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48 lines
1.6 KiB
Rust
48 lines
1.6 KiB
Rust
#![feature(generic_const_exprs)]
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#![allow(incomplete_features)]
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trait Trait {}
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pub struct EvaluatableU128<const N: u128>;
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struct HasCastInTraitImpl<const N: usize, const M: u128>;
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impl<const O: usize> Trait for HasCastInTraitImpl<O, { O as u128 }> {}
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pub fn use_trait_impl<const N: usize>()
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where
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[(); { N + 1}]:,
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EvaluatableU128<{N as u128}>:, {
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fn assert_impl<T: Trait>() {}
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// errors are bad but seems to be pre-existing issue #86198
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assert_impl::<HasCastInTraitImpl<{ N + 1 }, { N as u128 }>>();
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//~^ Error: mismatched types
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//~^^ Error: unconstrained generic constant
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assert_impl::<HasCastInTraitImpl<{ N + 1 }, { N as _ }>>();
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//~^ Error: mismatched types
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//~^^ Error: unconstrained generic constant
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assert_impl::<HasCastInTraitImpl<13, { 12 as u128 }>>();
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//~^ Error: mismatched types
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assert_impl::<HasCastInTraitImpl<14, 13>>();
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//~^ Error: mismatched types
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}
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pub fn use_trait_impl_2<const N: usize>()
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where
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[(); { N + 1}]:,
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EvaluatableU128<{N as _}>:, {
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fn assert_impl<T: Trait>() {}
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// errors are bad but seems to be pre-existing issue #86198
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assert_impl::<HasCastInTraitImpl<{ N + 1 }, { N as u128 }>>();
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//~^ Error: mismatched types
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//~^^ Error: unconstrained generic constant
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assert_impl::<HasCastInTraitImpl<{ N + 1 }, { N as _ }>>();
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//~^ Error: mismatched types
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//~^^ Error: unconstrained generic constant
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assert_impl::<HasCastInTraitImpl<13, { 12 as u128 }>>();
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//~^ Error: mismatched types
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assert_impl::<HasCastInTraitImpl<14, 13>>();
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//~^ Error: mismatched types
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}
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fn main() {}
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