1 files changed, 30 insertions, 0 deletions
diff --git a/src/test/ui/mir/mir-typeck-normalize-fn-sig.rs b/src/test/ui/mir/mir-typeck-normalize-fn-sig.rs
new file mode 100644
index 000000000..bdd9321af
--- /dev/null
+++ b/src/test/ui/mir/mir-typeck-normalize-fn-sig.rs
@@ -0,0 +1,30 @@
+// run-pass
+#![allow(unused_variables)]
+// This code was creating an ICE in the MIR type checker. The reason
+// is that we are reifying a reference to a function (`foo::<'x>`),
+// which involves extracting its signature, but we were not
+// normalizing the signature afterwards. As a result, we sometimes got
+// errors around the `<u32 as Foo<'x>>::Value`, which can be
+// normalized to `f64`.
+
+#![allow(dead_code)]
+
+trait Foo<'x> {
+    type Value;
+}
+
+impl<'x> Foo<'x> for u32 {
+    type Value = f64;
+}
+
+struct Providers<'x> {
+    foo: for<'y> fn(x: &'x u32, y: &'y u32) -> <u32 as Foo<'x>>::Value,
+}
+
+fn foo<'y, 'x: 'x>(x: &'x u32, y: &'y u32) -> <u32 as Foo<'x>>::Value {
+    *x as f64
+}
+
+fn main() {
+    Providers { foo };
+}