rustdoc: Add support for local resources

src/librustdoc/html/markdown.rs

@@ -103,13 +103,13 @@ pub struct Markdown<'a> {
     pub heading_offset: HeadingOffset,
 }
 /// A tuple struct like `Markdown` that renders the markdown with a table of contents.
-pub(crate) struct MarkdownWithToc<'a>(
-    pub(crate) &'a str,
-    pub(crate) &'a mut IdMap,
-    pub(crate) ErrorCodes,
-    pub(crate) Edition,
-    pub(crate) &'a Option<Playground>,
-);
+pub(crate) struct MarkdownWithToc<'a> {
+    pub(crate) content: &'a str,
+    pub(crate) ids: &'a mut IdMap,
+    pub(crate) error_codes: ErrorCodes,
+    pub(crate) edition: Edition,
+    pub(crate) playground: &'a Option<Playground>,
+}
 /// A tuple struct like `Markdown` that renders the markdown escaping HTML tags
 /// and includes no paragraph tags.
 pub(crate) struct MarkdownItemInfo<'a>(pub(crate) &'a str, pub(crate) &'a mut IdMap);
@@ -1048,7 +1048,7 @@ impl Markdown<'_> {
 
 impl MarkdownWithToc<'_> {
     pub(crate) fn into_string(self) -> String {
-        let MarkdownWithToc(md, ids, codes, edition, playground) = self;
+        let MarkdownWithToc { content: md, ids, error_codes: codes, edition, playground } = self;
 
         let p = Parser::new_ext(md, main_body_opts()).into_offset_iter();
 

src/librustdoc/markdown.rs

@@ -72,7 +72,14 @@ pub(crate) fn render<P: AsRef<Path>>(
     let mut ids = IdMap::new();
     let error_codes = ErrorCodes::from(options.unstable_features.is_nightly_build());
     let text = if !options.markdown_no_toc {
-        MarkdownWithToc(text, &mut ids, error_codes, edition, &playground).into_string()
+        MarkdownWithToc {
+            content: text,
+            ids: &mut ids,
+            error_codes,
+            edition,
+            playground: &playground,
+        }
+        .into_string()
     } else {
         Markdown {
             content: text,