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As a performance optimization, skip elaborating the supertraits of `Sized`, and if a `MetaSized` obligation is being checked, then look for a `Sized` predicate in the parameter environment. This makes the `ParamEnv` smaller which should improve compiler performance as it avoids all the iteration over the larger `ParamEnv`.
19 lines
408 B
Rust
19 lines
408 B
Rust
//@ check-pass
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//@ compile-flags: --crate-type=lib
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//@ revisions: old next
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//@[next] compile-flags: -Znext-solver
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#![feature(sized_hierarchy)]
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use std::marker::{PhantomData, MetaSized, PointeeSized};
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struct Foo<'a, T: PointeeSized>(PhantomData<&'a T>, T);
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fn requires_metasized<T: MetaSized>() {}
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fn foo<'a, T: 'a + PointeeSized>()
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where
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Foo<'a, T>: Sized
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{
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requires_metasized::<Foo<'_, T>>();
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}
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