1 files changed, 26 insertions, 0 deletions
diff --git a/src/test/ui/lint/lint-ctypes-73251-1.rs b/src/test/ui/lint/lint-ctypes-73251-1.rs
new file mode 100644
index 000000000..145ba784f
--- /dev/null
+++ b/src/test/ui/lint/lint-ctypes-73251-1.rs
@@ -0,0 +1,26 @@
+#![feature(type_alias_impl_trait)]
+#![deny(improper_ctypes)]
+
+pub trait Baz {}
+
+impl Baz for u32 {}
+
+type Qux = impl Baz;
+
+pub trait Foo {
+    type Assoc;
+}
+
+impl Foo for u32 {
+    type Assoc = Qux;
+}
+
+fn assign() -> Qux {
+    1
+}
+
+extern "C" {
+    pub fn lint_me() -> <u32 as Foo>::Assoc; //~ ERROR: uses type `Qux`
+}
+
+fn main() {}