1 files changed, 48 insertions, 0 deletions
diff --git a/tests/ui/rfc-2091-track-caller/track-caller-ffi.rs b/tests/ui/rfc-2091-track-caller/track-caller-ffi.rs
new file mode 100644
index 000000000..5115f687c
--- /dev/null
+++ b/tests/ui/rfc-2091-track-caller/track-caller-ffi.rs
@@ -0,0 +1,48 @@
+// run-pass
+
+use std::panic::Location;
+
+extern "Rust" {
+    #[track_caller]
+    fn rust_track_caller_ffi_test_tracked() -> &'static Location<'static>;
+    fn rust_track_caller_ffi_test_untracked() -> &'static Location<'static>;
+}
+
+fn rust_track_caller_ffi_test_nested_tracked() -> &'static Location<'static> {
+    unsafe { rust_track_caller_ffi_test_tracked() }
+}
+
+mod provides {
+    use std::panic::Location;
+    #[track_caller] // UB if we did not have this!
+    #[no_mangle]
+    fn rust_track_caller_ffi_test_tracked() -> &'static Location<'static> {
+        Location::caller()
+    }
+    #[no_mangle]
+    fn rust_track_caller_ffi_test_untracked() -> &'static Location<'static> {
+        Location::caller()
+    }
+}
+
+fn main() {
+    let location = Location::caller();
+    assert_eq!(location.file(), file!());
+    assert_eq!(location.line(), 29);
+    assert_eq!(location.column(), 20);
+
+    let tracked = unsafe { rust_track_caller_ffi_test_tracked() };
+    assert_eq!(tracked.file(), file!());
+    assert_eq!(tracked.line(), 34);
+    assert_eq!(tracked.column(), 28);
+
+    let untracked = unsafe { rust_track_caller_ffi_test_untracked() };
+    assert_eq!(untracked.file(), file!());
+    assert_eq!(untracked.line(), 24);
+    assert_eq!(untracked.column(), 9);
+
+    let contained = rust_track_caller_ffi_test_nested_tracked();
+    assert_eq!(contained.file(), file!());
+    assert_eq!(contained.line(), 12);
+    assert_eq!(contained.column(), 14);
+}