rust/tests/ui/lint/lint-ffi-safety-all-phantom.rs

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// This is a regression test for issue https://github.com/rust-lang/rust/issues/106629.
// It ensures that transparent types where all fields are PhantomData are marked as
// FFI-safe.
//@ check-pass
#[repr(transparent)]
#[derive(Copy, Clone)]
struct MyPhantom(core::marker::PhantomData<u8>);
#[repr(C)]
#[derive(Copy, Clone)]
pub struct Bar {
pub x: i32,
_marker: MyPhantom,
}
extern "C" {
pub fn foo(bar: *mut Bar);
}
fn main() {}