| error: `extern` block uses type `Foo` which is not FFI-safe: this struct has unspecified layout |
| --> $DIR/issue-16250.rs:6:20 |
| | |
| LL | pub fn foo(x: (Foo)); |
| | ^^^ |
| | |
| note: lint level defined here |
| --> $DIR/issue-16250.rs:1:9 |
| | |
| LL | #![deny(warnings)] |
| | ^^^^^^^^ |
| = note: `#[deny(improper_ctypes)]` implied by `#[deny(warnings)]` |
| = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct |
| note: type defined here |
| --> $DIR/issue-16250.rs:3:1 |
| | |
| LL | pub struct Foo; |
| | ^^^^^^^^^^^^^^^ |
| |
| error: aborting due to previous error |
| |
