Update Rust version in Dockerfile to actually work

dockerfile → Dockerfile

@@ -1,4 +1,4 @@
-FROM rust:1.54
+FROM rust:1.74
 
 WORKDIR /usr/src/myapp
 COPY . .

crates/dmdoc/src/main.rs

@@ -718,7 +718,7 @@ fn main2() -> Result<(), Box<dyn std::error::Error>> {
 }
 
 fn find_return_type(code: &dm::ast::Block) -> Option<Vec<String>> {
-    for stmt in code {
+    for stmt in code.iter() {
         if let dm::ast::Statement::Setting { name, mode: dm::ast::SettingMode::Assign, value } = &stmt.elem {
             if name.as_str() == "SpacemanDMM_return_type" {
                 if let Some(dm::ast::Term::Prefab(fab)) = value.as_term() {

crates/dmdoc/src/template.rs

@@ -84,10 +84,12 @@ fn teaser(block: &DocBlock, prefix: &str) -> Markup {
 }
 
 fn git_link(env: &Environment, file: &str, line: u32) -> Markup {
+    let z;
     let title = if line == 0 {
         file
     } else {
-        &format!("{} {}", file, line)
+        z = format!("{} {}", file, line);
+        &z
     };
     let icon = html! {
         img src="git.png" width="16" height="16" title=(title);