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-rw-r--r--src/test/ui/lint/opaque-ty-ffi-unsafe.rs15
1 files changed, 15 insertions, 0 deletions
diff --git a/src/test/ui/lint/opaque-ty-ffi-unsafe.rs b/src/test/ui/lint/opaque-ty-ffi-unsafe.rs
new file mode 100644
index 000000000..b7cc38e99
--- /dev/null
+++ b/src/test/ui/lint/opaque-ty-ffi-unsafe.rs
@@ -0,0 +1,15 @@
+#![feature(type_alias_impl_trait)]
+#![deny(improper_ctypes)]
+
+type A = impl Fn();
+
+pub fn ret_closure() -> A {
+ || {}
+}
+
+extern "C" {
+ pub fn a(_: A);
+ //~^ ERROR `extern` block uses type `A`, which is not FFI-safe [improper_ctypes]
+}
+
+fn main() {}