Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 27 insertions, 0 deletions

diff --git a/src/test/ui/higher-rank-trait-bounds/hrtb-fn-like-trait.rs b/src/test/ui/higher-rank-trait-bounds/hrtb-fn-like-trait.rs
new file mode 100644
index 000000000..afab9986c
--- /dev/null
+++ b/src/test/ui/higher-rank-trait-bounds/hrtb-fn-like-trait.rs
@@ -0,0 +1,27 @@
+// run-pass
+// A basic test of using a higher-ranked trait bound.
+
+
+trait FnLike<A,R> {
+    fn call(&self, arg: A) -> R;
+}
+
+struct Identity;
+
+impl<'a, T> FnLike<&'a T, &'a T> for Identity {
+    fn call(&self, arg: &'a T) -> &'a T {
+        arg
+    }
+}
+
+fn call_repeatedly<F>(f: F)
+    where F : for<'a> FnLike<&'a isize, &'a isize>
+{
+    let x = 3;
+    let y = f.call(&x);
+    assert_eq!(3, *y);
+}
+
+fn main() {
+    call_repeatedly(Identity);
+}