1 error: `extern` block uses type `Qux`, which is not FFI-safe
2 --> $DIR/lint-ctypes-73249-3.rs:20:25
4 LL | pub fn lint_me() -> A;
7 = note: opaque types have no C equivalent
8 note: the lint level is defined here
9 --> $DIR/lint-ctypes-73249-3.rs:2:9
11 LL | #![deny(improper_ctypes)]
14 error: aborting due to previous error