rustdoc: clean up method path index

This removes a special case that doesn't seem to do anything any more.

Author: notriddle

src/librustdoc/formats/cache.rs

@@ -288,15 +288,7 @@ impl<'a, 'tcx> DocFolder for CacheBuilder<'a, 'tcx> {
  // for where the type was defined. On the other
  // hand, `paths` always has the right
  // information if present.
- Some(&(
- ref fqp,
- ItemType::Trait
- | ItemType::Struct
- | ItemType::Union
- | ItemType::Enum
- | ItemType::Typedef,
- )) => Some(&fqp[..fqp.len() - 1]),
- Some(..) => Some(&*self.cache.stack),
+ Some(&(ref fqp, _)) => Some(&fqp[..fqp.len() - 1]),
  None => None,
  };
  ((Some(*last), path), true)

src/test/rustdoc-js/foreign-type-path.js

@@ -0,0 +1,9 @@
+const QUERY = 'MyForeignType::my_method';
+
+const EXPECTED = {
+ 'others': [
+ // Test case for https://github.com/rust-lang/rust/pull/96887#pullrequestreview-967154358
+ // Validates that the parent path for a foreign type method is correct.
+ { 'path': 'foreign_type_path::aaaaaaa::MyForeignType', 'name': 'my_method' },
+ ],
+};

src/test/rustdoc-js/foreign-type-path.rs

@@ -0,0 +1,13 @@
+#![feature(extern_types)]
+
+pub mod aaaaaaa {
+
+ extern {
+ pub type MyForeignType;
+ }
+
+ impl MyForeignType {
+ pub fn my_method() {}
+ }
+
+}