Deduce closure signature from TAIT supertraits

1 files changed, 15 insertions, 0 deletions

diff --git a/src/test/ui/impl-trait/deduce-signature-from-supertrait.rs b/src/test/ui/impl-trait/deduce-signature-from-supertrait.rs
new file mode 100644
index 00000000000..d2c34792035
--- /dev/null
+++ b/src/test/ui/impl-trait/deduce-signature-from-supertrait.rs
@@ -0,0 +1,15 @@
+// check-pass
+
+#![feature(type_alias_impl_trait)]
+
+trait SuperExpectation: Fn(i32) {}
+
+impl<T: Fn(i32)> SuperExpectation for T {}
+
+type Foo = impl SuperExpectation;
+
+fn main() {
+    let _: Foo = |x| {
+        let _ = x.to_string();
+    };
+}