check rustdoc links

Author: jyn514

src/librustdoc/Cargo.toml

@@ -22,15 +22,13 @@ tempfile = "3"
 thin-vec = "0.2.9"
 tracing = "0.1"
 tracing-tree = "0.2.0"
+rayon = "1.5.1"
 
 [dependencies.tracing-subscriber]
 version = "0.3.3"
 default-features = false
 features = ["fmt", "env-filter", "smallvec", "parking_lot", "ansi"]
 
-[target.'cfg(windows)'.dependencies]
-rayon = "1.5.1"
-
 [dependencies.cargo-deadlinks]
 git = "https://github.com/jyn514/cargo-deadlinks/"
 branch = "http-feature"

src/librustdoc/html/render/context.rs

@@ -168,6 +168,17 @@ impl<'tcx> Context<'tcx> {
         "../".repeat(self.current.len())
     }
 
+    fn check_dead_links(&mut self) {
+        use cargo_deadlinks::*;
+        use rayon::iter::ParallelIterator;
+
+        let path = self.dst.canonicalize().unwrap();
+        let errors: Vec<_> = unavailable_urls(&path, &CheckContext::default()).collect();
+        for err in errors {
+            self.sess().struct_warn(&err.to_string().replace('\t', "    ")).emit();
+        }
+    }
+
     fn render_item(&mut self, it: &clean::Item, is_module: bool) -> String {
         let mut title = String::new();
         if !is_module {
@@ -708,6 +719,8 @@ impl<'tcx> FormatRenderer<'tcx> for Context<'tcx> {
         // No need for it anymore.
         drop(shared);
 
+        self.check_dead_links();
+
         // Flush pending errors.
         Rc::get_mut(&mut self.shared).unwrap().fs.close();
         let nb_errors =