32 lines
692 B
Rust
32 lines
692 B
Rust
// run-pass
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#![allow(dead_code)]
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#![allow(non_upper_case_globals)]
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struct CustomAutoRooterVFTable {
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trace: unsafe extern "C" fn(this: *mut i32, trc: *mut u32),
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}
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unsafe trait CustomAutoTraceable: Sized {
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const vftable: CustomAutoRooterVFTable = CustomAutoRooterVFTable {
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trace: Self::trace,
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};
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unsafe extern "C" fn trace(this: *mut i32, trc: *mut u32) {
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let this = this as *const Self;
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let this = this.as_ref().unwrap();
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Self::do_trace(this, trc);
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}
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fn do_trace(&self, trc: *mut u32);
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}
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unsafe impl CustomAutoTraceable for () {
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fn do_trace(&self, _: *mut u32) {
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// nop
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}
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}
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fn main() {
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let _ = <()>::vftable;
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}
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