1 files changed, 48 insertions, 0 deletions
diff --git a/src/test/ui/run-pass/methods/method-recursive-blanket-impl.rs b/src/test/ui/run-pass/methods/method-recursive-blanket-impl.rs
new file mode 100644
index 00000000000..6877bf376a6
--- /dev/null
+++ b/src/test/ui/run-pass/methods/method-recursive-blanket-impl.rs
@@ -0,0 +1,48 @@
+// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// Test that we don't trigger on the blanket impl for all `&'a T` but
+// rather keep autoderefing and trigger on the underlying impl.  To
+// know not to stop at the blanket, we have to recursively evaluate
+// the `T:Foo` bound.
+
+// pretty-expanded FIXME #23616
+
+use std::marker::Sized;
+
+// Note: this must be generic for the problem to show up
+trait Foo<A> {
+    fn foo(&self, a: A);
+}
+
+impl Foo<u8> for [u8] {
+    fn foo(&self, a: u8) {}
+}
+
+impl<'a, A, T> Foo<A> for &'a T where T: Foo<A> {
+    fn foo(&self, a: A) {
+        Foo::foo(*self, a)
+    }
+}
+
+trait Bar {
+    fn foo(&self);
+}
+
+struct MyType;
+
+impl Bar for MyType {
+    fn foo(&self) {}
+}
+
+fn main() {
+    let mut m = MyType;
+    (&mut m).foo()
+}