Rollup merge of #134277 - notriddle:notriddle/inline-into, r=GuillaumeGomez

rustdoc-search: handle `impl Into<X>` better

This PR fixes two bugs I ran into while searching the compiler docs:

- It omitted an `impl Trait` entry in the type signature field, producing `TyCtxt, , Symbol -> bool`
- It didn't let me search for `TyCtxt, DefId, Symbol -> bool` even though that's a perfectly good description of the function I was looking for (the function actually used `impl Into<DefId>`

r? ``@GuillaumeGomez`` cc ``@lolbinarycat``

tests/rustdoc-js/impl-trait-inlining.js

@@ -0,0 +1,35 @@
+// exact-check
+// ignore-order
+
+const EXPECTED = [
+    {
+        'query': 'tyctxt, symbol -> bool',
+        'others': [
+            {
+                'path': 'foo::TyCtxt',
+                'name': 'has_attr',
+                'displayType': "`TyCtxt`, Into<DefId>, `Symbol` -> `bool`",
+            },
+        ],
+    },
+    {
+        'query': 'tyctxt, into<defid>, symbol -> bool',
+        'others': [
+            {
+                'path': 'foo::TyCtxt',
+                'name': 'has_attr',
+                'displayType': "`TyCtxt`, `Into`<`DefId`>, `Symbol` -> `bool`",
+            },
+        ],
+    },
+    {
+        'query': 'tyctxt, defid, symbol -> bool',
+        'others': [
+            {
+                'path': 'foo::TyCtxt',
+                'name': 'has_attr',
+                'displayType': "`TyCtxt`, Into<`DefId`>, `Symbol` -> `bool`",
+            },
+        ],
+    },
+];

tests/rustdoc-js/impl-trait-inlining.rs

@@ -0,0 +1,11 @@
+#![crate_name = "foo"]
+
+pub struct TyCtxt;
+pub struct DefId;
+pub struct Symbol;
+
+impl TyCtxt {
+    pub fn has_attr(self, _did: impl Into<DefId>, _attr: Symbol) -> bool {
+        unimplemented!();
+    }
+}