Add more tests

src/librustdoc/clean/mod.rs

@@ -1448,7 +1448,7 @@ impl Clean<Type> for hir::Ty<'_> {
                 // There are two times a `Fresh` lifetime can be created:
                 // 1. For `&'_ x`, written by the user. This corresponds to `lower_lifetime` in `rustc_ast_lowering`.
                 // 2. For `&x` as a parameter to an `async fn`. This corresponds to `elided_ref_lifetime in `rustc_ast_lowering`.
-                //    See commit 749349fc9f7b12f212bca9ba2297e463328cb701 for more information.
+                //    See #59286 for more information.
                 // Ideally we would only hide the `'_` for case 2., but I don't know a way to distinguish it.
                 // Turning `fn f(&'_ self)` into `fn f(&self)` isn't the worst thing in the world, though;
                 // there's no case where it could cause the function to fail to compile.

src/test/rustdoc/async-fn.rs

@@ -49,6 +49,8 @@ impl Foo {
     pub async fn mut_self(mut self, mut first: usize) {}
 }
 
+pub trait Pattern<'a> {}
+
 pub trait Trait<const N: usize> {}
 // @has async_fn/fn.const_generics.html
 // @has - '//pre[@class="rust fn"]' 'pub async fn const_generics<const N: usize>(_: impl Trait<N>)'
@@ -70,6 +72,9 @@ pub async fn static_trait(foo: &str) -> Box<dyn Bar> {}
 // @has async_fn/fn.lifetime_for_trait.html
 // @has - '//pre[@class="rust fn"]' "pub async fn lifetime_for_trait(foo: &str) -> Box<dyn Bar + '_>"
 pub async fn lifetime_for_trait(foo: &str) -> Box<dyn Bar + '_> {}
+// @has async_fn/fn.elided_in_input_trait.html
+// @has - '//pre[@class="rust fn"]' "pub async fn elided_in_input_trait(t: impl Pattern<'_>)"
+pub async fn elided_in_input_trait(t: impl Pattern<'_>) {}
 
 struct AsyncFdReadyGuard<'a, T> { x: &'a T }
 
@@ -80,4 +85,14 @@ impl Foo {
     // taken from `tokio` as an example of a method that was particularly bad before
     // @has - '//h4[@class="method"]' "pub async fn readable<T>(&self) -> Result<AsyncFdReadyGuard<'_, T>, ()>"
     pub async fn readable<T>(&self) -> Result<AsyncFdReadyGuard<'_, T>, ()> {}
+    // @has - '//h4[@class="method"]' "pub async fn mut_self(&mut self)"
+    pub async fn mut_self(&mut self) {}
 }
+
+// test named lifetimes, just in case
+// @has async_fn/fn.named.html
+// @has - '//pre[@class="rust fn"]' "pub async fn named<'a, 'b>(foo: &'a str) -> &'b str"
+pub async fn named<'a, 'b>(foo: &'a str) -> &'b str {}
+// @has async_fn/fn.named_trait.html
+// @has - '//pre[@class="rust fn"]' "pub async fn named_trait<'a, 'b>(foo: impl Pattern<'a>) -> impl Pattern<'b>"
+pub async fn named_trait<'a, 'b>(foo: impl Pattern<'a>) -> impl Pattern<'b> {}