mirror of https://github.com/rust-lang/rust
38 lines
769 B
Rust
38 lines
769 B
Rust
#![feature(const_trait_impl, effects)]
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#![feature(generic_arg_infer)]
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#![feature(generic_const_exprs)]
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#![allow(incomplete_features)]
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struct Foo<const N: usize>;
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impl<const N: usize> Foo<N> {
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fn add<A: ~const Add42>(self) -> Foo<{ A::add(N) }> {
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//~^ ERROR `~const` is not allowed here
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//~| ERROR mismatched types
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Foo
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}
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}
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#[const_trait]
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trait Add42 {
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fn add(a: usize) -> usize;
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}
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impl const Add42 for () {
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fn add(a: usize) -> usize {
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a + 42
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}
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}
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fn bar<A: ~const Add42, const N: usize>(_: Foo<N>) -> Foo<{ A::add(N) }> {
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//~^ ERROR `~const` is not allowed here
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//~| ERROR mismatched types
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Foo
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}
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fn main() {
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let foo = Foo::<0>;
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let foo = bar::<(), _>(foo);
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let _foo = bar::<(), _>(foo);
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}
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