30 lines
1.0 KiB
Rust
30 lines
1.0 KiB
Rust
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// Regression test for https://github.com/rust-lang/rust/issues/122549
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// was fixed by https://github.com/rust-lang/rust/pull/122749
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trait ConstChunksExactTrait<T> {
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fn const_chunks_exact<const N: usize>(&self) -> ConstChunksExact<'a, T, { N }>;
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//~^ ERROR undeclared lifetime
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}
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impl<T> ConstChunksExactTrait<T> for [T] {}
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//~^ ERROR not all trait items implemented, missing: `const_chunks_exact`
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struct ConstChunksExact<'rem, T: 'a, const N: usize> {}
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//~^ ERROR use of undeclared lifetime name `'a`
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//~^^ ERROR lifetime parameter
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//~^^^ ERROR type parameter
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impl<'a, T, const N: usize> Iterator for ConstChunksExact<'a, T, {}> {
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//~^ ERROR the const parameter `N` is not constrained by the impl trait, self type, or predicates
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//~^^ ERROR mismatched types
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type Item = &'a [T; N];
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}
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fn main() {
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let slice = &[1i32, 2, 3, 4, 5, 6, 7, 8, 9, 10];
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let mut iter = [[1, 2, 3], [4, 5, 6], [7, 8, 9]].iter();
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for a in slice.const_chunks_exact::<3>() {
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assert_eq!(a, iter.next().unwrap());
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}
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}
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