diff --git a/examples/group/src/main.rs b/examples/group/src/main.rs
index 163e0f3..eb9f86b 100644
--- a/examples/group/src/main.rs
+++ b/examples/group/src/main.rs
@@ -1,4 +1,3 @@
-#![feature(proc_macro_hygiene)]
 #![warn(rust_2018_idioms)]
 
 use pear::macros::{parser, switch, parse};
diff --git a/examples/ini/src/main.rs b/examples/ini/src/main.rs
index cdbb650..805d9af 100644
--- a/examples/ini/src/main.rs
+++ b/examples/ini/src/main.rs
@@ -1,4 +1,3 @@
-#![feature(proc_macro_hygiene)]
 #![warn(rust_2018_idioms)]
 
 use std::fmt;
diff --git a/examples/json/src/main.rs b/examples/json/src/main.rs
index d004282..a105af9 100644
--- a/examples/json/src/main.rs
+++ b/examples/json/src/main.rs
@@ -1,4 +1,3 @@
-#![feature(proc_macro_hygiene)]
 #![warn(rust_2018_idioms)]
 
 use std::collections::HashMap;
diff --git a/examples/parens/src/main.rs b/examples/parens/src/main.rs
index beb247f..1b307a5 100644
--- a/examples/parens/src/main.rs
+++ b/examples/parens/src/main.rs
@@ -1,4 +1,3 @@
-#![feature(proc_macro_hygiene)]
 #![warn(rust_2018_idioms)]
 
 use pear::input::{Text, Result};
diff --git a/lib/src/input/string.rs b/lib/src/input/string.rs
index 1e64486..0c74d41 100644
--- a/lib/src/input/string.rs
+++ b/lib/src/input/string.rs
@@ -1,7 +1,5 @@
 pub use crate::input::{Input, Token, Slice, ParserInfo};
 
-impl<'a, 'b: 'a> Slice<&'a str> for &'b str { }
-
 // ident_impl_token!(&str);
 
 impl<'a> Input for &'a str {
diff --git a/lib/src/input/text.rs b/lib/src/input/text.rs
index 38c8d63..6212687 100644
--- a/lib/src/input/text.rs
+++ b/lib/src/input/text.rs
@@ -42,8 +42,6 @@ impl<'a> From<&'a str> for Text<'a> {
     }
 }
 
-impl<'a, 'b> Slice<Text<'a>> for &'b str { }
-
 // ident_impl_token!(Text<'_>);
 
 impl Rewind for Text<'_> {
diff --git a/lib/src/lib.rs b/lib/src/lib.rs
index 27b9615..70053b4 100644
--- a/lib/src/lib.rs
+++ b/lib/src/lib.rs
@@ -1,6 +1,3 @@
-#![feature(proc_macro_hygiene)]
-#![feature(specialization)]
-
 #![warn(rust_2018_idioms)]
 
 #[macro_use] pub mod macros;
diff --git a/lib/tests/parsers.rs b/lib/tests/parsers.rs
index 833a13c..0058f4c 100644
--- a/lib/tests/parsers.rs
+++ b/lib/tests/parsers.rs
@@ -11,7 +11,7 @@ fn take_until_str<'a>(input: &mut Text<'a>, s: &str) -> Result<'a, &'a str> {
 }
 
 #[parser]
-fn test_until<'a>(input: &mut Text<'a>, s: &str, r: &str) -> Result<'a, &'a str> {
+fn test_until<'a>(input: &mut Text<'a>, s: &str, r: &'a str) -> Result<'a, &'a str> {
     (take_until_str(s)?, eat_slice(r)?).0
 }
 
@@ -43,7 +43,7 @@ fn take_until_and_str<'a>(input: &mut Text<'a>, s: &str) -> Result<'a, &'a str>
 }
 
 #[parser]
-fn test_until_and<'a>(input: &mut Text<'a>, s: &str, r: &str) -> Result<'a, &'a str> {
+fn test_until_and<'a>(input: &mut Text<'a>, s: &'a str, r: &'a str) -> Result<'a, &'a str> {
     (take_until_and_str(s)?, eat_slice(r)?).0
 }
 
@@ -69,7 +69,7 @@ fn test_while_slice_and() {
 }
 
 #[parser]
-fn test_until_window<'a>(input: &mut Text<'a>, s: &str, r: &str) -> Result<'a, &'a str> {
+fn test_until_window<'a>(input: &mut Text<'a>, s: &'a str, r: &'a str) -> Result<'a, &'a str> {
     (take_until_slice(s)?, eat_slice(r)?).0
 }