1 files changed, 34 insertions, 0 deletions
diff --git a/src/test/ui/mir/issue-67639-normalization-ice.rs b/src/test/ui/mir/issue-67639-normalization-ice.rs
new file mode 100644
index 000000000..71150a80b
--- /dev/null
+++ b/src/test/ui/mir/issue-67639-normalization-ice.rs
@@ -0,0 +1,34 @@
+// compile-flags: -Z mir-opt-level=4
+// build-pass
+
+// This used to ICE in const-prop due
+// to an empty ParamEnv being used during normalization
+// of a generic type
+
+
+fn main() {
+    join_all::<u32>();
+}
+
+trait Foo {
+    type Item;
+}
+
+impl Foo for u32 {
+    type Item = u8;
+}
+
+trait Bar {
+    type Item2;
+}
+
+impl Bar for u8 {
+    type Item2 = u64;
+}
+
+fn join_all<I>()
+where I: Foo,
+    I::Item: Bar
+{
+    Vec::<<I::Item as Bar>::Item2>::new(); // ICE occurs processing this line
+}