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https://github.com/rust-lang/rust
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25 lines
592 B
Rust
25 lines
592 B
Rust
//@ check-pass
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//@ revisions: current next
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//@ ignore-compare-mode-next-solver (explicit revisions)
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//@[next] compile-flags: -Znext-solver
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// Tests that rebasing from the concrete impl to the default impl also processes the
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// `[u32; 0]: IntoIterator<Item = ?U>` predicate to constrain the `?U` impl arg.
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#![feature(specialization)]
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//~^ WARN the feature `specialization` is incomplete
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trait Spec {
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type Assoc;
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}
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default impl<T, U> Spec for T where T: IntoIterator<Item = U> {
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type Assoc = U;
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}
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impl<T> Spec for [T; 0] {}
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fn main() {
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let x: <[u32; 0] as Spec>::Assoc = 1;
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}
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