(rustdoc) [src] link for types defined by macros shows invocation

Previously the [src] link on types defined by a macro
pointed to the macro definition.
This commit makes the Clean-Implementation for Spans
aware of macro defined types,
so that the link points to the invocation instead.

src/librustdoc/clean/mod.rs

@@ -1967,18 +1967,23 @@ impl Clean<Span> for rustc_span::Span {
             return Span::empty();
         }
 
+        // Get the macro invocation instead of the definition,
+        // in case the span is result of a macro expansion.
+        // (See rust-lang/rust#39726)
+        let span = self.source_callsite();
+
         let sm = cx.sess().source_map();
-        let filename = sm.span_to_filename(*self);
-        let lo = sm.lookup_char_pos(self.lo());
-        let hi = sm.lookup_char_pos(self.hi());
+        let filename = sm.span_to_filename(span);
+        let lo = sm.lookup_char_pos(span.lo());
+        let hi = sm.lookup_char_pos(span.hi());
         Span {
             filename,
             cnum: lo.file.cnum,
             loline: lo.line,
             locol: lo.col.to_usize(),
             hiline: hi.line,
             hicol: hi.col.to_usize(),
-            original: *self,
+            original: span,
         }
     }
 }

src/test/rustdoc/external-macro-src.rs

@@ -1,15 +1,12 @@
 // aux-build:external-macro-src.rs
-// ignore-tidy-linelength
 
 #![crate_name = "foo"]
 
 #[macro_use]
 extern crate external_macro_src;
 
-// @has foo/index.html '//a[@href="../src/foo/external-macro-src.rs.html#4-15"]' '[src]'
+// @has foo/index.html '//a[@href="../src/foo/external-macro-src.rs.html#3-12"]' '[src]'
 
 // @has foo/struct.Foo.html
-// @has - '//a[@href="https://example.com/src/external_macro_src/external-macro-src.rs.html#8"]' '[src]'
-// @has - '//a[@href="https://example.com/src/external_macro_src/external-macro-src.rs.html#9-13"]' '[src]'
-// @has - '//a[@href="https://example.com/src/external_macro_src/external-macro-src.rs.html#10-12"]' '[src]'
+// @has - '//a[@href="../src/foo/external-macro-src.rs.html#12"]' '[src]'
 make_foo!();

src/test/rustdoc/issue-26606.rs

@@ -7,5 +7,5 @@
 extern crate issue_26606_macro;
 
 // @has issue_26606/constant.FOO.html
-// @has - '//a/@href' '../src/issue_26606_macro/issue-26606-macro.rs.html#3'
+// @has - '//a[@href="../src/issue_26606/issue-26606.rs.html#11"]' '[src]'
 make_item!(FOO);

src/test/rustdoc/thread-local-src.rs

@@ -2,5 +2,5 @@
 
 // @has foo/index.html '//a[@href="../src/foo/thread-local-src.rs.html#1-6"]' '[src]'
 
-// @has foo/constant.FOO.html '//a/@href' 'https://doc.rust-lang.org/nightly/src/std/'
+// @has foo/constant.FOO.html '//a[@href="../src/foo/thread-local-src.rs.html#6"]' '[src]'
 thread_local!(pub static FOO: bool = false);