rustdoc: Don't crash on crate references in blocks

compiler/rustc_resolve/src/lib.rs

@@ -1849,20 +1849,12 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
         &mut self,
         path_str: &str,
         ns: Namespace,
-        mut parent_scope: ParentScope<'a>,
+        parent_scope: ParentScope<'a>,
     ) -> Option<Res> {
         let mut segments =
             Vec::from_iter(path_str.split("::").map(Ident::from_str).map(Segment::from_ident));
         if let Some(segment) = segments.first_mut() {
-            if segment.ident.name == kw::Crate {
-                // FIXME: `resolve_path` always resolves `crate` to the current crate root, but
-                // rustdoc wants it to resolve to the `parent_scope`'s crate root. This trick of
-                // replacing `crate` with `self` and changing the current module should achieve
-                // the same effect.
-                segment.ident.name = kw::SelfLower;
-                parent_scope.module =
-                    self.expect_module(parent_scope.module.def_id().krate.as_def_id());
-            } else if segment.ident.name == kw::Empty {
+            if segment.ident.name == kw::Empty {
                 segment.ident.name = kw::PathRoot;
             }
         }

tests/rustdoc-ui/crate-reference-in-block-module.rs

@@ -0,0 +1,5 @@
+// check-pass
+fn main() {
+    /// [](crate)
+    struct X;
+}