Allow trait method paths to satisfy const Fn bounds

1 files changed, 19 insertions, 0 deletions

diff --git a/src/test/ui/rfc-2632-const-trait-impl/const-closure-trait-method.rs b/src/test/ui/rfc-2632-const-trait-impl/const-closure-trait-method.rs
new file mode 100644
index 00000000000..3e6d1908848
--- /dev/null
+++ b/src/test/ui/rfc-2632-const-trait-impl/const-closure-trait-method.rs
@@ -0,0 +1,19 @@
+// check-pass
+#![feature(const_trait_impl)]
+
+#[const_trait]
+trait Tr {
+    fn a(self) -> i32;
+}
+
+impl const Tr for () {
+    fn a(self) -> i32 { 42 }
+}
+
+const fn need_const_closure<T: ~const FnOnce(()) -> i32>(x: T) -> i32 {
+    x(())
+}
+
+const _: () = assert!(need_const_closure(Tr::a) == 42);
+
+fn main() {}