8d64937dc2
As a temporary measure while a proper fix for `tests/ui/sized-hierarchy/incomplete-inference-issue-143992.rs` is implemented, make `MetaSized` obligations always hold. In effect, temporarily reverting the `sized_hierarchy` feature. This is a small change that can be backported.
30 lines
778 B
Rust
30 lines
778 B
Rust
//@ compile-flags: --crate-type=lib
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//@ revisions: current next
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//@ ignore-compare-mode-next-solver (explicit revisions)
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//@[current] check-pass
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//@[next] compile-flags: -Znext-solver
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//@[next] check-fail
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// Test that we avoid incomplete inference when normalizing. Without this,
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// `Trait`'s implicit `MetaSized` supertrait requires proving `T::Assoc<_>: MetaSized`
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// before checking the `new` arguments, resulting in eagerly constraining the inference
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// var to `u32`. This is undesirable and would breaking code.
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pub trait Trait {
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type Assoc<G>: OtherTrait<G>;
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}
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pub trait OtherTrait<R> {
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fn new(r: R) -> R {
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r
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}
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}
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pub fn function<T: Trait>()
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where
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T::Assoc<[u32; 1]>: Clone,
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{
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let _x = T::Assoc::new(());
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//[next]~^ ERROR mismatched types
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}
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