43 lines
888 B
Rust
43 lines
888 B
Rust
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// Check that we aren't using unsound specialization in slice comparisons.
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//@ run-pass
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use std::cell::Cell;
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use std::cmp::Ordering;
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struct Evil<'a, 'b>(Cell<(&'a [i32], &'b [i32])>);
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impl PartialEq for Evil<'_, '_> {
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fn eq(&self, _other: &Self) -> bool {
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true
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}
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}
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impl Eq for Evil<'_, '_> {}
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impl PartialOrd for Evil<'_, '_> {
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fn partial_cmp(&self, _other: &Self) -> Option<Ordering> {
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Some(Ordering::Equal)
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}
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}
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impl<'a> Ord for Evil<'a, 'a> {
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fn cmp(&self, _other: &Self) -> Ordering {
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let (a, b) = self.0.get();
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self.0.set((b, a));
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Ordering::Equal
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}
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}
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fn main() {
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let x = &[1, 2, 3, 4];
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let u = {
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let a = Box::new([7, 8, 9, 10]);
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let y = [Evil(Cell::new((x, &*a)))];
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let _ = &y[..] <= &y[..];
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let [Evil(c)] = y;
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c.get().0
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};
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assert_eq!(u, &[1, 2, 3, 4]);
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}
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