mirror of https://github.com/rust-lang/rust
35 lines
709 B
Rust
35 lines
709 B
Rust
#![allow(dead_code, cenum_impl_drop_cast)]
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// check dtor calling order when casting enums.
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use std::sync::atomic;
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use std::sync::atomic::Ordering;
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use std::mem;
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enum E {
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A = 0,
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B = 1,
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C = 2
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}
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static FLAG: atomic::AtomicUsize = atomic::AtomicUsize::new(0);
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impl Drop for E {
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fn drop(&mut self) {
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// avoid dtor loop
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unsafe { mem::forget(mem::replace(self, E::B)) };
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FLAG.store(FLAG.load(Ordering::SeqCst)+1, Ordering::SeqCst);
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}
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}
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fn main() {
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assert_eq!(FLAG.load(Ordering::SeqCst), 0);
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{
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let e = E::C;
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assert_eq!(e as u32, 2);
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assert_eq!(FLAG.load(Ordering::SeqCst), 1);
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}
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assert_eq!(FLAG.load(Ordering::SeqCst), 1);
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}
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