1 files changed, 18 insertions, 0 deletions
diff --git a/src/test/ui/type-alias-impl-trait/multiple-def-uses-in-one-fn3.rs b/src/test/ui/type-alias-impl-trait/multiple-def-uses-in-one-fn3.rs
new file mode 100644
index 000000000..11a922443
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/multiple-def-uses-in-one-fn3.rs
@@ -0,0 +1,18 @@
+// https://github.com/rust-lang/rust/issues/73481
+// This test used to cause unsoundness, since one of the two possible
+// resolutions was chosen at random instead of erroring due to conflicts.
+
+#![feature(type_alias_impl_trait)]
+
+type X<A: ToString + Clone, B: ToString + Clone> = impl ToString;
+
+fn f<A: ToString + Clone, B: ToString + Clone>(a: A, b: B) -> (X<A, B>, X<B, A>) {
+    (a, b)
+}
+
+fn g<A: ToString + Clone, B: ToString + Clone>(a: A, b: B) -> (X<A, B>, X<A, B>) {
+    (a, b)
+    //~^ ERROR mismatched types
+}
+
+fn main() {}