27 lines
470 B
Rust
27 lines
470 B
Rust
//@ known-bug: #136859
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#![feature(generic_const_exprs)]
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trait If<const COND: bool> {}
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impl If<true> for () {}
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trait IsZero<const N: u8> {
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type Answer;
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}
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struct True;
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struct False;
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impl<const N: u8> IsZero<N> for ()
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where (): If<{N == 0}> {
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type Msg = True;
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}
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trait Foobar<const N: u8> {}
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impl<const N: u8> Foobar<N> for ()
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where (): IsZero<N, Answer = True> {}
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impl<const N: u8> Foobar<{{ N }}> for ()
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where (): IsZero<N, Answer = False> {}
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fn main() {}
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