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32 lines
755 B
Rust
32 lines
755 B
Rust
// run-pass
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#![feature(generic_const_exprs)]
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#![allow(incomplete_features, unused_parens, unused_braces)]
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fn zero_init<const N: usize>() -> Substs1<{{ N }}>
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where
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[u8; {{ N }}]: ,
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{
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Substs1([0; {{ N }}])
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}
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struct Substs1<const N: usize>([u8; {{ N }}])
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where
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[(); {{ N }}]: ;
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fn substs2<const M: usize>() -> Substs1<{{ M }}> {
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zero_init::<{{ M }}>()
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}
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fn substs3<const L: usize>() -> Substs1<{{ L }}> {
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substs2::<{{ L }}>()
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}
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fn main() {
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assert_eq!(substs3::<2>().0, [0; 2]);
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}
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// Test that the implicit ``{{ L }}`` bound on ``substs3`` satisfies the
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// ``{{ N }}`` bound on ``Substs1``
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// FIXME(generic_const_exprs): come up with a less brittle test for this using assoc consts
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// once normalization is implemented for them.
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