// 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() {}