1 files changed, 13 insertions, 0 deletions
diff --git a/src/test/ui/type-alias-impl-trait/declared_but_not_defined_in_scope.rs b/src/test/ui/type-alias-impl-trait/declared_but_not_defined_in_scope.rs
new file mode 100644
index 000000000..5bda5f0fc
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/declared_but_not_defined_in_scope.rs
@@ -0,0 +1,13 @@
+#![feature(type_alias_impl_trait)]
+
+fn main() {}
+
+mod boo {
+    // declared in module but not defined inside of it
+    pub type Boo = impl ::std::fmt::Debug; //~ ERROR unconstrained opaque type
+}
+
+fn bomp() -> boo::Boo {
+    ""
+    //~^ mismatched types
+}