1 files changed, 35 insertions, 0 deletions
diff --git a/src/test/ui/run-pass/traits/trait-inheritance-num5.rs b/src/test/ui/run-pass/traits/trait-inheritance-num5.rs
new file mode 100644
index 00000000000..bd442629243
--- /dev/null
+++ b/src/test/ui/run-pass/traits/trait-inheritance-num5.rs
@@ -0,0 +1,35 @@
+// Copyright 2012 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.
+
+// pretty-expanded FIXME #23616
+
+pub trait NumCast: Sized {
+    fn from(i: i32) -> Option<Self>;
+}
+
+pub trait NumExt: PartialEq + NumCast {}
+
+impl NumExt for f32 {}
+impl NumExt for isize {}
+
+impl NumCast for f32 {
+    fn from(i: i32) -> Option<f32> { Some(i as f32) }
+}
+impl NumCast for isize {
+    fn from(i: i32) -> Option<isize> { Some(i as isize) }
+}
+
+fn num_eq_one<T:NumExt>() -> T {
+    NumCast::from(1).unwrap()
+}
+
+pub fn main() {
+    num_eq_one::<isize>(); // you need to actually use the function to trigger the ICE
+}