1 files changed, 18 insertions, 0 deletions
diff --git a/src/test/ui/const-generics/backcompat/unevaluated-consts.rs b/src/test/ui/const-generics/backcompat/unevaluated-consts.rs
new file mode 100644
index 000000000..3f90d22ae
--- /dev/null
+++ b/src/test/ui/const-generics/backcompat/unevaluated-consts.rs
@@ -0,0 +1,18 @@
+// check-pass
+
+// If we allow the parent generics here without using lazy normalization
+// this results in a cycle error.
+struct Foo<T, U>(T, U);
+
+impl<T> From<[u8; 1 + 1]> for Foo<T, [u8; 1 + 1]> {
+    fn from(value: [u8; 1 + 1]) -> Foo<T, [u8; 1 + 1]> {
+        todo!();
+    }
+}
+
+fn break_me<T>()
+where
+    [u8; 1 + 1]: From<[u8; 1 + 1]>
+{}
+
+fn main() {}