1 files changed, 27 insertions, 0 deletions
diff --git a/tests/ui/impl-trait/non-defining-uses/no-rigid-alias.rs b/tests/ui/impl-trait/non-defining-uses/no-rigid-alias.rs
new file mode 100644
index 00000000000..fca5db3e20f
--- /dev/null
+++ b/tests/ui/impl-trait/non-defining-uses/no-rigid-alias.rs
@@ -0,0 +1,27 @@
+//@ compile-flags: -Znext-solver
+//@ ignore-compare-mode-next-solver (explicit revisions)
+//@ check-pass
+#![allow(unconditional_recursion)]
+
+// Test for trait-system-refactor-initiative#182 making sure
+// that we don't incorrectly normalize to rigid aliases if the
+// opaque type only has a trait bound.
+
+trait Id {
+    type This;
+}
+impl<T> Id for Vec<T> {
+    type This = Vec<T>;
+}
+fn to_assoc<T: Id>(x: T) -> <T as Id>::This {
+    todo!()
+}
+
+fn mirror<T>(x: Vec<T>) -> impl Id {
+    let x = to_assoc(mirror(x));
+    // `?x` equals `<opaque::<T> as Id>::This`. We should not infer `?x`
+    // to be a rigid alias here.
+    let _: Vec<u32> = x;
+    x
+}
+fn main() {}