Fix `const_fn_trait_ref_impl`, add test for it

1 files changed, 35 insertions, 0 deletions

diff --git a/src/test/ui/consts/fn_trait_refs.rs b/src/test/ui/consts/fn_trait_refs.rs
new file mode 100644
index 00000000000..57465c55925
--- /dev/null
+++ b/src/test/ui/consts/fn_trait_refs.rs
@@ -0,0 +1,35 @@
+// run-pass
+#![feature(const_fn_trait_ref_impls)]
+#![feature(fn_traits)]
+#![feature(unboxed_closures)]
+#![feature(const_trait_impl)]
+#![feature(const_mut_refs)]
+
+use std::marker::Destruct;
+
+const fn test(i: i32) -> i32 {
+    i + 1
+}
+
+const fn call<F: ~const FnMut(i32) -> i32 + ~const Destruct>(mut f: F) -> F::Output {
+    f(5)
+}
+
+const fn use_fn<F: ~const FnMut(i32) -> i32 + ~const Destruct>(mut f: F) -> F::Output {
+    call(&mut f)
+}
+
+const fn test_fn() {}
+
+const fn tester<T>(_fn: T)
+where
+    T: ~const Fn() + ~const Destruct,
+{
+}
+
+const fn main() {
+    tester(test_fn);
+    let test_ref = &test_fn;
+    tester(test_ref);
+    assert!(use_fn(test) == 6);
+}