1 error: `extern` block uses type `Qux`, which is not FFI-safe
2 --> $DIR/lint-ctypes-73249-2.rs:26:25
4 LL | pub fn lint_me() -> A<()>;
7 note: the lint level is defined here
8 --> $DIR/lint-ctypes-73249-2.rs:2:9
10 LL | #![deny(improper_ctypes)]
12 = note: opaque types have no C equivalent
14 error: aborting due to previous error