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Rollup merge of #106675 - krtab:fix_improper_ctypes, r=davidtwco
Mark ZST as FFI-safe if all its fields are PhantomData This presents one possible solution to issue: #106629. This is my first (tentative) contribution to the compiler itself. I'm looking forward for comments and feedback Closes: #106629
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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. | ||
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// check-pass | ||
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#[repr(transparent)] | ||
#[derive(Copy, Clone)] | ||
struct MyPhantom(core::marker::PhantomData<u8>); | ||
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#[repr(C)] | ||
#[derive(Copy, Clone)] | ||
pub struct Bar { | ||
pub x: i32, | ||
_marker: MyPhantom, | ||
} | ||
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extern "C" { | ||
pub fn foo(bar: *mut Bar); | ||
} | ||
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fn main() {} |