.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ddfc5b9aa5d4507acaf872de71051dfd0e309860e88966e1051e462a077aac4f"
 dependencies = [
- "bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bitflags",
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 [[package]]
@@ -215,8 +242,8 @@ name = "codespan"
 version = "0.2.1"
 source = "git+https://github.com/oberien/codespan?rev=dc7b13739165fc58721415ce3120d05cf117ca81#dc7b13739165fc58721415ce3120d05cf117ca81"
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- "failure 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "itertools 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure",
+ "itertools 0.8.2",
 ]
 
 [[package]]
@@ -224,1653 +251,1831 @@ name = "codespan-reporting"
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- "termcolor 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "codespan",
+ "termcolor",
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+checksum = "888604f00b3db336d2af898ec3c1d5d0ddf5e6d462220f2ededc33a87ac4bbd5"
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+ "idna 0.1.5",
+ "log",
+ "publicsuffix",
+ "serde",
+ "serde_json",
+ "time",
+ "try_from",
+ "url 1.7.2",
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+ "autocfg 0.1.7",
+ "cfg-if",
+ "crossbeam-utils 0.7.0",
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-"checksum unicode-bidi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "49f2bd0c6468a8230e1db229cff8029217cf623c767ea5d60bfbd42729ea54d5"
-"checksum unicode-normalization 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)" = "5479532badd04e128284890390c1e876ef7a993d0570b3597ae43dfa1d59afa4"
-"checksum unicode-segmentation 1.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e83e153d1053cbb5a118eeff7fd5be06ed99153f00dbcd8ae310c5fb2b22edc0"
-"checksum unicode-width 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)" = "caaa9d531767d1ff2150b9332433f32a24622147e5ebb1f26409d5da67afd479"
-"checksum unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "fc72304796d0818e357ead4e000d19c9c174ab23dc11093ac919054d20a6a7fc"
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-"checksum url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)" = "dd4e7c0d531266369519a4aa4f399d748bd37043b00bde1e4ff1f60a120b355a"
-"checksum url 2.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "829d4a8476c35c9bf0bbce5a3b23f4106f79728039b726d292bb93bc106787cb"
-"checksum utf-8 0.7.5 (registry+https://github.com/rust-lang/crates.io-index)" = "05e42f7c18b8f902290b009cde6d651262f956c98bc51bca4cd1d511c9cd85c7"
-"checksum uuid 0.7.4 (registry+https://github.com/rust-lang/crates.io-index)" = "90dbc611eb48397705a6b0f6e917da23ae517e4d127123d2cf7674206627d32a"
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-"checksum vec_map 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "05c78687fb1a80548ae3250346c3db86a80a7cdd77bda190189f2d0a0987c81a"
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-"checksum void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
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-"checksum winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
-"checksum winreg 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "b2986deb581c4fe11b621998a5e53361efe6b48a151178d0cd9eeffa4dc6acc9"
-"checksum ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d59cefebd0c892fa2dd6de581e937301d8552cb44489cdff035c6187cb63fa5e"
-"checksum xml-rs 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)" = "b07db065a5cf61a7e4ba64f29e67db906fb1787316516c4e6e5ff0fea1efcd8a"
+checksum = "b07db065a5cf61a7e4ba64f29e67db906fb1787316516c4e6e5ff0fea1efcd8a"
diff --git a/Cargo.toml b/Cargo.toml
index 4ab18ee..f1b1584 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,6 +15,7 @@ typed-arena = "1.4.1"
 url = "1.7.1"
 reqwest = "0.9.2"
 serde = { version = "1.0.89", features = ["derive"] }
+serde_json = "1.0.61"
 toml = "0.5.0"
 log = "0.4.5"
 env_logger = "0.5.13"
diff --git a/examples/crate/.gitignore b/examples/crate/.gitignore
new file mode 100644
index 0000000..2526a8b
--- /dev/null
+++ b/examples/crate/.gitignore
@@ -0,0 +1,5 @@
+/target
+**/*.rs.bk
+
+*.iml
+.idea/
diff --git a/examples/crate/Cargo.lock b/examples/crate/Cargo.lock
new file mode 100644
index 0000000..ba84263
--- /dev/null
+++ b/examples/crate/Cargo.lock
@@ -0,0 +1,5 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "example-crate"
+version = "0.1.0"
diff --git a/examples/crate/Cargo.toml b/examples/crate/Cargo.toml
new file mode 100644
index 0000000..d18608c
--- /dev/null
+++ b/examples/crate/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "example-crate"
+version = "0.1.0"
+authors = ["Andreas Molzer <andreas.molzer@gmx.de>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/examples/crate/src/lib.rs b/examples/crate/src/lib.rs
new file mode 100644
index 0000000..21d9924
--- /dev/null
+++ b/examples/crate/src/lib.rs
@@ -0,0 +1,142 @@
+#![allow(dead_code)]
+#![allow(unused_variables)]
+
+/// Documented module abc.
+pub mod abc {
+    /// A simple type.
+    pub struct SimpleType;
+}
+
+/// A struct with repr annotation.
+///
+/// # Usage
+///
+/// Just throw some struct on the wall:
+/// ```rust
+/// use example_crate::KindOfReprC;
+/// let x = KindOfReprC;
+/// ```
+///
+/// ## Deep section
+/// ### Deeper section
+/// #### I'm a dwarf
+#[repr(C)]
+pub struct KindOfReprC(pub u8);
+
+/// This is used as a return type.
+pub struct ReturnType;
+
+/// An enum with different variants.
+pub enum AnEnum {
+    VariantA,
+    VariantB,
+    VariantStruct {
+        a: ReturnType,
+        b: usize,
+    },
+}
+
+/// Really, a simple union, basically MaybeUninit.
+pub union TestUnion {
+    /// Use this to make everything be uninitialized.
+    pub a: (),
+    pub b: usize,
+}
+
+/// This is a simple typdef, don't worry.
+pub type TypeDef = KindOfReprC;
+
+pub struct WithGenerics<A, B: Clone> {
+    _kay: core::marker::PhantomData<(A, B)>,
+}
+
+/// A trait demonstrating advanced bounds.
+pub trait WhatThe<F>: Clone
+where
+    F: std::fmt::Debug
+{}
+
+/// An amazing trait item with a few features.
+pub trait ThisIsATrait: Clone {
+    /// An associated constant.
+    const CONSTANT: usize;
+    /// An associated type.
+    type Type: Copy;
+    /// An ordinary method taking `&self`.
+    fn method(&self, param: usize);
+    /// A generic method with explicit bound.
+    fn generic<T>(&self, t: T) -> usize
+        where T: Copy;
+    /// An ordinary static method.
+    fn static_method(a: usize);
+    /// A method that should have an unsafe qualifier.
+    unsafe fn unsafe_method();
+    /// A method that should have extern "C".
+    extern "C" fn extern_method();
+    /// A method provided by default by the trait.
+    fn provided(&self) -> usize {
+        0
+    }
+}
+
+pub trait EasyToImpl {
+    /// A type that must be declared.
+    type ToDeclare: Clone;
+    /// A constant attribute that needs to be defined.
+    const An_ATTRIBTE: usize;
+    /// A method you do need to impl.
+    fn method_to_impl(&self);
+    /// A provided method you do not need to impl.
+    fn method_not_to_impl(&self) {}
+}
+
+impl KindOfReprC {
+    pub const CONSTANT: usize = 0;
+
+    /// An associated method of KindOfReprC
+    pub fn new() -> Self {
+        KindOfReprC(0)
+    }
+}
+
+pub mod imports {
+    pub use crate::KindOfReprC;
+    /// Glob imports, anyone?
+    pub use crate::AnEnum::*;
+}
+
+/// Implements the EasyToImpl trait for KindOfReprC.
+impl EasyToImpl for KindOfReprC {
+    type ToDeclare = usize;
+    const An_ATTRIBTE: usize = 0;
+    fn method_to_impl(&self) {}
+}
+
+/// A normal function.
+pub fn function_item(param: usize) -> ReturnType {
+    ReturnType
+}
+
+/// A function with a very long signature.
+pub fn complicated_function(
+    long_parameter_name_but_still_okay: usize,
+    oh_no_a_second_parameter: usize,
+    and_a_third_one_definitely_makes_the_signature_long: usize,
+) -> usize {
+    0
+}
+
+/// A function with a non-Rust ABI.
+pub extern "C" fn extern_c() {}
+
+/// A static, not a constant.
+pub static A_STATIC: KindOfReprC = KindOfReprC(0);
+
+/// A constant with some arbitrary type.
+pub const A_CONST: KindOfReprC = KindOfReprC(0u8);
+/// A literal number.
+pub const A_CONST_LITERAL: u8 = 0u8;
+/// Wow, more literals.
+pub const A_STR_LITERAL: &'static str = "string literal";
+/// So hidden from public view.
+const PRIVATE_CONST: u8 = 0;
diff --git a/examples/references.bib b/examples/references.bib
new file mode 100644
index 0000000..2d20fe1
--- /dev/null
+++ b/examples/references.bib
@@ -0,0 +1,18 @@
+@online{foo,
+  year = {2018},
+  author = {{oberien}},
+  title = {{Heradoc - Markdown to Latex / Pdf Converter}},
+  url = {https://example.com/},
+  urldate = {2018-09-18},
+}
+@online{bar,
+  year = {1337},
+  author = {{Author}},
+  title = {Title},
+  url = {url},
+}
+@online{wikipedia-markdown,
+  title = {Markdown Logo},
+  urldate = 2019-08-18,
+  url = {https://upload.wikimedia.org/wikipedia/commons/thumb/4/48/Markdown-mark.svg/208px-Markdown-mark.svg.png},
+}
diff --git a/examples/rustdoc.md b/examples/rustdoc.md
new file mode 100644
index 0000000..4779b30
--- /dev/null
+++ b/examples/rustdoc.md
@@ -0,0 +1 @@
+![](rustdoc:crate)
diff --git a/examples/rustdoc.pdf b/examples/rustdoc.pdf
new file mode 100644
index 0000000..3920c73
Binary files /dev/null and b/examples/rustdoc.pdf differ
diff --git a/src/backend/latex/complex/header.rs b/src/backend/latex/complex/header.rs
index 865e367..0c07f7f 100644
--- a/src/backend/latex/complex/header.rs
+++ b/src/backend/latex/complex/header.rs
@@ -3,7 +3,7 @@ use std::io::Write;
 
 use crate::backend::{Backend, CodeGenUnit, StatefulCodeGenUnit, latex::Beamer};
 use crate::config::Config;
-use crate::error::Result;
+use crate::error::{Error, Result};
 use crate::frontend::range::{WithRange, SourceRange};
 use crate::generator::event::{Event, Header};
 use crate::generator::Generator;
@@ -19,7 +19,26 @@ impl<'a> CodeGenUnit<'a, Header<'a>> for HeaderGen<'a> {
         gen: &mut Generator<'a, impl Backend<'a>, impl Write>,
     ) -> Result<Self> {
         let WithRange(Header { label, level }, _range) = header;
-        write!(gen.get_out(), "\\{}section{{", "sub".repeat(level as usize - 1))?;
+
+        if level > 3 {
+            if level > 6 {
+                gen.diagnostics()
+                    .error("Latex backed does not support header nesting more than 6 levels.")
+                    .emit();
+
+                return Err(Error::Diagnostic);
+            }
+
+            const MORE_HEADERS: [&str; 3] = [
+                "heradocsectionfour",
+                "heradocsectionfive",
+                "heradocsectionsix",
+            ];
+
+            write!(gen.get_out(), "\\{}{{", MORE_HEADERS[level as usize - 4])?;
+        } else {
+            write!(gen.get_out(), "\\{}section{{", "sub".repeat(level as usize - 1))?;
+        }
         Ok(HeaderGen { label })
     }
 
diff --git a/src/backend/latex/document/article.rs b/src/backend/latex/document/article.rs
index f1395cb..afa892d 100644
--- a/src/backend/latex/document/article.rs
+++ b/src/backend/latex/document/article.rs
@@ -71,6 +71,7 @@ impl<'a> Backend<'a> for Article {
         // TODO: itemizespacing
         preamble::write_documentclass(cfg, out, "scrartcl", "")?;
         preamble::write_packages(cfg, out)?;
+        preamble::write_deep_headers(cfg, out)?;
         preamble::write_fixes(cfg, out)?;
 
         writeln!(out)?;
diff --git a/src/backend/latex/document/thesis.rs b/src/backend/latex/document/thesis.rs
index 86f22c1..0079f8c 100644
--- a/src/backend/latex/document/thesis.rs
+++ b/src/backend/latex/document/thesis.rs
@@ -141,7 +141,7 @@ fn gen_abstract(path: PathBuf, abstract_name: &str, cfg: &Config, out: &mut impl
         }
     };
     let input = Input::File(path);
-    let events = gen.get_events(markdown, context, input);
+    let events = gen.get_events(markdown.into(), context, input);
     gen.generate_body(events)?;
     Ok(())
 }
diff --git a/src/backend/latex/preamble.rs b/src/backend/latex/preamble.rs
index 8325c48..2497907 100644
--- a/src/backend/latex/preamble.rs
+++ b/src/backend/latex/preamble.rs
@@ -141,6 +141,31 @@ pub fn write_fixes(cfg: &Config, out: &mut impl Write) -> Result<()> {
     Ok(())
 }
 
+pub fn write_deep_headers(cfg: &Config, out: &mut impl Write) -> Result<()> {
+    fn write_simple_header(name: &str, into: &mut impl Write,  font: &str, level: i32) -> Result<()> {
+        writeln!(into, "{}", "\\makeatletter")?;
+        write!(into, r#"\newcommand\{}"#, name)?;
+        write!(into, "{}{}{}{}", r#"{\@startsection{"#, name, "}{", level)?;
+        write!(into, "{}", r#"}{\z@}%
+                                {-3.5ex \@plus -1ex \@minus -.2ex}%
+                                {2.3ex \@plus.2ex}%
+                                {\sffamily"#)?;
+        write!(into, "{}", font)?;
+        write!(into, "{}", r#"}
+            }
+            \newcommand{"#)?;
+        write!(into, r#"\{}mark"#, name)?;
+        writeln!(into, "{}", r#"}[1]{}"#)?;
+        writeln!(into, "{}", "\\makeatother")?;
+        Ok(())
+    }
+
+    write_simple_header("heradocsectionfour", out, "\\fontsize{14.4pt}{\\f@baselineskip}\\fontseries{b}\\selectfont", 4)?;
+    write_simple_header("heradocsectionfive", out, "\\fontsize{12pt}{\\f@baselineskip}\\fontseries{b}\\selectfont", 5)?;
+    write_simple_header("heradocsectionsix", out, "\\fontsize{12pt}{\\f@baselineskip}\\fontshape{it}\\selectfont", 6)?;
+    Ok(())
+}
+
 /// Allows configuration of the short author field when writing the maketitle info.
 ///
 /// Some document types like beamer support a short author field like `\author[short-author]{author}`.
@@ -165,7 +190,7 @@ pub fn write_maketitle_info(cfg: &Config, short_author: ShortAuthor, out: &mut i
     }
     if cfg.titlehead.is_some() || cfg.logo_university.is_some() {
         match cfg.document_type {
-            DocumentType::Article | DocumentType::Report | DocumentType::Thesis => {
+            DocumentType::Article | DocumentType::Report | DocumentType::Thesis | DocumentType::RustDoc => {
                 writeln!(out, "\\titlehead{{")?;
                 let mut joiner = OutJoiner::new(&mut *out, "\\\\");
                 if let Some(titlehead) = &cfg.titlehead {
diff --git a/src/backend/mod.rs b/src/backend/mod.rs
index 3a268d7..6216126 100644
--- a/src/backend/mod.rs
+++ b/src/backend/mod.rs
@@ -43,6 +43,13 @@ pub fn generate<'a>(
     Ok(())
 }
 
+pub fn generate_rust_docs<'a>(
+    cfg: &'a Config, backend: impl Backend<'a>, arena: &'a Arena<String>, what_cargo: String,
+    out: impl Write, stderr: Arc<Mutex<StandardStream>>,
+) -> FatalResult<()> {
+    todo!()
+}
+
 #[rustfmt::skip]
 pub trait Backend<'a>: Sized + Debug {
     // MediumCodeGenUnits are used for leaf-events, which don't contain any further events.
diff --git a/src/config/mod.rs b/src/config/mod.rs
index 728e32f..3113f60 100644
--- a/src/config/mod.rs
+++ b/src/config/mod.rs
@@ -61,6 +61,8 @@ pub struct FileConfig {
     /// Defaults to tex for stdout.
     #[structopt(short = "t", long = "to", long = "out-type", long = "output-type")]
     pub output_type: Option<OutType>,
+    #[structopt(short = "c", long = "cache", long = "cache-dir")]
+    pub cache_dir: Option<PathBuf>,
 
     /// Type of the document.
     #[structopt(long)]
@@ -247,6 +249,11 @@ pub struct Config {
     /// directory.  This prevents content injection from untrusted sources and is currently the
     /// result of choosing this path randomly.  TODO: Make this restriction explicit.
     pub temp_dir: PathBuf,
+    /// Space for downloaded (or generated?) input files.
+    ///
+    /// Defaults to the `temp_dir` if not otherwise configured.
+    /// TODO: Similar restrictions as to `temp_dir` apply.
+    pub cache_dir: PathBuf,
     pub input: FileOrStdio,
     pub document_folder: PathBuf,
     pub project_root: PathBuf,
@@ -454,8 +461,15 @@ impl Config {
 
         Config {
             output,
-            out_dir: args.out_dir.unwrap_or_else(|| tempdir.path().to_owned()),
+            out_dir: args.out_dir
+                .unwrap_or_else(|| tempdir.path().to_owned()),
             temp_dir: tempdir_path,
+            cache_dir: {
+                let configured = infile.cache_dir
+                    .or(file.cache_dir)
+                    .unwrap_or_else(|| tempdir.path().to_owned());
+                project_root.join(configured)
+            },
             input: args.input,
             document_folder,
             project_root,
@@ -480,7 +494,7 @@ impl Config {
                 .unwrap_or(MaybeUnknown::Known(CitationStyle::Ieee)),
             figures: args.fileconfig.figures.or(infile.figures).or(file.figures).unwrap_or_else(
                 || match document_type {
-                    DocumentType::Article | DocumentType::Beamer => false,
+                    DocumentType::Article | DocumentType::Beamer | DocumentType::RustDoc => false,
                     DocumentType::Thesis | DocumentType::Report => true,
                 },
             ),
@@ -692,6 +706,7 @@ pub enum DocumentType {
     Report,
     Thesis,
     Beamer,
+    RustDoc,
 }
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Deserialize, Display, EnumString)]
diff --git a/src/frontend/event.rs b/src/frontend/event.rs
index 7ecce8c..7576459 100644
--- a/src/frontend/event.rs
+++ b/src/frontend/event.rs
@@ -5,7 +5,7 @@ pub use pulldown_cmark::Alignment;
 use enum_kinds::EnumKind;
 
 use crate::frontend::range::WithRange;
-use crate::resolve::{Command, ResolveSecurity};
+use crate::resolve::{Command, Include as ResolvedInclude, ResolveSecurity};
 
 // extension of pulldown_cmark::Event with custom types
 #[derive(Debug, EnumKind)]
@@ -27,6 +27,8 @@ pub enum Event<'a> {
     Include(Include<'a>),
     /// Include to be resolved by the resolver
     ResolveInclude(Cow<'a, str>),
+    /// An include generated by an internal frontend, to simulate file inclusion.
+    SyntheticInclude(ResolvedInclude, Include<'a>, Cow<'a, str>),
     Label(Cow<'a, str>),
     SoftBreak,
     HardBreak,
@@ -151,6 +153,7 @@ pub struct Include<'a> {
     pub scale: Option<WithRange<Cow<'a, str>>>,
     pub width: Option<WithRange<Cow<'a, str>>>,
     pub height: Option<WithRange<Cow<'a, str>>>,
+    pub adjust_headers: bool,
 }
 
 #[derive(Debug, Clone)]
diff --git a/src/frontend/mod.rs b/src/frontend/mod.rs
index 44d34c0..8aa69a4 100644
--- a/src/frontend/mod.rs
+++ b/src/frontend/mod.rs
@@ -15,6 +15,7 @@ mod convert_cow;
 mod event;
 pub mod range;
 mod refs;
+pub mod rustdoc;
 mod size;
 mod table_layout;
 
@@ -443,6 +444,7 @@ impl<'a> Frontend<'a> {
                     scale: cskvp.take_double("scale"),
                     width: cskvp.take_double("width"),
                     height: cskvp.take_double("height"),
+                    adjust_headers: false,
                 }), svgbob_range));
                 return;
             },
@@ -840,6 +842,7 @@ impl<'a> Frontend<'a> {
                 scale: cskvp.take_double("scale"),
                 width: cskvp.take_double("width"),
                 height: cskvp.take_double("height"),
+                adjust_headers: false,
             }),
             range,
         ))
diff --git a/src/frontend/rustdoc/mod.rs b/src/frontend/rustdoc/mod.rs
new file mode 100644
index 0000000..4310d1f
--- /dev/null
+++ b/src/frontend/rustdoc/mod.rs
@@ -0,0 +1,1507 @@
+use std::borrow::Cow;
+use std::collections::{HashSet, VecDeque};
+use std::fs::File;
+use std::fmt::Write as _;
+use std::sync::Arc;
+use std::path::PathBuf;
+use std::process::Command;
+
+use itertools::Itertools as _;
+
+use crate::config::Config;
+use crate::diagnostics::Diagnostics;
+use crate::error::{Fatal, FatalResult};
+use crate::frontend::{self, Event, Include, Tag};
+use crate::frontend::range::WithRange;
+use crate::resolve::{Context, Include as ResolvedInclude, ResolveSecurity};
+
+/// Contains the type definitions, all implementing Deserialize.
+mod types;
+
+use types::{Item, ItemEnum};
+
+#[derive(Debug)]
+pub struct Rustdoc<'a> {
+    cfg: &'a Config,
+    diagnostics: Arc<Diagnostics<'a>>,
+    krate: types::Crate,
+    /// The dynamic state. Implements the actual traversal methods, taking references to the crate
+    /// data.
+    appender: RustdocAppender<'a>,
+}
+
+#[derive(Debug)]
+struct RustdocAppender<'a> {
+    context: Context,
+    simulated_source_path: PathBuf,
+    /// Stack of started, but not yet finished, portions of the documentation.
+    stack: Vec<Traversal>,
+    /// A buffer of events, yielded before continuing with the stack.
+    buffered: VecDeque<Event<'a>>,
+    diagnostics: Arc<Diagnostics<'a>>,
+}
+
+pub enum Crate {
+    Local(PathBuf),
+}
+
+/// Denotes some part of the crate which we have not yet fully documented.
+#[derive(Debug)]
+enum Traversal {
+    /// Initially gather crate state, and put root item on stack.
+    Root,
+    /// Traverse into an item, dispatching on its kind.
+    Item(types::Id),
+}
+
+impl<'a> Iterator for Rustdoc<'a> {
+    type Item = Event<'a>;
+    fn next(&mut self) -> Option<Self::Item> {
+        loop {
+            if let Some(buffered) = self.appender.buffered.pop_front() {
+                return Some(buffered);
+            }
+
+            if let Some(traverse) = self.appender.stack.pop() {
+                self.traverse(traverse);
+            } else {
+                return None;
+            }
+        }
+    }
+}
+
+impl Crate {
+    /// Invoke rustdoc to generate the json for this target.
+    pub fn generate(&self, diag: &Diagnostics<'_>) -> FatalResult<types::Crate> {
+        match self {
+            Crate::Local(path) => {
+                let metadata = Command::new("cargo")
+                    .args(&["metadata", "--format-version", "1"])
+                    .current_dir(&path)
+                    .output()?;
+
+                if !metadata.status.success() {
+                    diag
+                        .error("Cargo metadata failed for crate")
+                        .note(String::from_utf8_lossy(&metadata.stderr))
+                        .emit();
+                    return Err(Fatal::Output(std::io::Error::new(
+                        std::io::ErrorKind::InvalidData,
+                        "Metadata call failed",
+                    )));
+                }
+
+                let meta: types::WorkspaceMetadata = match serde_json::from_slice(&metadata.stdout) {
+                    Ok(meta) => meta,
+                    Err(err) => {
+                        diag
+                            .error("Failed to parse cargo metadata")
+                            .emit();
+                        return Err(Fatal::Output(err.into()));
+                    }
+                };
+
+                let mut target = PathBuf::from(meta.target_directory);
+                target.push("doc");
+                let krate = meta.workspace_members[0].split(' ').next().unwrap();
+
+                let format = Command::new("cargo")
+                    .args(&["+nightly", "rustdoc", "-p"])
+                    .arg(&krate)
+                    .args(&["--", "--output-format", "json"])
+                    .current_dir(&path)
+                    .output()?;
+
+                if !format.status.success() {
+                    diag
+                        .error("Compiling rustdoc failed")
+                        .note(String::from_utf8_lossy(&metadata.stdout))
+                        .note(String::from_utf8_lossy(&metadata.stderr))
+                        .note(format!("Compiling `{}` in `{}`", krate, path.display()))
+                        .emit();
+                    return Err(Fatal::Output(std::io::Error::new(
+                        std::io::ErrorKind::InvalidData,
+                        "Metadata call failed",
+                    )));
+                }
+
+                target.push({
+                    // FIXME: support actually renamed library targets?
+                    let lib_name = format!("{}.json", krate);
+                    lib_name.replace("-", "_")
+                });
+
+                let file = match File::open(&target) {
+                    Ok(file) => file,
+                    Err(err) => {
+                        diag
+                            .error("Failed to open rustdoc output data")
+                            .note(target.display().to_string())
+                            .emit();
+                        return Err(Fatal::Output(err));
+                    }
+                };
+
+                match serde_json::from_reader(file) {
+                    Ok(krate) => Ok(krate),
+                    Err(err) => {
+                        diag
+                            .error("Cargo metadata failed for crate")
+                            .note(String::from_utf8_lossy(&format.stderr))
+                            .note(err.to_string())
+                            .emit();
+                        Err(Fatal::Output(err.into()))
+                    }
+                }
+            }
+        }
+    }
+}
+
+impl<'a> Rustdoc<'a> {
+    pub fn new(
+        cfg: &'a Config,
+        krate: types::Crate,
+        diagnostics: Arc<Diagnostics<'a>>,
+        context: Context,
+    ) -> Rustdoc<'a> {
+        Rustdoc {
+            cfg,
+            diagnostics: Arc::clone(&diagnostics),
+            krate,
+            appender: RustdocAppender::new(cfg, diagnostics, context),
+        }
+    }
+
+    pub fn context(&self) -> &Context {
+        &self.appender.context
+    }
+
+    pub fn diagnostics(&self) -> Arc<Diagnostics<'a>> {
+        self.diagnostics.clone()
+    }
+}
+
+impl<'a> Rustdoc<'a> {
+    /// Get the next item while traversing a particular item.
+    /// This will also push more items or a remaining tail to its stack.
+    fn traverse(&mut self, what: Traversal) {
+        match what {
+            Traversal::Root => self.appender.root(&self.krate),
+            Traversal::Item(id) => self.append_item_by_id(&id),
+        }
+    }
+
+    fn append_item_by_id(&mut self, id: &types::Id) {
+        if let Some(item) = self.krate.index.get(id) {
+            let krate = &self.krate;
+            match item {
+                Item { inner: ItemEnum::ModuleItem(inner), .. } => {
+                    self.appender.module(krate, item, inner);
+                },
+                Item { inner: ItemEnum::StructItem(inner), .. } => {
+                    self.appender.struct_(krate, item, inner);
+                },
+                Item { inner: ItemEnum::EnumItem(inner), .. } => {
+                    self.appender.enum_(krate, item, inner);
+                },
+                Item { inner: ItemEnum::ConstantItem(inner), .. } => {
+                    self.appender.constant(krate, item, inner);
+                },
+                Item { inner: ItemEnum::StaticItem(inner), .. } => {
+                    self.appender.static_(krate, item, inner);
+                },
+                Item { inner: ItemEnum::FunctionItem(inner), .. } => {
+                    self.appender.function(krate, item, inner);
+                },
+                Item { inner: ItemEnum::TraitItem(inner), .. } => {
+                    self.appender.trait_(krate, item, inner);
+                },
+                Item { inner: ItemEnum::ImplItem(inner), .. } => {
+                    self.appender.impl_(krate, item, inner);
+                },
+                Item { inner: ItemEnum::TypedefItem(inner), .. } => {
+                    self.appender.typedef(krate, item, inner);
+                },
+                Item { inner: ItemEnum::ImportItem(inner), .. } => {
+                    self.appender.import(krate, item, inner);
+                },
+                Item { inner: ItemEnum::ExternCrateItem { name, rename }, .. } => {
+                    self.appender.extern_item(krate, item, name, rename.as_ref());
+                },
+                Item { kind: types::ItemKind::Primitive, .. }
+                | Item { kind: types::ItemKind::Keyword, .. } => {},
+                _ => eprintln!("Unimplemented {:?}", item),
+            }
+        } else {
+            self.invalid_item(Traversal::Item(id.clone()));
+        }
+    }
+
+    /// Invoked when we encounter an unexpected item/reference.
+    fn invalid_item(&mut self, what: Traversal) {
+        let mut builder = self.appender.diagnostics
+            .bug("Unexpected item in rustdoc json output")
+            .note(format!("Traversing {:?}", what));
+
+        if let Traversal::Item(id) = what {
+            if let Some(item) = self.krate.index.get(&id) {
+                if let Some(name) = &item.name {
+                    builder = builder.note(name);
+                }
+
+                builder = builder.note(format!("Source Span {:?}", item.source));
+            }
+        }
+
+        builder.emit();
+    }
+}
+
+impl<'a> RustdocAppender<'a> {
+    fn new(
+        cfg: &'a Config,
+        diagnostics: Arc<Diagnostics<'a>>,
+        context: Context,
+    ) -> Self {
+        RustdocAppender {
+            context,
+            simulated_source_path: cfg.temp_dir.clone(),
+            stack: vec![Traversal::Root],
+            buffered: VecDeque::new(),
+            diagnostics,
+        }
+    }
+
+    fn root(&mut self, krate: &types::Crate) {
+        let label = self.label_for_id(&krate.root, krate).unwrap();
+        let header = frontend::Header {
+            label: WithRange(Cow::Owned(label), (0..0).into()),
+            level: 1,
+        };
+
+        self.buffered.push_back(Event::Start(Tag::Header(header.clone())));
+        self.buffered.push_back(Event::Text({
+            let root = krate.paths.get(&krate.root).unwrap();
+            let lib_name = root.path[0].clone();
+            Cow::Owned(lib_name)
+        }));
+        self.buffered.push_back(Event::End(Tag::Header(header)));
+
+        if krate.includes_private {
+            self.buffered.push_back(Event::Text(Cow::Borrowed(
+                "Note: This development documentation includes private items which are not accessible from the outside.",
+            )));
+        }
+
+        self.stack.push(Traversal::Item(krate.root.clone()));
+    }
+
+    // Handle the individual items.
+    // Each methods types the crate environment, the full item, and its specialized enum internals.
+
+    fn module(&mut self, krate: &types::Crate, item: &Item, module: &types::Module) {
+        let summary = krate.paths.get(&item.id)
+            // FIXME: this should fail and diagnose the rendering process, not panic.
+            .expect("Bad item ID");
+        let label = self.label_for_item_at_path(&summary.path);
+
+        let header = frontend::Header {
+            label: WithRange(Cow::Owned(label), (0..0).into()),
+            level: 2,
+        };
+
+        // Add a header.
+        self.buffered.push_back(Event::Start(Tag::Header(header.clone())));
+        self.buffered.push_back(Event::Text({
+            let qualifier = if module.is_crate { "Crate" } else { "Module" };
+            let meta = Self::codify_visibility(&item.visibility);
+            let module_name = self.name_for_item_at_path(&summary.path);
+            Cow::Owned(format!("{} {}{}", qualifier, meta, module_name))
+        }));
+        self.buffered.push_back(Event::End(Tag::Header(header)));
+
+        // Describe all children in text.
+        self.buffered.push_back(Event::Start(Tag::List));
+        for child in &module.items {
+            self.buffered.push_back(Event::Start(Tag::Item));
+            if let Some(target) = krate.paths.get(child) {
+                let child_label = self.label_for_item_at_path(&target.path);
+
+                let link = frontend::InterLink {
+                    label: Cow::Owned(child_label),
+                    uppercase: false,
+                };
+
+                self.buffered.push_back(Event::Start(Tag::InterLink(link.clone())));
+                self.buffered.push_back(Event::Text({
+                    let item_name = self.name_for_item_at_path(&target.path);
+                    Cow::Owned(item_name)
+                }));
+                self.buffered.push_back(Event::End(Tag::InterLink(link)));
+            } else if let Some(Item { name: Some(name), .. }) = krate.index.get(child) {
+                self.buffered.push_back(Event::Text(name.clone().into()));
+            } else if let Some(item) = krate.index.get(child) {
+                eprintln!("Encountered weird module child: {:?}", item);
+            } else {
+                eprintln!("Encountered weird module child with no item: {:?}", child);
+            }
+
+            self.buffered.push_back(Event::End(Tag::Item));
+        }
+        self.buffered.push_back(Event::End(Tag::List));
+
+        // And queue to dispatch into children.
+        for child in module.items.iter().rev() {
+            self.stack.push(Traversal::Item(child.clone()))
+        }
+    }
+
+    fn struct_(&mut self, krate: &types::Crate, item: &Item, struct_: &types::Struct) {
+        let summary = krate.paths.get(&item.id)
+            // FIXME: this should fail and diagnose the rendering process, not panic.
+            .expect("Bad item ID");
+        let name = item.name
+            .as_ref()
+            .expect("Struct without a name");
+
+        // Avoid allocating too much below..
+        if struct_.fields.len() >= 1_000_000 {
+            panic!("Number of fields too large, considering opening a pull request to turn this into an iterative procedure.");
+        }
+
+        let meta = Self::codify_visibility(&item.visibility);
+
+        let mut def: String = item.attrs
+            .iter()
+            .map(String::as_str)
+            .interleave_shortest(std::iter::repeat("\n"))
+            .collect();
+
+        let (header_title, title) = match item.kind {
+            types::ItemKind::Union => ("Union", "union"),
+            types::ItemKind::Struct => ("Struct", "struct"),
+            _ => unreachable!("Unexpected struct kind"),
+        };
+
+        self.append_header_for_inner_item(header_title, item, summary);
+
+        write!(&mut def, "{}{} {}", meta, title, name)
+            .expect("Writing to string succeeds");
+        def.push_str(&self.codify_generics(krate, &struct_.generics));
+        let (start_tag, end_tag) = match struct_.struct_type {
+            types::StructType::Plain => ("{\n", "}"),
+            types::StructType::Tuple => ("(\n", ")"),
+            types::StructType::Unit => ("", ";"),
+        };
+
+        def.push_str(start_tag);
+        let mut field_documentation = vec![];
+        for field_id in &struct_.fields {
+            match krate.index.get(field_id) {
+                Some(Item {
+                    inner: ItemEnum::StructFieldItem(field),
+                    name: Some(name),
+                    visibility,
+                    docs,
+                    ..
+                }) => {
+                    let meta = Self::codify_visibility(visibility);
+                    let type_name = self.codify_type(krate, field);
+                    def.push_str("    ");
+                    def.push_str(&meta);
+                    if let types::StructType::Tuple = struct_.struct_type {} else {
+                        def.push_str(name);
+                        def.push_str(": ");
+                    }
+                    def.push_str(&type_name);
+                    def.push_str(",\n");
+                    field_documentation.push((name, field, type_name, docs));
+                }
+                Some(other) => {
+                    self.diagnostics
+                        .warning(format!("Unhandled variant item: {:?}", other))
+                        .note(format!("In enum {}", self.name_for_item_at_path(&summary.path)))
+                        .emit();
+                }
+                None => unreachable!("Enum item does not exist?"),
+            }
+        }
+
+        if struct_.fields_stripped {
+            def.push_str("    // some fields omitted\n");
+        }
+        def.push_str(end_tag);
+
+        self.buffered.push_back(Event::Start(Tag::CodeBlock(Self::RUST_CODE_BLOCK)));
+        self.buffered.push_back(Event::Text(Cow::Owned(def)));
+        self.buffered.push_back(Event::End(Tag::CodeBlock(Self::RUST_CODE_BLOCK)));
+
+        self.append_item_docs(item);
+
+        // FIXME: we would like a level-4 header..
+        if !field_documentation.is_empty() {
+            self.buffered.push_back(Event::Start(Tag::Paragraph));
+            self.buffered.push_back(Event::Start(Tag::InlineStrong));
+            self.buffered.push_back(Event::Text(Cow::Borrowed("Fields")));
+            self.buffered.push_back(Event::End(Tag::InlineStrong));
+            self.buffered.push_back(Event::End(Tag::Paragraph));
+        }
+
+        for (name, _field_type, type_name, docs) in field_documentation {
+            self.buffered.push_back(Event::Start(Tag::Paragraph));
+
+            self.buffered.push_back(Event::Start(Tag::InlineCode));
+            self.buffered.push_back(Event::Text(Cow::Owned(name.clone())));
+            self.buffered.push_back(Event::Text(Cow::Borrowed(": ")));
+            // FIXME: link to the type, if appropriate.
+            // self.buffered.push_back(Event::Start(Tag::InterLink(field_type_link.clone())));
+            self.buffered.push_back(Event::Text(Cow::Owned(type_name.clone())));
+            // self.buffered.push_back(Event::End(Tag::InterLink(field_type_link.clone())));
+            self.buffered.push_back(Event::End(Tag::InlineCode));
+
+            if let Some(docs) = docs {
+                self.buffered.push_back(Event::Text(Cow::Borrowed("  ")));
+                // FIXME: treat as recursive markdown?
+                self.append_docs(docs.clone());
+            }
+
+            self.buffered.push_back(Event::End(Tag::Paragraph));
+        }
+
+        self.append_impls(krate, item, &struct_.impls);
+    }
+
+    fn constant(&mut self, krate: &types::Crate, item: &Item, constant: &types::Constant) {
+        let summary = krate.paths.get(&item.id)
+            // FIXME: this should fail and diagnose the rendering process, not panic.
+            .expect("Bad item ID");
+        self.append_header_for_inner_item("Constant", item, summary);
+
+        let meta = Self::codify_visibility(&item.visibility);
+        let mut def = format!("{}const ", meta);
+        match &item.name {
+            Some(name) => def.push_str(name),
+            // FIXME: error handling.
+            _ => panic!("Const without a name"),
+        }
+        def.push_str(": ");
+        def.push_str(&self.codify_type(krate, &constant.type_));
+        def.push_str(" = ");
+        // TODO: what about constant.value??
+        def.push_str(&constant.expr);
+        def.push(';');
+
+        self.buffered.push_back(Event::Start(Tag::CodeBlock(Self::RUST_CODE_BLOCK)));
+        self.buffered.push_back(Event::Text(Cow::Owned(def)));
+        self.buffered.push_back(Event::End(Tag::CodeBlock(Self::RUST_CODE_BLOCK)));
+
+        self.append_item_docs(item);
+    }
+
+    fn static_(&mut self, krate: &types::Crate, item: &Item, constant: &types::Static) {
+        let summary = krate.paths.get(&item.id)
+            // FIXME: this should fail and diagnose the rendering process, not panic.
+            .expect("Bad item ID");
+        self.append_header_for_inner_item("Static", item, summary);
+
+        let meta = Self::codify_visibility(&item.visibility);
+        let mut def = format!("{}static ", meta);
+        if constant.mutable {
+            def.push_str("mut ");
+        }
+        match &item.name {
+            Some(name) => def.push_str(name),
+            // FIXME: error handling.
+            _ => panic!("Static without a name"),
+        }
+        def.push_str(": ");
+        def.push_str(&self.codify_type(krate, &constant.type_));
+        // TODO: or don't ignore `expr`?
+        def.push(';');
+
+        self.buffered.push_back(Event::Start(Tag::CodeBlock(Self::RUST_CODE_BLOCK)));
+        self.buffered.push_back(Event::Text(Cow::Owned(def)));
+        self.buffered.push_back(Event::End(Tag::CodeBlock(Self::RUST_CODE_BLOCK)));
+
+        self.append_item_docs(item);
+    }
+
+    fn function(&mut self, krate: &types::Crate, item: &Item, function: &types::Function) {
+        let summary = krate.paths.get(&item.id)
+            // FIXME: this should fail and diagnose the rendering process, not panic.
+            .expect("Bad item ID");
+        let name = item.name
+            .as_ref()
+            .expect("Unnamed method");
+        self.append_header_for_inner_item("Function", item, summary);
+
+        let meta = Self::codify_visibility(&item.visibility);
+        let header = self.codify_qualifiers(&function.header);
+        let abi = Self::codify_abi(&function.abi);
+        let signature = self.codify_fn_decl(krate, &function.decl);
+        // FIXME: generics, bounds.
+        let def = format!("{}{}{}fn {}{}", meta, header, abi, name, signature);
+
+        self.buffered.push_back(Event::Start(Tag::CodeBlock(Self::RUST_CODE_BLOCK)));
+        self.buffered.push_back(Event::Text(Cow::Owned(def)));
+        self.buffered.push_back(Event::End(Tag::CodeBlock(Self::RUST_CODE_BLOCK)));
+
+        self.append_item_docs(item);
+    }
+
+    fn enum_(&mut self, krate: &types::Crate, item: &Item, enum_: &types::Enum) {
+        let summary = krate.paths.get(&item.id)
+            // FIXME: this should fail and diagnose the rendering process, not panic.
+            .expect("Bad item ID");
+
+        // Avoid allocating too much below..
+        if enum_.variants.len() >= 1_000_000 {
+            panic!("Number of variants too large, considering opening a pull request to turn this into an iterative procedure.");
+        }
+
+        let meta = Self::codify_visibility(&item.visibility);
+        let enum_name = self.name_for_item_at_path(&summary.path);
+
+        let mut def: String = item.attrs
+            .iter()
+            .map(String::as_str)
+            .interleave_shortest(std::iter::repeat("\n"))
+            .collect();
+
+        write!(&mut def, "{}enum {}", meta, enum_name)
+            .expect("Writing to string succeeds");
+        def.push_str(&self.codify_generics(krate, &enum_.generics));
+        def.push_str(" {\n");
+        self.append_header_for_inner_item("Enum", item, summary);
+
+        let mut variant_documentation = vec![];
+        for variant_id in &enum_.variants {
+            if let Some(Item {
+                inner: ItemEnum::VariantItem(variant),
+                name: Some(name),
+                visibility,
+                docs,
+                ..
+            }) = krate.index.get(variant_id) {
+                // Enum items do not have visibility for now..
+                let _ = Self::codify_visibility(visibility);
+                // FIXME: Different variant kinds.
+                writeln!(&mut def, "    {},", name)
+                    .expect("Writing to string succeeds");
+                variant_documentation.push((name, variant, docs));
+            } else {
+                // FIXME: should not occur.
+            }
+        }
+
+        if enum_.variants_stripped {
+            def.push_str("    // some variants omitted\n");
+        }
+        def.push('}');
+
+        self.buffered.push_back(Event::Start(Tag::CodeBlock(Self::RUST_CODE_BLOCK)));
+        self.buffered.push_back(Event::Text(Cow::Owned(def)));
+        self.buffered.push_back(Event::End(Tag::CodeBlock(Self::RUST_CODE_BLOCK)));
+
+        self.append_item_docs(item);
+
+        // FIXME: we would like a level-4 header..
+        if !variant_documentation.is_empty() {
+            self.buffered.push_back(Event::Start(Tag::Paragraph));
+            self.buffered.push_back(Event::Start(Tag::InlineStrong));
+            self.buffered.push_back(Event::Text(Cow::Borrowed("Variants")));
+            self.buffered.push_back(Event::End(Tag::InlineStrong));
+            self.buffered.push_back(Event::End(Tag::Paragraph));
+        }
+
+        for (name, _variant, docs) in variant_documentation {
+            self.buffered.push_back(Event::Start(Tag::Paragraph));
+
+            self.buffered.push_back(Event::Start(Tag::InlineCode));
+            // FIXME: struct variants, including links.
+            self.buffered.push_back(Event::Text(Cow::Owned(name.clone())));
+            self.buffered.push_back(Event::End(Tag::InlineCode));
+
+            if let Some(docs) = docs {
+                self.buffered.push_back(Event::Text(Cow::Borrowed("  ")));
+                self.append_docs(docs.clone());
+            }
+
+            self.buffered.push_back(Event::End(Tag::Paragraph));
+        }
+
+        self.append_impls(krate, item, &enum_.impls);
+    }
+
+    fn trait_(&mut self, krate: &types::Crate, item: &Item, trait_: &types::Trait) {
+        let summary = krate.paths.get(&item.id)
+            // FIXME: this should fail and diagnose the rendering process, not panic.
+            .expect("Bad item ID");
+
+        // Avoid allocating too much below..
+        if trait_.items.len() >= 1_000_000 {
+            panic!("Number of fields too large, considering opening a pull request to turn this into an iterative procedure.");
+        }
+
+        let vis = Self::codify_visibility(&item.visibility);
+        let safe = if trait_.is_unsafe { "unsafe " } else { "" };
+        let auto = if trait_.is_auto { "auto " } else { "" };
+        let trait_name = item.name.as_ref()
+            .expect("Trait without name");
+
+        let mut def: String = item.attrs
+            .iter()
+            .map(String::as_str)
+            .interleave_shortest(std::iter::repeat("\n"))
+            .collect();
+
+        write!(&mut def, "{}{}{}trait {}", vis, safe, auto, trait_name)
+            .expect("Writing to string succeeds");
+
+        let generic_params = trait_.generics.params
+            .iter()
+            .map(|param| self.codify_generic_param(krate, param))
+            .intersperse(String::from(", "));
+
+        if !trait_.generics.params.is_empty() {
+            def.push('<');
+            def.push_str(&generic_params.collect::<String>());
+            def.push('>');
+        }
+
+        let mut bounds = trait_.bounds
+            .iter()
+            .map(|bound| self.codify_generic_bound(krate, bound));
+
+        if let Some(first) = bounds.next() {
+            if trait_.bounds.len() > 2 {
+                def.push_str("\n  : ");
+                def.push_str(&first);
+                let bounds = bounds
+                    .intersperse(String::from("\n  + "))
+                    .collect::<String>();
+                def.push_str(&bounds);
+            } else {
+                def.push_str(": ");
+                def.push_str(&first);
+                for rest in bounds {
+                    def.push_str(" + ");
+                    def.push_str(&rest);
+                }
+            }
+        }
+
+        let predicates = trait_.generics.where_predicates
+            .iter()
+            .map(|pred| self.codify_generic_predicate(krate, pred))
+            .intersperse(String::from(",\n    "));
+
+        if !trait_.generics.where_predicates.is_empty() {
+            def.push_str("\nwhere\n    ");
+            def.push_str(&predicates.collect::<String>());
+            def.push_str("\n");
+        } else {
+            def.push(' ');
+        }
+
+        self.append_header_for_inner_item("Trait", item, summary);
+
+        // TODO: print replication of definition.
+        let mut trait_items = vec![];
+        // FIXME: bounds
+        def.push_str("{\n");
+        for item_id in &trait_.items {
+            match krate.index.get(item_id) {
+                Some(Item {
+                    inner: ItemEnum::AssocTypeItem { bounds, default },
+                    name: Some(name),
+                    docs,
+                    ..
+                }) => {
+                    def.push_str("    type ");
+                    def.push_str(name);
+                    let mut bounds = bounds.iter();
+                    if let Some(first) = bounds.next() {
+                        def.push_str(": ");
+                        def.push_str(&self.codify_generic_bound(krate, first));
+                        for rest in bounds {
+                            def.push_str(" + ");
+                            def.push_str(&self.codify_generic_bound(krate, rest));
+                        }
+                    }
+                    if let Some(type_) = default {
+                        def.push_str(" = ");
+                        def.push_str(&self.codify_type(krate, type_));
+                    }
+                    def.push_str(";\n");
+
+                    trait_items.push((name, docs));
+                }
+                Some(Item {
+                    inner: ItemEnum::AssocConstItem { type_, default },
+                    name: Some(name),
+                    docs,
+                    ..
+                }) => {
+                    def.push_str("    ");
+                    def.push_str(name);
+                    def.push_str(": ");
+                    let type_ = self.codify_type(krate, type_);
+                    def.push_str(&type_);
+                    if let Some(default) = &default {
+                        def.push_str(" = ");
+                        def.push_str(default);
+                    }
+                    def.push_str(";\n");
+
+                    trait_items.push((name, docs));
+                }
+                Some(Item {
+                    inner: ItemEnum::MethodItem(method),
+                    name: Some(name),
+                    docs,
+                    ..
+                }) => {
+                    def.push_str("    ");
+                    def.push_str(&self.codify_qualifiers(&method.header));
+                    def.push_str("fn ");
+                    def.push_str(name);
+                    // FIXME: generics
+                    let type_ = self.codify_fn_decl(krate, &method.decl);
+                    def.push_str(&type_);
+                    // FIXME(rustdoc): show if it is defaulted?; as alternative for this terminator if so.
+                    def.push_str(";\n");
+
+                    trait_items.push((name, docs));
+                }
+                Some(other) => {
+                    self.diagnostics
+                        .warning(format!("Unhandled trait item: {:?}", other))
+                        .note(format!("In {}", self.name_for_item_at_path(&summary.path)))
+                        .emit();
+                }
+                None => unreachable!("Trait item does not exist?"),
+            }
+        }
+        def.push('}');
+
+        self.buffered.push_back(Event::Start(Tag::CodeBlock(Self::RUST_CODE_BLOCK)));
+        self.buffered.push_back(Event::Text(Cow::Owned(def)));
+        self.buffered.push_back(Event::End(Tag::CodeBlock(Self::RUST_CODE_BLOCK)));
+
+        self.append_item_docs(item);
+
+        // TODO: differentiate between constants, types, required methods, provided methods
+        // FIXME: we would like a level-4 header..
+        if !trait_items.is_empty() {
+            self.buffered.push_back(Event::Start(Tag::Paragraph));
+            self.buffered.push_back(Event::Start(Tag::InlineStrong));
+            self.buffered.push_back(Event::Text(Cow::Borrowed("Associated items")));
+            self.buffered.push_back(Event::End(Tag::InlineStrong));
+            self.buffered.push_back(Event::End(Tag::Paragraph));
+        }
+
+        // FIXME: add full declaration with links.
+        for (name, docs) in trait_items {
+            self.buffered.push_back(Event::Start(Tag::Paragraph));
+
+            self.buffered.push_back(Event::Start(Tag::InlineCode));
+            // FIXME: struct variants, including links.
+            self.buffered.push_back(Event::Text(Cow::Owned(name.clone())));
+            self.buffered.push_back(Event::End(Tag::InlineCode));
+
+            if let Some(docs) = docs {
+                self.buffered.push_back(Event::Text(Cow::Borrowed("  ")));
+                self.append_docs(docs.clone())
+            }
+
+            self.buffered.push_back(Event::End(Tag::Paragraph));
+        }
+    }
+
+    fn impl_(&mut self, krate: &types::Crate, item: &Item, impl_: &types::Impl) {
+        let mut impl_header = String::from("impl");
+        impl_header.push_str(&self.codify_generics(krate, &impl_.generics));
+        // FIXME: generics
+        impl_header.push(' ');
+        if let Some(trait_) = &impl_.trait_ {
+            if impl_.negative {
+                impl_header.push('!');
+            }
+            impl_header.push_str(&self.codify_type(krate, trait_));
+            impl_header.push_str(" for ");
+        }
+        impl_header.push_str(&self.codify_type(krate, &impl_.for_));
+
+        self.buffered.push_back(Event::Start(Tag::Paragraph));
+        self.buffered.push_back(Event::Start(Tag::InlineCode));
+        self.buffered.push_back(Event::Text(Cow::Owned(impl_header)));
+        self.buffered.push_back(Event::End(Tag::InlineCode));
+        self.buffered.push_back(Event::End(Tag::Paragraph));
+
+        if let Some(docs) = &item.docs {
+            self.buffered.push_back(Event::Start(Tag::Paragraph));
+            self.buffered.push_back(Event::Text(docs.clone().into()));
+            self.buffered.push_back(Event::End(Tag::Paragraph));
+        }
+
+        let mut impl_items = vec![];
+
+        for item_id in &impl_.items {
+            match krate.index.get(item_id) {
+                Some(Item {
+                    inner: ItemEnum::TypedefItem(typedef),
+                    name: Some(name),
+                    visibility,
+                    docs,
+                    ..
+                }) => {
+                    let meta = Self::codify_visibility(visibility);
+                    let mut def = format!("  {}type ", meta);
+                    def.push_str(name);
+                    def.push_str(" = ");
+                    def.push_str(&self.codify_type(krate, &typedef.type_));
+                    def.push_str(";\n");
+
+                    impl_items.push((name, def, docs));
+                }
+                Some(Item {
+                    inner: ItemEnum::ConstantItem(const_),
+                    name: Some(name),
+                    visibility,
+                    docs,
+                    ..
+                }) => {
+                    let meta = Self::codify_visibility(visibility);
+                    let mut def = format!("  {}const ", meta);
+                    def.push_str(name);
+                    def.push_str(": ");
+                    def.push_str(&self.codify_type(krate, &const_.type_));
+                    def.push_str(" = ");
+                    def.push_str(&const_.expr);
+                    def.push_str(";\n");
+
+                    impl_items.push((name, def, docs));
+                }
+                // FIXME(rustdoc): this is only due to an internal bug in rustdoc where associated
+                // constants ( impl Type { pub const A: usize = 0 ) appear as AssocConstItem
+                // instead which would be more appropriate for a trait.
+                Some(Item {
+                    inner: ItemEnum::AssocConstItem { type_, default: Some(const_def) },
+                    name: Some(name),
+                    visibility,
+                    docs,
+                    ..
+                }) => {
+                    let meta = Self::codify_visibility(visibility);
+                    let mut def = format!("  {}const ", meta);
+                    def.push_str(name);
+                    def.push_str(": ");
+                    def.push_str(&self.codify_type(krate, type_));
+                    def.push_str(" = ");
+                    def.push_str(const_def);
+                    def.push_str(";\n");
+
+                    impl_items.push((name, def, docs));
+                }
+                Some(Item {
+                    inner: ItemEnum::MethodItem(method),
+                    name: Some(name),
+                    visibility,
+                    docs,
+                    ..
+                }) => {
+                    let meta = Self::codify_visibility(visibility);
+                    let mut def = format!("  {}", meta);
+                    def.push_str(&self.codify_qualifiers(&method.header));
+                    def.push_str(" fn");
+                    def.push_str(name);
+                    def.push_str(&self.codify_generics(krate, &method.generics));
+                    def.push_str(&self.codify_fn_decl(krate, &method.decl));
+
+                    impl_items.push((name, def, docs));
+                }
+                Some(Item {
+                    inner: ItemEnum::FunctionItem(function),
+                    name: Some(name),
+                    visibility,
+                    docs,
+                    ..
+                }) => {
+                    let meta = Self::codify_visibility(visibility);
+                    let mut def = format!("  {}", meta);
+                    def.push_str(&self.codify_qualifiers(&function.header));
+                    def.push_str(" fn");
+                    def.push_str(name);
+                    def.push_str(&self.codify_generics(krate, &function.generics));
+                    def.push_str(&self.codify_fn_decl(krate, &function.decl));
+
+                    impl_items.push((name, def, docs));
+                }
+                Some(other) => {
+                    self.diagnostics
+                        .warning(format!("Unhandled impl item: {:?}", other))
+                        .emit();
+                }
+                None => unreachable!("Trait item does not exist?"),
+            }
+        }
+
+        for (_name, definition, docs) in impl_items {
+            self.buffered.push_back(Event::Start(Tag::Paragraph));
+            self.buffered.push_back(Event::Start(Tag::InlineCode));
+            self.buffered.push_back(Event::Text(Cow::Owned(definition)));
+            self.buffered.push_back(Event::End(Tag::InlineCode));
+            self.buffered.push_back(Event::End(Tag::Paragraph));
+
+            if let Some(docs) = &docs {
+                self.buffered.push_back(Event::Start(Tag::Paragraph));
+                self.buffered.push_back(Event::Text(docs.clone().into()));
+                self.buffered.push_back(Event::End(Tag::Paragraph));
+            }
+        }
+    }
+
+    fn typedef(&mut self, krate: &types::Crate, item: &Item, typedef: &types::Typedef) {
+        let summary = krate.paths.get(&item.id)
+            // FIXME: this should fail and diagnose the rendering process, not panic.
+            .expect("Bad item ID");
+        let name = item.name
+            .as_ref()
+            .expect("Typedef without name");
+
+        self.append_header_for_inner_item("Typedef", item, summary);
+
+        let meta = Self::codify_visibility(&item.visibility);
+        let mut def = format!("{}type ", meta);
+        def.push_str(name);
+        def.push_str(" = ");
+        def.push_str(&self.codify_type(krate, &typedef.type_));
+        def.push(';');
+
+        self.buffered.push_back(Event::Start(Tag::CodeBlock(Self::RUST_CODE_BLOCK)));
+        self.buffered.push_back(Event::Text(Cow::Owned(def)));
+        self.buffered.push_back(Event::End(Tag::CodeBlock(Self::RUST_CODE_BLOCK)));
+
+        self.append_item_docs(item);
+    }
+
+    fn label_for_id(&self, path: &types::Id, krate: &types::Crate) -> Option<String> {
+        match krate.paths.get(path) {
+            Some(summary) => Some(self.label_for_item_at_path(&summary.path)),
+            None => None,
+        }
+    }
+
+    fn codify_visibility(visibility: &types::Visibility) -> String {
+        match visibility {
+            types::Visibility::Public => "pub ".to_string(),
+            types::Visibility::Default => "".to_string(),
+            types::Visibility::Crate => "pub(crate) ".to_string(),
+            types::Visibility::Restricted  { parent: _, path } => {
+                format!("pub({}) ", path)
+            },
+        }
+    }
+
+    fn append_docs(&mut self, docs: String) {
+        // Include recursively as Markdown.
+        let include = ResolvedInclude::Markdown(
+            self.simulated_source_path.clone(),
+            self.context.clone(),
+        );
+
+        let parameter = Include {
+            // Important: Scope sections under it.
+            adjust_headers: true,
+            // Rest of parameters are default.
+            resolve_security: ResolveSecurity::Default,
+            label: None,
+            caption: None,
+            title: None,
+            alt_text: None,
+            // FIXME: need a good way to express this?
+            dst: "/".into(),
+            scale: None,
+            width: None,
+            height: None,
+        };
+        let source = docs.into();
+        self.buffered.push_back(Event::SyntheticInclude(include, parameter, source));
+    }
+
+    fn append_item_docs(&mut self, item: &types::Item) {
+        if let Some(docs) = &item.docs {
+            self.buffered.push_back(Event::Start(Tag::Paragraph));
+            self.append_docs(docs.clone());
+            self.buffered.push_back(Event::End(Tag::Paragraph));
+        }
+    }
+
+    fn codify_abi(abi: &str) -> String {
+        match abi {
+            "\"Rust\"" => String::new(),
+            other => format!("extern {} ", other),
+        }
+    }
+
+    fn codify_type(&self, krate: &types::Crate, type_: &types::Type) -> String {
+        #[allow(clippy::enum_glob_use)]
+        use types::Type::*;
+        match type_ {
+            ResolvedPath { name, args, param_names, .. } => {
+                // FIXME: when name is empty, then the type should be named through its path!
+                // That happens in things such as:
+                // ```
+                // impl<P> Deref for Type<P> {
+                //     type Target = <P as Trait>::SomeType;
+                // }
+                // ```
+                //
+                // Here the Target is described as a QualifiedPath and the `trait_` attribute
+                // refers to the `Trait` via a ResolvedPath without a name.
+                let mut name = name.clone();
+                match args.as_ref().map(|a| &**a) {
+                    None => {},
+                    Some(types::GenericArgs::AngleBracketed { args, bindings }) => {
+                        let str_args = args
+                            .iter()
+                            .map(|arg| self.codify_generic_arg(krate, arg));
+
+                        let str_bindings = bindings
+                            .iter()
+                            .map(|arg| self.codify_generic_binding(krate, arg));
+
+                        let str_all = str_args
+                            .chain(str_bindings)
+                            .intersperse(String::from(", "));
+
+                        if !args.is_empty() || !bindings.is_empty() {
+                            name.push('<');
+                            name.push_str(&str_all.collect::<String>());
+                            name.push('>');
+                        }
+                    },
+                    Some(types::GenericArgs::Parenthesized { .. }) => {
+                        self.diagnostics
+                            .warning("Encountered parenthesized type arguments, those are unimplemented")
+                            .emit();
+                    },
+                }
+                name
+            },
+            Generic(st) | Primitive(st) => st.clone(),
+            Tuple(items) => {
+                let mut items = items.iter();
+                let first = match items.next() {
+                    None => return "()".into(),
+                    Some(first) => first,
+                };
+                let mut name = format!("({}", self.codify_type(krate, first));
+                for type_ in items {
+                    name.push(',');
+                    name.push_str(&self.codify_type(krate, type_));
+                }
+                name.push(')');
+                name
+            },
+            Slice(inner) => format!("[{}]", self.codify_type(krate, inner)),
+            Array { type_, len } => {
+                format!("[{}; {}]", self.codify_type(krate, type_), len)
+            },
+            // ImplTrait..
+            Never => "!".into(),
+            Infer => "_".into(),
+            RawPointer { mutable, type_ } => {
+                let qualifier = if *mutable { "mut" } else { "const" };
+                format!("*{} {}", qualifier, self.codify_type(krate, type_))
+            }
+            BorrowedRef { lifetime, mutable, type_ } => {
+                let lifetime = lifetime.as_ref().map_or_else(String::new, |st| format!("{} ", st));
+                let qualifier = if *mutable { "mut " } else { "" };
+                let type_ = self.codify_type(krate, type_);
+                format!("&{}{}{}", lifetime, qualifier, type_)
+            }
+            QualifiedPath { name, self_type, trait_ } => {
+                let self_type = self.codify_type(krate, self_type);
+                let trait_ = self.codify_type(krate, trait_);
+                format!("<{} as {}>::{}", self_type, trait_, name)
+            }
+            ImplTrait(bounds) => {
+                let mut bounds = bounds.iter();
+                if let Some(first) = bounds.next() {
+                    let mut bound = String::from("impl ");
+                    bound.push_str(&self.codify_generic_bound(krate, first));
+                    for rest in bounds {
+                        bound.push_str(" + ");
+                        bound.push_str(&self.codify_generic_bound(krate, rest));
+                    }
+                    bound
+                } else {
+                    unreachable!("impl type without any named bounds");
+                }
+            }
+            FunctionPointer(fnptr) => {
+                // FIXME: for<'a> lifetime parameters.
+                let mut base = self.codify_qualifiers(&fnptr.header);
+                if !fnptr.abi.is_empty() {
+                    base.push_str("extern ");
+                    base.push_str(&fnptr.abi);
+                    base.push(' ');
+                }
+                base.push_str(&self.codify_fn_decl(krate, &fnptr.decl));
+                base
+            }
+        }
+    }
+
+    fn import(&mut self, krate: &types::Crate, item: &types::Item, import: &types::Import) {
+        let summary = krate.paths.get(&item.id)
+            // FIXME: this should fail and diagnose the rendering process, not panic.
+            .expect("Bad item ID");
+
+        self.append_header_for_inner_item("Import", item, summary);
+
+        let mut def = Self::codify_visibility(&item.visibility);
+        def.push_str("use ");
+        def.push_str(&import.span);
+        def.push_str(";");
+
+        self.buffered.push_back(Event::Start(Tag::CodeBlock(Self::RUST_CODE_BLOCK)));
+        self.buffered.push_back(Event::Text(Cow::Owned(def)));
+        self.buffered.push_back(Event::End(Tag::CodeBlock(Self::RUST_CODE_BLOCK)));
+
+        if let Some(docs) = &item.docs {
+            self.buffered.push_back(Event::Start(Tag::Paragraph));
+            self.buffered.push_back(Event::Text(docs.clone().into()));
+            self.buffered.push_back(Event::End(Tag::Paragraph));
+        }
+    }
+
+    // FIXME(rustdoc) for some reason this also represents re-exports right now.
+    //     pub mod inner { pub struct Outer; }
+    //     pub use inner::Outer;
+    fn extern_item(&mut self, krate: &types::Crate, item: &types::Item, import: &String, rename: Option<&String>) {
+        let header = frontend::Header {
+            label: WithRange(Cow::Borrowed(""), (0..0).into()),
+            level: 2,
+        };
+
+        let meta = Self::codify_visibility(&item.visibility);
+        self.buffered.push_back(Event::Start(Tag::Header(header.clone())));
+        self.buffered.push_back(Event::Text({
+            Cow::Owned(format!("Re-export {}{}", meta, import))
+        }));
+        self.buffered.push_back(Event::End(Tag::Header(header.clone())));
+
+        let mut def = Self::codify_visibility(&item.visibility);
+        def.push_str("use ");
+        def.push_str(&import);
+        if let Some(rename) = rename {
+            def.push_str(" as ");
+            def.push_str(rename);
+        }
+        def.push_str(";");
+
+        self.buffered.push_back(Event::Start(Tag::CodeBlock(Self::RUST_CODE_BLOCK)));
+        self.buffered.push_back(Event::Text(Cow::Owned(def)));
+        self.buffered.push_back(Event::End(Tag::CodeBlock(Self::RUST_CODE_BLOCK)));
+
+        if let Some(docs) = &item.docs {
+            self.buffered.push_back(Event::Start(Tag::Paragraph));
+            self.buffered.push_back(Event::Text(docs.clone().into()));
+            self.buffered.push_back(Event::End(Tag::Paragraph));
+        }
+    }
+
+    fn codify_fn_decl(&self, krate: &types::Crate, decl: &types::FnDecl) -> String {
+        let inputs: Vec<_> = decl.inputs
+            .iter()
+            .map(|(name, type_)| {
+                format!("{}: {}", name, self.codify_type(krate, type_))
+            })
+            .collect();
+
+        let in_len: usize = inputs.iter().map(|st| st.chars().count()).sum();
+
+        let output = if let Some(type_) = &decl.output {
+            format!(" -> {}", self.codify_type(krate, type_))
+        } else {
+            "".into()
+        };
+
+        let out_len: usize = output.chars().count();
+
+        // FIXME: this simplistic model counts unicode code points.
+        // It would be more accurate to use something else.
+
+        // We have three styles:
+        // * (arg, arg, arg) -> Output
+        // * (arg, arg, arg)
+        //     -> Output
+        // * (
+        //       arg1,
+        //       arg2,
+        //   ) -> Output
+        // *
+        // Break around (), break between args, break before output.
+        let (list_break, arg_break, out_break) = if in_len + out_len < 80 {
+            // Same line for everything, arguments and output
+            (false, false, false)
+        } else if in_len < 120 {
+            (true, false, true)
+        } else {
+            (true, true, false)
+        };
+
+        let mut decl = String::from("(");
+        if list_break {
+            decl.push_str("\n    ");
+        }
+        let mut inputs = inputs.into_iter();
+        if let Some(first) = inputs.next() {
+            decl.push_str(&first);
+            for rest in inputs {
+                if arg_break {
+                    decl.push_str(",\n    ");
+                } else {
+                    decl.push_str(", ");
+                }
+                decl.push_str(&rest);
+            }
+        }
+        if list_break {
+            decl.push('\n');
+        }
+        decl.push(')');
+        if out_break {
+            decl.push_str("\n ");
+        }
+        decl.push_str(&output);
+        decl
+    }
+
+    fn codify_generics(&self, krate: &types::Crate, bound: &types::Generics) -> String {
+        let generics = bound.params
+            .iter()
+            .map(|param| self.codify_generic_param(krate, param))
+            .intersperse(String::from(", "));
+
+        let predicates = bound.where_predicates
+            .iter()
+            .map(|pred| self.codify_generic_predicate(krate, pred))
+            .intersperse(String::from(",\n    "));
+
+        match (bound.params.is_empty(), bound.where_predicates.is_empty()) {
+            (false, false) => format!(
+                "<{}>\nwhere\n    {}",
+                generics.collect::<String>(),
+                predicates.collect::<String>()
+            ),
+            (true, false) => format!("\nwhere\n    {}", predicates.collect::<String>()),
+            (false, true) => format!("<{}>", generics.collect::<String>()),
+            (true, true) => String::new(),
+        }
+    }
+
+    fn codify_qualifiers(&self, quals: &HashSet<types::Qualifiers>) -> String {
+        let mut quals = quals.clone();
+        let mut stringified = String::new();
+
+        if quals.remove(&types::Qualifiers::Async) {
+            stringified.push_str(" async");
+        }
+
+        if quals.remove(&types::Qualifiers::Const) {
+            stringified.push_str(" const");
+        }
+
+        if quals.remove(&types::Qualifiers::Unsafe) {
+            stringified.push_str(" unsafe");
+        }
+
+        if let Some(non_space) = stringified.find(|c| c != ' ') {
+            let _ = stringified.drain(..non_space);
+        }
+
+        stringified
+    }
+
+    fn codify_generic_param(&self, krate: &types::Crate, param: &types::GenericParamDef) -> String {
+        match &param.kind {
+            types::GenericParamDefKind::Lifetime => param.name.clone(),
+            types::GenericParamDefKind::Type { bounds, default } => {
+                let str_bounds = bounds
+                    .iter()
+                    .map(|bound| self.codify_generic_bound(krate, bound))
+                    .intersperse(String::from(" + "));
+                let mut def = param.name.clone();
+                if !bounds.is_empty() {
+                    def.push_str(": ");
+                    def.push_str(&str_bounds.collect::<String>());
+                }
+                if let Some(default) = default {
+                    def.push_str(" = ");
+                    def.push_str(&self.codify_type(krate, default));
+                }
+                def
+            },
+            types::GenericParamDefKind::Const(const_) => {
+                format!("const {}: {}", &param.name, self.codify_type(krate, const_))
+            },
+        }
+    }
+
+    fn codify_generic_predicate(&self, krate: &types::Crate, predicate: &types::WherePredicate) -> String {
+        match predicate {
+            types::WherePredicate::BoundPredicate { ty, bounds } => {
+                let bound: String = bounds
+                    .iter()
+                    .map(|bound| self.codify_generic_bound(krate, bound))
+                    .intersperse(String::from(" + "))
+                    .collect();
+                format!("{}: {}", self.codify_type(krate, ty), bound)
+            },
+            types::WherePredicate::RegionPredicate { lifetime, bounds } => {
+                let bound: String = bounds
+                    .iter()
+                    .map(|bound| self.codify_generic_bound(krate, bound))
+                    .intersperse(String::from(" + "))
+                    .collect();
+                format!("{}: {}", lifetime, bound)
+            },
+            types::WherePredicate::EqPredicate { lhs: _, rhs: _ } => {
+                self.diagnostics
+                    .warning("Equality bounds are not yet supported and will be ignored")
+                    .emit();
+                String::new()
+            },
+        }
+    }
+
+    fn codify_generic_arg(&self, krate: &types::Crate, arg: &types::GenericArg) -> String {
+        match arg {
+            types::GenericArg::Lifetime(lifetime) => lifetime.clone(),
+            types::GenericArg::Type(type_) => self.codify_type(krate, type_),
+            types::GenericArg::Const(constant) => {
+                format!("{{{}}}", constant.expr)
+            },
+        }
+    }
+
+    fn codify_generic_binding(&self, krate: &types::Crate, binding: &types::TypeBinding) -> String {
+        match &binding.binding {
+            types::TypeBindingKind::Equality(rhs) => {
+                format!("{}={}", &binding.name, &self.codify_type(krate, rhs))
+            }
+            types::TypeBindingKind::Constraint(bounds) => {
+                let str_bounds = bounds
+                    .iter()
+                    .map(|bound| self.codify_generic_bound(krate, bound))
+                    .intersperse(String::from(" + "));
+
+                if bounds.is_empty() {
+                    self.diagnostics
+                        .warning("Generic constraint binding has no bounds?")
+                        .emit();
+                    String::new()
+                } else {
+                    format!("{}: {}", &binding.name, &str_bounds.collect::<String>())
+                }
+            }
+        }
+    }
+
+    fn codify_generic_bound(&self, krate: &types::Crate, bound: &types::GenericBound) -> String {
+        match bound {
+            types::GenericBound::Outlives(lifetime) => lifetime.clone(),
+            types::GenericBound::TraitBound { trait_, generic_params, modifier } => {
+                if let types::TraitBoundModifier::None = modifier {} else {
+                    // FIXME: implement this
+                    self.diagnostics
+                        .warning("Trait bound modifiers are not implemented")
+                        .note(format!("Printing {:?}", modifier))
+                        .emit();
+                };
+
+                if !generic_params.is_empty() {
+                    // FIXME: implement this
+                    self.diagnostics
+                        .warning("Generic parameters are not implemented")
+                        .note(format!("Omitting {} parameters for {:?}", generic_params.len(), trait_))
+                        .emit();
+                }
+
+                self.codify_type(krate, trait_)
+            }
+        }
+    }
+
+    fn name_for_item_at_path(&self, path: &[String]) -> String {
+        path.join("::")
+    }
+
+    fn label_for_item_at_path(&self, path: &[String]) -> String {
+        path.join("-")
+    }
+
+    fn append_header_for_inner_item(
+        &mut self,
+        kind: &str,
+        item: &Item,
+        summary: &types::ItemSummary,
+    ) {
+        let label = self.label_for_item_at_path(&summary.path);
+
+        let header = frontend::Header {
+            label: WithRange(Cow::Owned(label.clone()), (0..0).into()),
+            level: 2,
+        };
+
+        let meta = Self::codify_visibility(&item.visibility);
+        self.buffered.push_back(Event::Start(Tag::Header(header.clone())));
+        self.buffered.push_back(Event::Text({
+            let const_name = self.name_for_item_at_path(&summary.path);
+            Cow::Owned(format!("{} {}{}", kind,  meta, const_name))
+        }));
+        self.buffered.push_back(Event::End(Tag::Header(header.clone())));
+    }
+
+    fn append_impls(
+        &mut self,
+        krate: &types::Crate,
+        item: &Item,
+        impls: &[types::Id],
+    ) {
+        // FIXME: differentiate by kind with headers
+        // let mut intrinsic = vec![];
+        // let mut well_known = vec![];
+        // let mut other_traits = vec![];
+
+        if !impls.is_empty() {
+            self.buffered.push_back(Event::Start(Tag::Paragraph));
+            self.buffered.push_back(Event::Start(Tag::InlineStrong));
+            self.buffered.push_back(Event::Text(Cow::Borrowed("Implementations")));
+            self.buffered.push_back(Event::End(Tag::InlineStrong));
+            self.buffered.push_back(Event::End(Tag::Paragraph));
+        }
+
+        for impl_ in impls.iter().rev() {
+            self.stack.push(Traversal::Item(impl_.clone()));
+        }
+    }
+
+    const RUST_CODE_BLOCK: frontend::CodeBlock<'static> = frontend::CodeBlock {
+        label: None,
+        caption: None,
+        language: Some(WithRange(
+            Cow::Borrowed("rust"),
+            crate::frontend::range::SourceRange {
+                start: 0,
+                end: 0,
+            }
+        )),
+    };
+}
diff --git a/src/frontend/rustdoc/types.rs b/src/frontend/rustdoc/types.rs
new file mode 100644
index 0000000..46b5cbc
--- /dev/null
+++ b/src/frontend/rustdoc/types.rs
@@ -0,0 +1,551 @@
+// Adopted from: rust-lang/rust, c254a15906d6ad64821659b50c4265c96b113159, src/librustdoc/json/types.rs 
+//! Rustdoc's JSON output interface
+//!
+//! These types are the public API exposed through the `--output-format json` flag. The [`Crate`]
+//! struct is the root of the JSON blob and all other items are contained within.
+
+/// Parser cargo metadata json output, format 1.
+#[derive(Deserialize)]
+pub struct WorkspaceMetadata {
+    pub packages: Vec<CrateMetadata>,
+    pub target_directory: String,
+    pub workspace_members: Vec<String>,
+}
+
+#[derive(Deserialize)]
+pub struct CrateMetadata {
+    pub name: String,
+    #[serde(default)]
+    pub version: Option<String>,
+    #[serde(default)]
+    pub description: Option<String>,
+    pub authors: Vec<String>,
+    #[serde(default)]
+    pub readme: Option<String>,
+}
+
+use std::path::PathBuf;
+
+use std::collections::{HashMap, HashSet};
+use serde::Deserialize;
+
+/// A `Crate` is the root of the emitted JSON blob. It contains all type/documentation information
+/// about the language items in the local crate, as well as info about external items to allow
+/// tools to find or link to them.
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+pub struct Crate {
+    /// A single version number to be used in the future when making backwards incompatible changes
+    /// to the JSON output.
+    #[serde(rename = "format_version")]
+    pub _compatible_version: CompatibleVersion,
+    /// The id of the root [`Module`] item of the local crate.
+    pub root: Id,
+    /// The version string given to `--crate-version`, if any.
+    pub crate_version: Option<String>,
+    /// Whether or not the output includes private items.
+    pub includes_private: bool,
+    /// A collection of all items in the local crate as well as some external traits and their
+    /// items that are referenced locally.
+    pub index: HashMap<Id, Item>,
+    /// Maps IDs to fully qualified paths and other info helpful for generating links.
+    pub paths: HashMap<Id, ItemSummary>,
+    /// Maps `crate_id` of items to a crate name and html_root_url if it exists.
+    pub external_crates: HashMap<u32, ExternalCrate>,
+}
+
+#[derive(Clone, Debug, PartialEq)]
+pub struct CompatibleVersion(u32);
+
+impl<'de> Deserialize<'de> for CompatibleVersion {
+    fn deserialize<D: serde::de::Deserializer<'de>>(d: D)
+        -> Result<Self, D::Error>
+    {
+        const NIGHTLY_AT_2021_02_19: u32 = 4;
+        match u32::deserialize(d)? {
+            num @ NIGHTLY_AT_2021_02_19 => Ok(CompatibleVersion(num)),
+            other => {
+                use serde::de::{Error, Unexpected};
+                let unexpected = Unexpected::Unsigned(other.into());
+                Err(D::Error::invalid_value(unexpected, &"the exact version 4"))
+            }
+        }
+    }
+}
+
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+pub struct ExternalCrate {
+    pub name: String,
+    pub html_root_url: Option<String>,
+}
+
+/// For external (not defined in the local crate) items, you don't get the same level of
+/// information. This struct should contain enough to generate a link/reference to the item in
+/// question, or can be used by a tool that takes the json output of multiple crates to find
+/// the actual item definition with all the relevant info.
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+pub struct ItemSummary {
+    /// Can be used to look up the name and html_root_url of the crate this item came from in the
+    /// `external_crates` map.
+    pub crate_id: u32,
+    /// The list of path components for the fully qualified path of this item (e.g.
+    /// `["std", "io", "lazy", "Lazy"]` for `std::io::lazy::Lazy`).
+    pub path: Vec<String>,
+    /// Whether this item is a struct, trait, macro, etc.
+    pub kind: ItemKind,
+}
+
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+pub struct Item {
+    /// The unique identifier of this item. Can be used to find this item in various mappings.
+    pub id: Id,
+    /// This can be used as a key to the `external_crates` map of [`Crate`] to see which crate
+    /// this item came from.
+    pub crate_id: u32,
+    /// Some items such as impls don't have names.
+    pub name: Option<String>,
+    /// The source location of this item (absent if it came from a macro expansion or inline
+    /// assembly).
+    pub source: Option<Span>,
+    /// By default all documented items are public, but you can tell rustdoc to output private items
+    /// so this field is needed to differentiate.
+    pub visibility: Visibility,
+    /// The full markdown docstring of this item. Absent if there is no documentation at all,
+    /// Some("") if there is some documentation but it is empty (EG `#[doc = ""]`).
+    pub docs: Option<String>,
+    /// This mapping resolves [intra-doc links](https://github.com/rust-lang/rfcs/blob/master/text/1946-intra-rustdoc-links.md) from the docstring to their IDs
+    pub links: HashMap<String, Id>,
+    /// Stringified versions of the attributes on this item (e.g. `"#[inline]"`)
+    pub attrs: Vec<String>,
+    pub deprecation: Option<Deprecation>,
+    pub kind: ItemKind,
+    pub inner: ItemEnum,
+}
+
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+pub struct Span {
+    /// The path to the source file for this span relative to the path `rustdoc` was invoked with.
+    pub filename: PathBuf,
+    /// Zero indexed Line and Column of the first character of the `Span`
+    pub begin: (usize, usize),
+    /// Zero indexed Line and Column of the last character of the `Span`
+    pub end: (usize, usize),
+}
+
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+pub struct Deprecation {
+    pub since: Option<String>,
+    pub note: Option<String>,
+}
+
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+#[serde(rename_all = "snake_case")]
+pub enum Visibility {
+    Public,
+    /// For the most part items are private by default. The exceptions are associated items of
+    /// public traits and variants of public enums.
+    Default,
+    Crate,
+    /// For `pub(in path)` visibility. `parent` is the module it's restricted to and `path` is how
+    /// that module was referenced (like `"super::super"` or `"crate::foo::bar"`).
+    Restricted {
+        parent: Id,
+        path: String,
+    },
+}
+
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+#[serde(rename_all = "snake_case")]
+pub enum GenericArgs {
+    /// <'a, 32, B: Copy, C = u32>
+    AngleBracketed { args: Vec<GenericArg>, bindings: Vec<TypeBinding> },
+    /// Fn(A, B) -> C
+    Parenthesized { inputs: Vec<Type>, output: Option<Type> },
+}
+
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+#[serde(rename_all = "snake_case")]
+pub enum GenericArg {
+    Lifetime(String),
+    Type(Type),
+    Const(Constant),
+}
+
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+pub struct Constant {
+    #[serde(rename = "type")]
+    pub type_: Type,
+    pub expr: String,
+    pub value: Option<String>,
+    pub is_literal: bool,
+}
+
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+pub struct TypeBinding {
+    pub name: String,
+    pub binding: TypeBindingKind,
+}
+
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+#[serde(rename_all = "snake_case")]
+pub enum TypeBindingKind {
+    Equality(Type),
+    Constraint(Vec<GenericBound>),
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Hash, Deserialize)]
+pub struct Id(pub String);
+
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+#[serde(rename_all = "snake_case")]
+pub enum ItemKind {
+    Module,
+    ExternCrate,
+    Import,
+    Struct,
+    StructField,
+    Union,
+    Enum,
+    Variant,
+    Function,
+    Typedef,
+    OpaqueTy,
+    Constant,
+    Trait,
+    TraitAlias,
+    Method,
+    Impl,
+    Static,
+    ForeignType,
+    Macro,
+    ProcAttribute,
+    ProcDerive,
+    AssocConst,
+    AssocType,
+    Primitive,
+    Keyword,
+}
+
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+#[serde(untagged)]
+pub enum ItemEnum {
+    ModuleItem(Module),
+    ExternCrateItem {
+        name: String,
+        rename: Option<String>,
+    },
+    ImportItem(Import),
+
+    StructItem(Struct),
+    UnionItem(Union),
+    StructFieldItem(Type),
+    EnumItem(Enum),
+    VariantItem(Variant),
+
+    FunctionItem(Function),
+
+    TraitItem(Trait),
+    TraitAliasItem(TraitAlias),
+    MethodItem(Method),
+    ImplItem(Impl),
+
+    TypedefItem(Typedef),
+    OpaqueTyItem(OpaqueTy),
+    ConstantItem(Constant),
+
+    StaticItem(Static),
+
+    /// `type`s from an extern block
+    ForeignTypeItem,
+
+    /// Declarative macro_rules! macro
+    MacroItem(String),
+    ProcMacroItem(ProcMacro),
+
+    AssocConstItem {
+        #[serde(rename = "type")]
+        type_: Type,
+        /// e.g. `const X: usize = 5;`
+        default: Option<String>,
+    },
+    AssocTypeItem {
+        bounds: Vec<GenericBound>,
+        /// e.g. `type X = usize;`
+        default: Option<Type>,
+    },
+}
+
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+pub struct Module {
+    pub is_crate: bool,
+    pub items: Vec<Id>,
+}
+
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+pub struct Union {
+    pub generics: Generics,
+    pub fields_stripped: bool,
+    pub fields: Vec<Id>,
+    pub impls: Vec<Id>,
+}
+
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+pub struct Struct {
+    pub struct_type: StructType,
+    pub generics: Generics,
+    pub fields_stripped: bool,
+    pub fields: Vec<Id>,
+    pub impls: Vec<Id>,
+}
+
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+pub struct Enum {
+    pub generics: Generics,
+    pub variants_stripped: bool,
+    pub variants: Vec<Id>,
+    pub impls: Vec<Id>,
+}
+
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+#[serde(rename_all = "snake_case")]
+#[serde(tag = "variant_kind", content = "variant_inner")]
+pub enum Variant {
+    Plain,
+    Tuple(Vec<Type>),
+    Struct(Vec<Id>),
+}
+
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+#[serde(rename_all = "snake_case")]
+pub enum StructType {
+    Plain,
+    Tuple,
+    Unit,
+}
+
+#[non_exhaustive]
+#[derive(Clone, Debug, Deserialize, PartialEq, Eq, Hash)]
+#[serde(rename_all = "snake_case")]
+pub enum Qualifiers {
+    Const,
+    Unsafe,
+    Async,
+}
+
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+pub struct Function {
+    pub decl: FnDecl,
+    pub generics: Generics,
+    pub header: HashSet<Qualifiers>,
+    pub abi: String,
+}
+
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+pub struct Method {
+    pub decl: FnDecl,
+    pub generics: Generics,
+    pub header: HashSet<Qualifiers>,
+    pub abi: Option<String>,
+    pub has_body: bool,
+}
+
+#[derive(Clone, Debug, Default, Deserialize, PartialEq)]
+pub struct Generics {
+    pub params: Vec<GenericParamDef>,
+    pub where_predicates: Vec<WherePredicate>,
+}
+
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+pub struct GenericParamDef {
+    pub name: String,
+    pub kind: GenericParamDefKind,
+}
+
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+#[serde(rename_all = "snake_case")]
+pub enum GenericParamDefKind {
+    Lifetime,
+    Type { bounds: Vec<GenericBound>, default: Option<Type> },
+    Const(Type),
+}
+
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+#[serde(rename_all = "snake_case")]
+pub enum WherePredicate {
+    BoundPredicate { ty: Type, bounds: Vec<GenericBound> },
+    RegionPredicate { lifetime: String, bounds: Vec<GenericBound> },
+    EqPredicate { lhs: Type, rhs: Type },
+}
+
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+#[serde(rename_all = "snake_case")]
+pub enum GenericBound {
+    TraitBound {
+        #[serde(rename = "trait")]
+        trait_: Type,
+        /// Used for HRTBs
+        generic_params: Vec<GenericParamDef>,
+        modifier: TraitBoundModifier,
+    },
+    Outlives(String),
+}
+
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+#[serde(rename_all = "snake_case")]
+pub enum TraitBoundModifier {
+    None,
+    Maybe,
+    MaybeConst,
+}
+
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+#[serde(rename_all = "snake_case")]
+#[serde(tag = "kind", content = "inner")]
+pub enum Type {
+    /// Structs, enums, and traits
+    ResolvedPath {
+        name: String,
+        id: Id,
+        args: Option<Box<GenericArgs>>,
+        param_names: Vec<GenericBound>,
+    },
+    /// Parameterized types
+    Generic(String),
+    /// Fixed-size numeric types (plus int/usize/float), char, arrays, slices, and tuples
+    Primitive(String),
+    /// `extern "ABI" fn`
+    FunctionPointer(Box<FunctionPointer>),
+    /// `(String, u32, Box<usize>)`
+    Tuple(Vec<Type>),
+    /// `[u32]`
+    Slice(Box<Type>),
+    /// [u32; 15]
+    Array {
+        #[serde(rename = "type")]
+        type_: Box<Type>,
+        len: String,
+    },
+    /// `impl TraitA + TraitB + ...`
+    ImplTrait(Vec<GenericBound>),
+    /// `!`
+    Never,
+    /// `_`
+    Infer,
+    /// `*mut u32`, `*u8`, etc.
+    RawPointer {
+        mutable: bool,
+        #[serde(rename = "type")]
+        type_: Box<Type>,
+    },
+    /// `&'a mut String`, `&str`, etc.
+    BorrowedRef {
+        lifetime: Option<String>,
+        mutable: bool,
+        #[serde(rename = "type")]
+        type_: Box<Type>,
+    },
+    /// `<Type as Trait>::Name` or associated types like `T::Item` where `T: Iterator`
+    QualifiedPath {
+        name: String,
+        self_type: Box<Type>,
+        #[serde(rename = "trait")]
+        trait_: Box<Type>,
+    },
+}
+
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+pub struct FunctionPointer {
+    pub decl: FnDecl,
+    pub generic_params: Vec<GenericParamDef>,
+    pub header: HashSet<Qualifiers>,
+    pub abi: String,
+}
+
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+pub struct FnDecl {
+    pub inputs: Vec<(String, Type)>,
+    pub output: Option<Type>,
+    pub c_variadic: bool,
+}
+
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+pub struct Trait {
+    pub is_auto: bool,
+    pub is_unsafe: bool,
+    pub items: Vec<Id>,
+    pub generics: Generics,
+    pub bounds: Vec<GenericBound>,
+    pub implementors: Vec<Id>,
+}
+
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+pub struct TraitAlias {
+    pub generics: Generics,
+    pub params: Vec<GenericBound>,
+}
+
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+pub struct Impl {
+    pub is_unsafe: bool,
+    pub generics: Generics,
+    pub provided_trait_methods: Vec<String>,
+    #[serde(rename = "trait")]
+    pub trait_: Option<Type>,
+    #[serde(rename = "for")]
+    pub for_: Type,
+    pub items: Vec<Id>,
+    pub negative: bool,
+    pub synthetic: bool,
+    pub blanket_impl: Option<Type>,
+}
+
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+#[serde(rename_all = "snake_case")]
+pub struct Import {
+    /// The full path being imported.
+    pub span: String,
+    /// May be different from the last segment of `source` when renaming imports:
+    /// `use source as name;`
+    pub name: String,
+    /// The ID of the item being imported.
+    pub id: Option<Id>, // FIXME is this actually ever None?
+    /// Whether this import uses a glob: `use source::*;`
+    pub glob: bool,
+}
+
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+pub struct ProcMacro {
+    pub kind: MacroKind,
+    pub helpers: Vec<String>,
+}
+
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+#[serde(rename_all = "snake_case")]
+pub enum MacroKind {
+    /// A bang macro `foo!()`.
+    Bang,
+    /// An attribute macro `#[foo]`.
+    Attr,
+    /// A derive macro `#[derive(Foo)]`
+    Derive,
+}
+
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+pub struct Typedef {
+    #[serde(rename = "type")]
+    pub type_: Type,
+    pub generics: Generics,
+}
+
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+pub struct OpaqueTy {
+    pub bounds: Vec<GenericBound>,
+    pub generics: Generics,
+}
+
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+pub struct Static {
+    #[serde(rename = "type")]
+    pub type_: Type,
+    pub mutable: bool,
+    pub expr: String,
+}
diff --git a/src/generator/code_gen_units.rs b/src/generator/code_gen_units.rs
index f710a90..9bd0454 100644
--- a/src/generator/code_gen_units.rs
+++ b/src/generator/code_gen_units.rs
@@ -40,7 +40,7 @@ pub enum StackElement<'a, B: Backend<'a>> {
     Graphviz(B::Graphviz),
 
     // resolve context
-    Context(Context, Arc<Diagnostics<'a>>),
+    Context(Context, Arc<Diagnostics<'a>>, i32),
 }
 
 use self::StackElement::*;
diff --git a/src/generator/event.rs b/src/generator/event.rs
index d3c8938..9b04595 100644
--- a/src/generator/event.rs
+++ b/src/generator/event.rs
@@ -22,6 +22,7 @@ pub use crate::frontend::{
     Table,
     TaskListMarker,
     Url,
+    rustdoc::Rustdoc,
 };
 pub use pulldown_cmark::Alignment;
 
@@ -40,6 +41,7 @@ pub enum Event<'a> {
     InlineHtml(Cow<'a, str>),
     Latex(Cow<'a, str>),
     IncludeMarkdown(Box<Events<'a>>),
+    IncludeRustdoc(Box<Rustdoc<'a>>),
     FootnoteReference(FootnoteReference<'a>),
     BiberReferences(Vec<BiberReference<'a>>),
     /// Url without content
@@ -197,7 +199,7 @@ impl<'a> From<FeEvent<'a>> for Event<'a> {
             FeEvent::Url(url) => Event::Url(url),
             FeEvent::InterLink(interlink) => Event::InterLink(interlink),
             FeEvent::Include(_img) => unreachable!("Include is handled by Generator"),
-            FeEvent::ResolveInclude(_include) => {
+            FeEvent::ResolveInclude(_) | FeEvent::SyntheticInclude(..) => {
                 unreachable!("ResolveInclude is handled by Generator")
             },
             FeEvent::Label(label) => Event::Label(label),
diff --git a/src/generator/iter.rs b/src/generator/iter.rs
index 4d0f200..ef594b2 100644
--- a/src/generator/iter.rs
+++ b/src/generator/iter.rs
@@ -1,4 +1,5 @@
 use std::collections::VecDeque;
+use std::borrow::Cow;
 use std::fs;
 use std::io::Write;
 use std::iter::Fuse;
@@ -8,12 +9,15 @@ use crate::diagnostics::Input;
 use crate::error::{Error, FatalResult, Result};
 use crate::frontend::{Event as FeEvent, EventKind as FeEventKind, Frontend, Include as FeInclude, Graphviz};
 use crate::frontend::range::WithRange;
+use crate::frontend::rustdoc::{Crate, Rustdoc};
 use crate::generator::event::{Event, Tag, Image, Pdf, Svg};
 use crate::generator::Generator;
 use crate::resolve::{Include, ContextType, ResolveSecurity};
 
-pub struct Iter<'a> {
-    frontend: Fuse<Frontend<'a>>,
+type FeEvents<'a> = dyn Iterator<Item=WithRange<FeEvent<'a>>> + 'a;
+
+pub struct MarkdownIter<'a> {
+    frontend: Fuse<Box<FeEvents<'a>>>,
     peek: VecDeque<(WithRange<Event<'a>>, FeEventKind)>,
     /// Contains the kind of the last FeEvent returned from `Self::next()`.
     ///
@@ -22,9 +26,27 @@ pub struct Iter<'a> {
     last_kind: FeEventKind,
 }
 
-impl<'a> Iter<'a> {
+enum IncludeSource<'a> {
+    Resolve,
+    Image(FeInclude<'a>),
+    Synthetic {
+        parameter: FeInclude<'a>,
+        source: Cow<'a, str>,
+    },
+}
+
+impl<'a> MarkdownIter<'a> {
     pub fn new(frontend: Frontend<'a>) -> Self {
-        Iter { frontend: frontend.fuse(), peek: VecDeque::new(), last_kind: FeEventKind::Start }
+        let frontend: Box<FeEvents<'a>> = Box::new(frontend);
+        MarkdownIter { frontend: frontend.fuse(), peek: VecDeque::new(), last_kind: FeEventKind::Start }
+    }
+
+    pub fn with_rustdoc(rustdoc: Rustdoc<'a>) -> Self {
+        let frontend: Box<FeEvents<'a>> = Box::new(rustdoc.map(|event| {
+            WithRange(event, (0..0).into())
+        }));
+
+        MarkdownIter { frontend: frontend.fuse(), peek: VecDeque::new(), last_kind: FeEventKind::Start }
     }
 
     /// Retrieves and converts the next event that needs to be handled.
@@ -88,6 +110,7 @@ impl<'a> Iter<'a> {
             | FeEventKind::InterLink
             | FeEventKind::Include
             | FeEventKind::ResolveInclude
+            | FeEventKind::SyntheticInclude
             | FeEventKind::Label
             | FeEventKind::SoftBreak
             | FeEventKind::HardBreak
@@ -117,56 +140,89 @@ impl<'a> Iter<'a> {
         match event {
             FeEvent::Include(image) => {
                 let include = gen.resolve(image.resolve_security, &image.dst, range)?;
-                self.convert_include(WithRange(include, range), Some(image), gen)
+                let source = IncludeSource::Image(image);
+                self.convert_include(WithRange(include, range), source, gen)
             },
             FeEvent::ResolveInclude(include) => {
                 let include = gen.resolve(ResolveSecurity::Default, &include, range)?;
-                self.convert_include(WithRange(include, range), None, gen)
+                self.convert_include(WithRange(include, range), IncludeSource::Resolve, gen)
+            },
+            FeEvent::SyntheticInclude(include, parameter, source) => {
+                let source = IncludeSource::Synthetic { parameter, source };
+                self.convert_include(WithRange(include, range), source, gen)
             },
             e => Ok(e.into()),
         }
     }
 
     fn convert_include(
-        &mut self, WithRange(include, range): WithRange<Include>, image: Option<FeInclude<'a>>,
+        &mut self, WithRange(include, range): WithRange<Include>, source: IncludeSource<'a>,
         gen: &mut Generator<'a, impl Backend<'a>, impl Write>,
     ) -> Result<Event<'a>> {
-        let (label, caption, title, alt_text, scale, width, height) =
-            if let Some(FeInclude {
-                resolve_security: _,
-                label,
-                caption,
-                title,
-                alt_text,
-                dst: _dst,
-                scale,
-                width,
-                height,
-            }) = image
-            {
-                (label, caption, title, alt_text, scale, width, height)
-            } else {
-                Default::default()
+        let mut synthetic_source = None;
+        let (label, caption, title, alt_text, scale, width, height, adjust_headers) =
+            match source {
+                IncludeSource::Image(FeInclude {
+                    resolve_security: _,
+                    label,
+                    caption,
+                    title,
+                    alt_text,
+                    dst: _dst,
+                    scale,
+                    width,
+                    height,
+                    adjust_headers,
+                }) => {
+                    (label, caption, title, alt_text, scale, width, height, adjust_headers)
+                },
+                IncludeSource::Synthetic {
+                    parameter: FeInclude {
+                        resolve_security: _,
+                        label,
+                        caption,
+                        title,
+                        alt_text,
+                        dst: _dst,
+                        scale,
+                        width,
+                        height,
+                        adjust_headers,
+                    },
+                    source,
+                } => {
+                    synthetic_source = Some(source);
+                    (label, caption, title, alt_text, scale, width, height, adjust_headers)
+                },
+                IncludeSource::Resolve => {
+                    Default::default()
+                },
             };
         match include {
             Include::Command(command) => Ok(command.into()),
             Include::Markdown(path, context) => {
-                let markdown = fs::read_to_string(&path).map_err(|err| {
-                    gen.diagnostics()
-                        .error("error reading markdown include file")
-                        .with_error_section(range, "in this include")
-                        .error(format!("cause: {}", err))
-                        .note(format!("reading from path {}", path.display()))
-                        .emit();
-                    Error::Diagnostic
-                })?;
+                let markdown = if let Some(markdown) = synthetic_source {
+                    markdown
+                } else {
+                    let source = fs::read_to_string(&path).map_err(|err| {
+                        gen.diagnostics()
+                            .error("error reading markdown include file")
+                            .with_error_section(range, "in this include")
+                            .error(format!("cause: {}", err))
+                            .note(format!("reading from path {}", path.display()))
+                            .emit();
+                        Error::Diagnostic
+                    })?;
+                    Cow::Owned(source)
+                };
                 let input = match context.typ() {
                     ContextType::Remote => Input::Url(context.url().clone()),
                     ContextType::LocalRelative | ContextType::LocalAbsolute => {
                         Input::File(path)
                     },
                 };
-                let events = gen.get_events(markdown, context, input);
+                let mut events = gen.get_events(markdown, context, input);
+                events.adjust_header_levels = adjust_headers;
                 Ok(Event::IncludeMarkdown(Box::new(events)))
             },
             Include::Image(path) => {
@@ -181,6 +237,10 @@ impl<'a> Iter<'a> {
                     height,
                 }))
             },
+            Include::Rustdoc(path, context) => {
+                let events = gen.get_rustdoc(Crate::Local(path), context)?;
+                Ok(Event::IncludeRustdoc(Box::new(events)))
+            },
             Include::Svg(path) => {
                 Ok(Event::Svg(Svg {
                     label,
diff --git a/src/generator/mod.rs b/src/generator/mod.rs
index 877489d..8703f33 100644
--- a/src/generator/mod.rs
+++ b/src/generator/mod.rs
@@ -1,3 +1,4 @@
+use std::borrow::Cow;
 use std::fmt;
 use std::fs;
 use std::io::Write;
@@ -9,8 +10,9 @@ use codespan_reporting::termcolor::StandardStream;
 use crate::backend::{Backend, StatefulCodeGenUnit};
 use crate::config::{Config, FileOrStdio};
 use crate::diagnostics::{Diagnostics, Input};
-use crate::frontend::Frontend;
+use crate::frontend::{Frontend, Tag};
 use crate::frontend::range::{SourceRange, WithRange};
+use crate::frontend::rustdoc::{Crate, Rustdoc};
 use crate::resolve::{Context, Include, Resolver, ResolveSecurity};
 
 mod code_gen_units;
@@ -23,7 +25,7 @@ pub use self::stack::Stack;
 use self::code_gen_units::StackElement;
 use self::event::Event;
 use crate::error::{Error, FatalResult, Result};
-use crate::generator::iter::Iter;
+use crate::generator::iter::MarkdownIter;
 
 pub struct Generator<'a, B: Backend<'a>, W: Write> {
     arena: &'a Arena<String>,
@@ -34,18 +36,22 @@ pub struct Generator<'a, B: Backend<'a>, W: Write> {
     resolver: Resolver,
     template: Option<String>,
     stderr: Arc<Mutex<StandardStream>>,
+    header_level_adjustment: i32,
+    latest_header_level: i32,
 }
 
 pub struct Events<'a> {
-    events: Iter<'a>,
+    events: MarkdownIter<'a>,
     diagnostics: Arc<Diagnostics<'a>>,
     context: Context,
+    /// Whether to generate all events with an adjusted header level.
+    adjust_header_levels: bool,
 }
 
 impl<'a> fmt::Debug for Events<'a> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         f.debug_struct("Events")
-            .field("events", &"Iter")
+            .field("events", &"MarkdownIter")
             .field("diagnostics", &self.diagnostics)
             .field("context", &self.context)
             .finish()
@@ -67,18 +73,29 @@ impl<'a, B: Backend<'a>, W: Write> Generator<'a, B, W> {
             cfg,
             default_out,
             stack: Vec::new(),
-            resolver: Resolver::new(cfg.project_root.clone(), cfg.document_folder.clone(), cfg.temp_dir.clone()),
+            resolver: Resolver::new(cfg.project_root.clone(), cfg.document_folder.clone(), cfg.cache_dir.clone()),
             template,
             stderr,
+            header_level_adjustment: 0,
+            latest_header_level: 0 
         }
     }
 
-    pub fn get_events(&mut self, markdown: String, context: Context, input: Input) -> Events<'a> {
-        let markdown = self.arena.alloc(markdown);
+    pub fn get_events(&mut self, markdown: Cow<'a, str>, context: Context, input: Input) -> Events<'a> {
+        let markdown = match markdown {
+            Cow::Owned(markdown) => self.arena.alloc(markdown),
+            Cow::Borrowed(borrowed) => borrowed,
+        };
         let diagnostics = Arc::new(Diagnostics::new(markdown, input, Arc::clone(&self.stderr)));
         let frontend = Frontend::new(self.cfg, markdown, Arc::clone(&diagnostics));
-        let events = Iter::new(frontend);
-        Events { events, diagnostics, context }
+        let events = MarkdownIter::new(frontend);
+        Events { events, diagnostics, context, adjust_header_levels: false }
+    }
+
+    pub fn get_rustdoc(&mut self, target: Crate, context: Context) -> FatalResult<Rustdoc<'a>> {
+        let target = target.generate(self.diagnostics())?;
+        let diagnostics = Arc::new(Diagnostics::new("", Input::Stdin, Arc::clone(&self.stderr)));
+        Ok(Rustdoc::new(self.cfg, target, diagnostics, context))
     }
 
     pub fn generate(&mut self, markdown: String) -> FatalResult<()> {
@@ -88,7 +105,7 @@ impl<'a, B: Backend<'a>, W: Write> Generator<'a, B, W> {
             FileOrStdio::File(path) => Input::File(path.clone()),
             FileOrStdio::StdIo => Input::Stdin,
         };
-        let events = self.get_events(markdown, context, input);
+        let events = self.get_events(markdown.into(), context, input);
         if let Some(template) = self.template.take() {
             let body_index =
                 template.find("\nHERADOCBODY\n").expect("HERADOCBODY not found in template");
@@ -106,9 +123,45 @@ impl<'a, B: Backend<'a>, W: Write> Generator<'a, B, W> {
     }
 
     pub fn generate_body(&mut self, events: Events<'a>) -> FatalResult<()> {
-        self.stack.push(StackElement::Context(events.context, events.diagnostics));
-        let mut events = events.events;
+        // Store the level adjustment.
+        let context = StackElement::Context(events.context, events.diagnostics, self.header_level_adjustment);
+
+        self.header_level_adjustment = self.latest_header_level;
+        self.generate_markdown_in(events.events, context)?;
+
+        Ok(())
+    }
+
+    pub fn generate_rustdoc(&mut self, events: Rustdoc<'a>) -> FatalResult<()> {
+        // TODO: we should push some context..
+        let context = StackElement::Context(
+            events.context().clone(),
+            events.diagnostics(),
+            self.header_level_adjustment);
+        self.generate_markdown_in(MarkdownIter::with_rustdoc(events), context)?;
+
+        Ok(())
+    }
+
+    fn generate_markdown_in(&mut self, events: MarkdownIter<'a>, context: StackElement<'a, B>) -> FatalResult<()> {
+        self.stack.push(context);
 
+        self.generate_markdown(events)?;
+
+        match self.stack.pop() {
+            Some(StackElement::Context(_, _, header_level_adjustment)) => {
+                self.header_level_adjustment = header_level_adjustment;
+            },
+            element => panic!(
+                "Expected context as stack element after body generation is finished, got {:?}",
+                element
+            ),
+        }
+
+        Ok(())
+    }
+
+    fn generate_markdown(&mut self, mut events: MarkdownIter<'a>) -> FatalResult<()> {
         while let Some(WithRange(event, range)) = events.next(self)? {
             let peek = events.peek(self)?;
             match self.visit_event(WithRange(event, range), self.cfg, peek) {
@@ -117,13 +170,6 @@ impl<'a, B: Backend<'a>, W: Write> Generator<'a, B, W> {
                 Err(Error::Fatal(fatal)) => return Err(fatal),
             }
         }
-        match self.stack.pop() {
-            Some(StackElement::Context(..)) => (),
-            element => panic!(
-                "Expected context as stack element after body generation is finished, got {:?}",
-                element
-            ),
-        }
         Ok(())
     }
 
@@ -140,6 +186,10 @@ impl<'a, B: Backend<'a>, W: Write> Generator<'a, B, W> {
         match event {
             Event::End(_) => unreachable!(),
             Event::Start(tag) => {
+                let tag = self.adjust_tag_from_context(tag);
+                if let Tag::Header(header) = &tag {
+                    self.latest_header_level = header.level;
+                }
                 let state = StackElement::new(self.cfg, WithRange(tag, range), self)?;
                 self.stack.push(state);
             },
@@ -148,6 +198,7 @@ impl<'a, B: Backend<'a>, W: Write> Generator<'a, B, W> {
             Event::InlineHtml(html) => B::Text::new(config, WithRange(html, range), self)?.finish(self, peek)?,
             Event::Latex(latex) => B::Latex::new(config, WithRange(latex, range), self)?.finish(self, peek)?,
             Event::IncludeMarkdown(events) => self.generate_body(*events)?,
+            Event::IncludeRustdoc(events) => self.generate_rustdoc(*events)?,
             Event::FootnoteReference(fnote) => {
                 B::FootnoteReference::new(config, WithRange(fnote, range), self)?.finish(self, peek)?
             },
@@ -177,6 +228,16 @@ impl<'a, B: Backend<'a>, W: Write> Generator<'a, B, W> {
         Ok(())
     }
 
+    /// Adjust the tag based on the context of this potentially included file within the full
+    /// document.
+    fn adjust_tag_from_context(&mut self, mut tag: Tag<'a>) -> Tag<'a> {
+        if let Tag::Header(header) = &mut tag {
+            header.level += self.header_level_adjustment;
+        }
+
+        tag
+    }
+
     pub fn stack(&mut self) -> Stack<'a, '_, B, W> {
         Stack::new(&mut self.default_out, &mut self.stack)
     }
@@ -199,7 +260,7 @@ impl<'a, B: Backend<'a>, W: Write> Generator<'a, B, W> {
         for state in self.stack.iter_mut().rev() {
             if context.is_none() {
                 match state {
-                    StackElement::Context(ctx, diagnostics) => context = Some((ctx, diagnostics)),
+                    StackElement::Context(ctx, diagnostics, _) => context = Some((ctx, diagnostics)),
                     _ => (),
                 }
             } else if out.is_none() {
diff --git a/src/generator/stack.rs b/src/generator/stack.rs
index b030e66..857e629 100644
--- a/src/generator/stack.rs
+++ b/src/generator/stack.rs
@@ -32,7 +32,7 @@ impl<'a: 'b, 'b, B: Backend<'a> + 'b, W: Write> Stack<'a, 'b, B, W> {
             .iter_mut()
             .rev()
             .filter_map(|state| match state {
-                StackElement::Context(_, diagnostics) => Some(diagnostics),
+                StackElement::Context(_, diagnostics, _) => Some(diagnostics),
                 _ => None,
             })
             .next()
diff --git a/src/main.rs b/src/main.rs
index b563764..d3c60e1 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -108,7 +108,7 @@ fn main() {
         }
         None => FileConfig::default(),
     };
-    let tmpdir = TempDir::new("heradoc").expect("can't create tempdir");
+    let tmpdir = std::mem::ManuallyDrop::new(TempDir::new("heradoc").expect("can't create tempdir"));
     let cfg = Config::new(args, infile, file, cfgfile_folder, &tmpdir);
     if cfg.out_dir != cfg.temp_dir {
         // While initializing the config, some files may already be downloaded.
@@ -165,6 +165,10 @@ fn gen_latex(cfg: &Config, markdown: String, out: impl Write) {
             OutType::Pdf | OutType::Latex => backend::generate(cfg, Beamer::new(), &Arena::new(), markdown, out, stderr),
             OutType::Mp4 => backend::generate(cfg, SlidesFfmpegEspeak::new(), &Arena::new(), markdown, out, stderr),
         },
+        DocumentType::RustDoc => {
+            let input = markdown;
+            backend::generate_rust_docs(cfg, Report::new(), &Arena::new(), input, out, stderr)
+        }
         DocumentType::Report => backend::generate(cfg, Report::new(), &Arena::new(), markdown, out, stderr),
         DocumentType::Thesis => backend::generate(cfg, Thesis::new(), &Arena::new(), markdown, out, stderr),
     };
diff --git a/src/resolve/include.rs b/src/resolve/include.rs
index 5d37924..6e86a29 100644
--- a/src/resolve/include.rs
+++ b/src/resolve/include.rs
@@ -8,7 +8,7 @@ use url::{Url, ParseError};
 use super::BASE_URL;
 
 /// Represents the current context we're including from
-#[derive(Debug, PartialEq, Eq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct Context {
     /// Full URL to the file / content
     ///
@@ -84,6 +84,7 @@ pub enum Include {
     Svg(PathBuf),
     Pdf(PathBuf),
     Graphviz(PathBuf),
+    Rustdoc(PathBuf, Context),
 }
 
 /// A direct command to the generator.
diff --git a/src/resolve/target.rs b/src/resolve/target.rs
index 594e724..1755975 100644
--- a/src/resolve/target.rs
+++ b/src/resolve/target.rs
@@ -73,6 +73,17 @@ enum TargetInner {
     ///
     /// Ex: `![](https://foo.bar/baz.md)`
     Remote(Url),
+    /// An URL with the custom rustdoc scheme.
+    ///
+    /// There must be a cargo project and a `Cargo.toml` at the target directory. It will point to
+    /// the first crate in the workspace for now. Planned is to use the domain for selecting the
+    /// target crate in the future, including maybe retrieving a particular version from the
+    /// registry?
+    ///
+    /// Ex: `![](rustdoc:/path/to/Cargo.toml)`
+    Rustdoc(PathBuf),
+    /// An URL with rustdoc scheme but relative to our workspace.
+    RustdocRelative(PathBuf),
 }
 
 impl<'a, 'd> Target<'a, 'd> {
@@ -111,6 +122,53 @@ impl<'a, 'd> Target<'a, 'd> {
                     return Err(Error::Diagnostic);
                 }
             },
+            "rustdoc" => match url.host_str() {
+                None => {
+                    match context.url.join(url.path()) {
+                        Ok(url) => TargetInner::RustdocRelative(url.path_segments().unwrap().collect()),
+                        Err(err) => {// There is no extra information.
+                            diagnostics
+                                .error("error interpreting relative file path of rustdoc source")
+                                .with_info_section(range, "defined here")
+                                .note(format!("malformed reference: {}", err))
+                                .emit();
+                            return Err(Error::Diagnostic);
+                        }
+                    }
+                }
+                Some("") => {
+                    let mut url = url.clone();
+                    // There are a few special cases for file:
+                    // We want to use them here as well.
+                    // url.set_host(None);
+                    url.set_scheme("file")
+                        .expect("Can update to file scheme because rustdoc is not a special scheme.");
+                    // !!! FIXME: Workaround for https://github.com/servo/rust-url/issues/553
+                    // For some reason an internal state is not updated so we still have
+                    // inconsistent information referring to a remote.
+                    let url = Url::parse(url.as_str())
+                        .expect("Roundtrip with updated host");
+                    match url.to_file_path() {
+                        Ok(path) => TargetInner::Rustdoc(path),
+                        Err(()) => {
+                            diagnostics
+                                .error("error converting path to cargo project")
+                                .with_info_section(range, "defined here")
+                                .help("this could be due to a malformed path")
+                                .emit();
+                            return Err(Error::Diagnostic);
+                        }
+                    }
+                }
+                Some(domain) => {
+                    diagnostics
+                        .error("rustdoc URLs must not provide a domain")
+                        .with_error_section(range, "defined here")
+                        .note(format!("uses the domain `{}`", domain))
+                        .emit();
+                    return Err(Error::Diagnostic);
+                }
+            },
             "file" => match url.to_file_path() {
                 Ok(path) => TargetInner::LocalAbsolute(path),
                 Err(()) => {
@@ -160,6 +218,11 @@ impl<'a, 'd> Target<'a, 'd> {
             inner @ TargetInner::Implementation(_) => inner,
             inner @ TargetInner::Remote(_) => inner,
             TargetInner::LocalAbsolute(abs) => TargetInner::LocalAbsolute(canonicalize(abs)?),
+            TargetInner::Rustdoc(abs) => TargetInner::Rustdoc(canonicalize(abs)?),
+            TargetInner::RustdocRelative(rel) => {
+                assert!(rel.is_relative(), "TargetInner::RustdocRelative not relative before canonicalizing: {:?}", rel);
+                TargetInner::RustdocRelative(canonicalize(meta.project_root.join(rel))?)
+            },
             TargetInner::LocalDocumentRelative(rel) => {
                 assert!(rel.is_relative(), "TargetInner::LocalDocumentRelative not relative before canonicalizing: {:?}", rel);
                 TargetInner::LocalDocumentRelative(canonicalize(meta.document_root.join(rel))?)
@@ -197,12 +260,16 @@ impl <'a, 'd> TargetCanonicalized<'a, 'd> {
             (ContextType::LocalRelative, TargetInner::Implementation(_))
             | (ContextType::LocalRelative, TargetInner::LocalProjectRelative(_))
             | (ContextType::LocalRelative, TargetInner::LocalDocumentRelative(_))
-            | (ContextType::LocalRelative, TargetInner::Remote(_)) => (),
+            | (ContextType::LocalRelative, TargetInner::Remote(_))
+            | (ContextType::LocalRelative, TargetInner::Rustdoc(_))
+            | (ContextType::LocalRelative, TargetInner::RustdocRelative(_)) => (),
 
             (ContextType::LocalAbsolute, TargetInner::Implementation(_)) => (),
             (ContextType::LocalAbsolute, TargetInner::LocalProjectRelative(_))
             | (ContextType::LocalAbsolute, TargetInner::LocalDocumentRelative(_))
-            | (ContextType::LocalAbsolute, TargetInner::Remote(_)) => {
+            | (ContextType::LocalAbsolute, TargetInner::Remote(_)) 
+            | (ContextType::LocalAbsolute, TargetInner::Rustdoc(_)) 
+            | (ContextType::LocalAbsolute, TargetInner::RustdocRelative(_)) => {
                 meta.diagnostics
                     .error("permission denied")
                     .with_error_section(meta.range, "trying to include this")
@@ -337,6 +404,9 @@ impl<'a, 'd> TargetChecked<'a, 'd> {
                     None => to_include(path, context, meta.range, meta.diagnostics),
                 }
             },
+            TargetInner::Rustdoc(path) | TargetInner::RustdocRelative(path) => {
+                Ok(Include::Rustdoc(path, Context::from_url(meta.url)))
+            },
         }
     }
 }
diff --git a/src/resolve/tests.rs b/src/resolve/tests.rs
index c1613ed..57e84e5 100644
--- a/src/resolve/tests.rs
+++ b/src/resolve/tests.rs
@@ -54,6 +54,7 @@ fn prepare() -> (TempDir, SourceRange, Resolver, Diagnostics<'static>) {
     let _ = File::create(tmpdir.path().join("chapters/chapter2.md")).expect("Can't create chapters/chapter2.md");
     let _ = File::create(tmpdir.path().join("images/image.png")).expect("Can't create images/image.png");
     fs::create_dir(tmpdir.path().join("downloads")).expect("can't create downloads directory");
+    fs::create_dir(tmpdir.path().join("crate")).expect("can't create crate directory");
     let range = SourceRange { start: 0, end: 0 };
     let diagnostics = Diagnostics::new("", Input::Stdin, Arc::new(Mutex::new(StandardStream::stderr(ColorChoice::Auto))));
     let resolver = Resolver::new(tmpdir.path().to_owned(), tmpdir.path().join("chapters"), tmpdir.path().join("download"));
@@ -254,6 +255,29 @@ fn commands() {
     assert_match!(listings, Include::Command(Command::ListOfListings));
 }
 
+#[test]
+fn rustdoc() {
+    let (project_root, range, resolver, diagnostics) = prepare();
+    let ctx = Context::from_path("chapters/").expect("can't create context");
+    let abs_path = project_root.path().join("crate");
+
+    let relative = resolver
+        .resolve(ResolveSecurity::Default, &ctx, "rustdoc:../crate", range, &diagnostics)
+        .expect("Success resolving `rustdoc:../crate`");
+    let project = resolver
+        .resolve(ResolveSecurity::Default, &ctx, "rustdoc:/crate", range, &diagnostics)
+        .expect("Success resolving `rustdoc:/crate`");
+
+    let absolute = format!("rustdoc://{}", abs_path.display());
+    let absolute = resolver
+        .resolve(ResolveSecurity::Default, &ctx, &absolute, range, &diagnostics)
+        .expect("Success resolving `rustdoc:///path/crate`");
+
+    assert_match!(relative, Include::Rustdoc(path) if *path == abs_path);
+    assert_match!(project, Include::Rustdoc(path) if *path == abs_path);
+    assert_match!(absolute, Include::Rustdoc(path) if *path == abs_path);
+}
+
 #[test]
 fn http_resolves_needs_internet() {
     let (_project_root, range, resolver, diagnostics) = prepare();