Rollup merge of #108723 - notriddle:notriddle/where-clause, r=GuillaumeGomez

rustdoc: function signature search with traits in `where` clause

## Before

![image](https://user-images.githubusercontent.com/1593513/222873534-a640a72a-c654-4702-9f3b-175129d9591d.png)

## After

![image](https://user-images.githubusercontent.com/1593513/222873544-fdfc431d-2b65-4b56-bede-0302ea9f153a.png)

1 files changed, 7 insertions, 0 deletions

diff --git a/tests/rustdoc-js-std/option-type-signatures.js b/tests/rustdoc-js-std/option-type-signatures.js
new file mode 100644
index 00000000000..dee4819e81a
--- /dev/null
+++ b/tests/rustdoc-js-std/option-type-signatures.js
@@ -0,0 +1,7 @@
+const QUERY = 'option, fnonce -> option';
+
+const EXPECTED = {
+    'others': [
+        { 'path': 'std::option::Option', 'name': 'map' },
+    ],
+};