| error: `extern` block uses type `impl std::ops::Fn<()>`, which is not FFI-safe | |
| --> $DIR/opaque-ty-ffi-unsafe.rs:11:17 | |
| | | |
| LL | pub fn a(_: A); | |
| | ^ not FFI-safe | |
| | | |
| note: the lint level is defined here | |
| --> $DIR/opaque-ty-ffi-unsafe.rs:2:9 | |
| | | |
| LL | #![deny(improper_ctypes)] | |
| | ^^^^^^^^^^^^^^^ | |
| = note: opaque types have no C equivalent | |
| error: aborting due to previous error | |