1 files changed, 24 insertions, 0 deletions
diff --git a/tests/ui/rfc-2008-non-exhaustive/improper_ctypes/extern_crate_improper.rs b/tests/ui/rfc-2008-non-exhaustive/improper_ctypes/extern_crate_improper.rs
new file mode 100644
index 000000000..15c0c695f
--- /dev/null
+++ b/tests/ui/rfc-2008-non-exhaustive/improper_ctypes/extern_crate_improper.rs
@@ -0,0 +1,24 @@
+// aux-build:types.rs
+#![deny(improper_ctypes)]
+
+extern crate types;
+
+// This test checks that non-exhaustive types with `#[repr(C)]` from an extern crate are considered
+// improper.
+
+use types::{NonExhaustiveEnum, NonExhaustiveVariants, NormalStruct, TupleStruct, UnitStruct};
+
+extern "C" {
+    pub fn non_exhaustive_enum(_: NonExhaustiveEnum);
+    //~^ ERROR `extern` block uses type `NonExhaustiveEnum`, which is not FFI-safe
+    pub fn non_exhaustive_normal_struct(_: NormalStruct);
+    //~^ ERROR `extern` block uses type `NormalStruct`, which is not FFI-safe
+    pub fn non_exhaustive_unit_struct(_: UnitStruct);
+    //~^ ERROR `extern` block uses type `UnitStruct`, which is not FFI-safe
+    pub fn non_exhaustive_tuple_struct(_: TupleStruct);
+    //~^ ERROR `extern` block uses type `TupleStruct`, which is not FFI-safe
+    pub fn non_exhaustive_variant(_: NonExhaustiveVariants);
+    //~^ ERROR `extern` block uses type `NonExhaustiveVariants`, which is not FFI-safe
+}
+
+fn main() {}