Fix elided lifetimes shown as `'_` on async functions

1 files changed, 29 insertions, 0 deletions

diff --git a/src/test/rustdoc/async-fn.rs b/src/test/rustdoc/async-fn.rs
index e7a7d1831f7..7a673b9f670 100644
--- a/src/test/rustdoc/async-fn.rs
+++ b/src/test/rustdoc/async-fn.rs
@@ -1,3 +1,4 @@
+// ignore-tidy-linelength
 // edition:2018
 #![feature(min_const_generics)]
 
@@ -52,3 +53,31 @@ 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>)'
 pub async fn const_generics<const N: usize>(_: impl Trait<N>) {}
+
+// test that elided lifetimes are properly elided and not displayed as `'_`
+// regression test for #63037
+// @has async_fn/fn.elided.html
+// @has - '//pre[@class="rust fn"]' 'pub async fn elided(foo: &str) -> &str'
+pub async fn elided(foo: &str) -> &str {}
+// This should really be shown as written, but for implementation reasons it's difficult.
+// See `impl Clean for TyKind::Rptr`.
+// @has async_fn/fn.user_elided.html
+// @has - '//pre[@class="rust fn"]' 'pub async fn user_elided(foo: &str) -> &str'
+pub async fn user_elided(foo: &'_ str) -> &str {}
+// @has async_fn/fn.static_trait.html
+// @has - '//pre[@class="rust fn"]' 'pub async fn static_trait(foo: &str) -> Box<dyn Bar>'
+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 + '_> {}
+
+struct AsyncFdReadyGuard<'a, T> { x: &'a T }
+
+impl Foo {
+    // @has async_fn/struct.Foo.html
+    // @has - '//h4[@class="method"]' 'pub async fn complicated_lifetimes( &self, context: &impl Bar) -> impl Iterator<Item = &usize>'
+    pub async fn complicated_lifetimes(&self, context: &impl Bar) -> impl Iterator<Item = &usize> {}
+    // 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>, ()> {}
+}