1 files changed, 22 insertions, 0 deletions
diff --git a/tests/ui/traits/next-solver/supertrait-alias-1.rs b/tests/ui/traits/next-solver/supertrait-alias-1.rs
new file mode 100644
index 00000000000..579a44677c2
--- /dev/null
+++ b/tests/ui/traits/next-solver/supertrait-alias-1.rs
@@ -0,0 +1,22 @@
+//@ compile-flags: -Znext-solver
+//@ check-pass
+
+// Regression test for <https://github.com/rust-lang/trait-system-refactor-initiative/issues/171>.
+// Tests that we don't try to replace `<V as Super>::Output` when replacing projections in the
+// required bounds for `dyn Trait`, b/c `V` is not relevant to the dyn type, which we were
+// previously encountering b/c we were walking into the existential projection bounds of the dyn
+// type itself.
+
+pub trait Trait: Super {}
+
+pub trait Super {
+    type Output;
+}
+
+fn bound<T: Trait + ?Sized>() {}
+
+fn visit_simd_operator<V: Super + ?Sized>() {
+    bound::<dyn Trait<Output = <V as Super>::Output>>();
+}
+
+fn main() {}