1 files changed, 8 insertions, 0 deletions
diff --git a/src/test/ui/type-alias-impl-trait/cross_inference_pattern_bug.rs b/src/test/ui/type-alias-impl-trait/cross_inference_pattern_bug.rs
new file mode 100644
index 000000000..811832848
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/cross_inference_pattern_bug.rs
@@ -0,0 +1,8 @@
+// compile-flags: --edition=2021
+#![feature(type_alias_impl_trait)]
+
+fn main() {
+    type T = impl Copy; //~ ERROR unconstrained opaque type
+    let foo: T = (1u32, 2u32);
+    let (a, b): (u32, u32) = foo;
+}