mirror of https://github.com/rust-lang/rust.git
33 lines
763 B
Rust
33 lines
763 B
Rust
//@ known-bug: #121052
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#![feature(generic_const_exprs, with_negative_coherence)]
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use std::ops::Mul;
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pub trait Indices<const N: usize> {
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const NUM_ELEMS: usize;
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}
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impl<I: Indices<N>, J: Indices<N>, const N: usize> Mul for Tensor<I, N>
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where
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I: Concat<J>,
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<I as Concat<J>>::Output: Indices<N>,
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[u8; I::NUM_ELEMS]: Sized,
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[u8; J::NUM_ELEMS]: Sized,
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[u8; <I as Concat<J>>::Output::NUM_ELEMS]: Sized,
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{
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}
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pub trait Concat<J> {}
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pub struct Tensor<I: Indices<N>, const N: usize> {}
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impl<I: Indices<N>, J: Indices<N>, const N: usize> Mul for Tensor<I, N>
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where
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I: Concat<J>,
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<I as Concat<J>>::Output: Indices<N>,
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[u8; I::NUM_ELEMS]: Sized,
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[u8; J::NUM_ELEMS]: Sized,
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[u8; <I as Concat<J>>::Output::NUM_ELEMS]: Sized,
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{
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}
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