1 files changed, 22 insertions, 0 deletions
diff --git a/src/test/ui/lint/lint-ctypes-73251.rs b/src/test/ui/lint/lint-ctypes-73251.rs
new file mode 100644
index 000000000..ebc2ca77b
--- /dev/null
+++ b/src/test/ui/lint/lint-ctypes-73251.rs
@@ -0,0 +1,22 @@
+// check-pass
+
+#![feature(type_alias_impl_trait)]
+#![deny(improper_ctypes)]
+
+pub trait Foo {
+    type Assoc;
+}
+
+impl Foo for () {
+    type Assoc = u32;
+}
+
+type Bar = impl Foo<Assoc = u32>;
+
+fn assign() -> Bar {}
+
+extern "C" {
+    pub fn lint_me() -> <Bar as Foo>::Assoc;
+}
+
+fn main() {}