Rollup merge of #116436 - compiler-errors:structurally-normalize-for-closure, r=lcnr

Structurally normalize for closure

Fixes some signature deduction problems in the new trait solver (and in the case of async, an ICE).

r? lcnr

2 files changed, 23 insertions, 0 deletions

diff --git a/tests/ui/traits/new-solver/deduce-closure-signature-after-normalization.rs b/tests/ui/traits/new-solver/deduce-closure-signature-after-normalization.rs
new file mode 100644
index 00000000000..d67fc65032c
--- /dev/null
+++ b/tests/ui/traits/new-solver/deduce-closure-signature-after-normalization.rs
@@ -0,0 +1,12 @@
+// compile-flags: -Ztrait-solver=next
+// check-pass
+
+#![feature(return_position_impl_trait_in_trait)]
+
+trait Foo {
+    fn test() -> impl Fn(u32) -> u32 {
+        |x| x.count_ones()
+    }
+}
+
+fn main() {}
diff --git a/tests/ui/traits/new-solver/normalize-async-closure-in-trait.rs b/tests/ui/traits/new-solver/normalize-async-closure-in-trait.rs
new file mode 100644
index 00000000000..b6200096a89
--- /dev/null
+++ b/tests/ui/traits/new-solver/normalize-async-closure-in-trait.rs
@@ -0,0 +1,11 @@
+// compile-flags: -Ztrait-solver=next
+// check-pass
+// edition:2021
+
+#![feature(async_fn_in_trait)]
+
+trait Foo {
+    async fn bar() {}
+}
+
+fn main() {}