rustdoc: add regression test for rust-lang#146216

Author: lolbinarycat

tests/rustdoc-js/alias-path-distance-146214.js

@@ -0,0 +1,9 @@
+// exact-check
+
+// consider path distance for doc aliases
+// regression test for <https://github.com/rust-lang/rust/issues/146214>
+
+const EXPECTED = {
+    'query': 'Foo::zzz',
+    'others': [{ 'path': 'alias_path_distance::Foo', 'name': 'baz' }],
+};

tests/rustdoc-js/alias-path-distance-146214.rs

@@ -0,0 +1,14 @@
+#![crate_name = "alias_path_distance"]
+
+pub struct Foo;
+pub struct Bar;
+
+impl Foo {
+    #[doc(alias = "zzz")]
+    pub fn baz() {}
+}
+
+impl Bar {
+    #[doc(alias = "zzz")]
+    pub fn baz() {}
+}