save-analysis: Account for async desugaring in async fn return types

1 files changed, 21 insertions, 0 deletions

diff --git a/src/test/ui/save-analysis/issue-65590.rs b/src/test/ui/save-analysis/issue-65590.rs
new file mode 100644
index 00000000000..27874f8655e
--- /dev/null
+++ b/src/test/ui/save-analysis/issue-65590.rs
@@ -0,0 +1,21 @@
+// check-pass
+// compile-flags: -Zsave-analysis
+// edition:2018
+
+// Async desugaring for return types in (associated) functions introduces a
+// separate definition internally, which we need to take into account
+// (or else we ICE).
+trait Trait { type Assoc; }
+struct Struct;
+
+async fn foobar<T: Trait>() -> T::Assoc {
+    unimplemented!()
+}
+
+impl Struct {
+    async fn foo<T: Trait>(&self) -> T::Assoc {
+        unimplemented!()
+    }
+}
+
+fn main() {}