1 files changed, 19 insertions, 0 deletions
diff --git a/tests/ui/traits/inheritance/num3.rs b/tests/ui/traits/inheritance/num3.rs
new file mode 100644
index 000000000..c40be6f83
--- /dev/null
+++ b/tests/ui/traits/inheritance/num3.rs
@@ -0,0 +1,19 @@
+// run-pass
+pub trait NumCast: Sized {
+    fn from(i: i32) -> Option<Self>;
+}
+
+pub trait NumExt: PartialEq + PartialOrd + NumCast {}
+
+impl NumExt for f32 {}
+impl NumCast for f32 {
+    fn from(i: i32) -> Option<f32> { Some(i as f32) }
+}
+
+fn num_eq_one<T: NumExt>(n: T) {
+    println!("{}", n == NumCast::from(1).unwrap())
+}
+
+pub fn main() {
+    num_eq_one(1f32); // you need to actually use the function to trigger the ICE
+}