Rollup merge of rust-lang#108875 - notriddle:notriddle/return-trait, r=GuillaumeGomez

rustdoc: fix type search for `Option` combinators

Author: matthiaskrgr

src/librustdoc/html/render/search_index.rs

@@ -486,7 +486,7 @@ fn add_generics_and_bounds_as_types<'tcx, 'a>(
     }
 
     // First, check if it's "Self".
-    let arg = if let Some(self_) = self_ {
+    let mut arg = if let Some(self_) = self_ {
         match &*arg {
             Type::BorrowedRef { type_, .. } if type_.is_self_type() => self_,
             type_ if type_.is_self_type() => self_,
@@ -496,11 +496,16 @@ fn add_generics_and_bounds_as_types<'tcx, 'a>(
         arg
     };
 
+    // strip references from the argument type
+    while let Type::BorrowedRef { type_, .. } = &*arg {
+        arg = &*type_;
+    }
+
     // If this argument is a type parameter and not a trait bound or a type, we need to look
     // for its bounds.
     if let Type::Generic(arg_s) = *arg {
         // First we check if the bounds are in a `where` predicate...
-        if let Some(where_pred) = generics.where_predicates.iter().find(|g| match g {
+        for where_pred in generics.where_predicates.iter().filter(|g| match g {
             WherePredicate::BoundPredicate { ty: Type::Generic(ty_s), .. } => *ty_s == arg_s,
             _ => false,
         }) {

tests/rustdoc-js-std/option-type-signatures.js

@@ -1,7 +1,18 @@
-const QUERY = 'option, fnonce -> option';
+const QUERY = [
+    'option, fnonce -> option',
+    'option -> default',
+];
 
-const EXPECTED = {
-    'others': [
-        { 'path': 'std::option::Option', 'name': 'map' },
-    ],
-};
+const EXPECTED = [
+    {
+        'others': [
+            { 'path': 'std::option::Option', 'name': 'map' },
+        ],
+    },
+    {
+        'others': [
+            { 'path': 'std::option::Option', 'name': 'unwrap_or_default' },
+            { 'path': 'std::option::Option', 'name': 'get_or_insert_default' },
+        ],
+    },
+];

tests/rustdoc-js/where-clause.js

@@ -1,4 +1,4 @@
-const QUERY = ['trait<nested>', '-> trait<nested>', 't1, t2'];
+const QUERY = ['trait<nested>', '-> trait<nested>', 't1, t2', '-> shazam', 'drizzel -> shazam'];
 
 const EXPECTED = [
     {
@@ -16,4 +16,15 @@ const EXPECTED = [
             { 'path': 'where_clause', 'name': 'presto' },
         ],
     },
+    {
+        'others': [
+            { 'path': 'where_clause', 'name': 'bippety' },
+            { 'path': 'where_clause::Drizzel', 'name': 'boppety' },
+        ],
+    },
+    {
+        'others': [
+            { 'path': 'where_clause::Drizzel', 'name': 'boppety' },
+        ],
+    },
 ];

tests/rustdoc-js/where-clause.rs

@@ -14,3 +14,17 @@ pub trait T2<'a, T> {
 }
 
 pub fn presto<A, B>(_: A, _: B) where A: T1, B: for <'b> T2<'b, Nested> {}
+
+pub trait Shazam {}
+
+pub fn bippety<X>() -> &'static X where X: Shazam {
+    panic!()
+}
+
+pub struct Drizzel<T>(T);
+
+impl<T> Drizzel<T> {
+    pub fn boppety(&self) -> &T where T: Shazam {
+        panic!();
+    }
+}