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trait_sel: {Meta,Pointee}Sized on Sized types

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Introduce the `MetaSized` and `PointeeSized` traits as supertraits of
`Sized` and initially implement it on everything that currently
implements `Sized` to isolate any changes that simply adding the
traits introduces.
This commit is contained in:
David Wood
2025-01-16 11:30:39 +00:00
parent d9ca9bd014
commit d43da6f4de
15 changed files with 253 additions and 1 deletions
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30
compiler/rustc_next_trait_solver/src/solve/trait_goals.rs
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@@ -260,6 +260,36 @@ where
)
}
fn consider_builtin_meta_sized_candidate(
ecx: &mut EvalCtxt<'_, D>,
goal: Goal<I, Self>,
) -> Result<Candidate<I>, NoSolution> {
if goal.predicate.polarity != ty::PredicatePolarity::Positive {
return Err(NoSolution);
}
ecx.probe_and_evaluate_goal_for_constituent_tys(
CandidateSource::BuiltinImpl(BuiltinImplSource::Misc),
goal,
structural_traits::instantiate_constituent_tys_for_sized_trait,
)
}
fn consider_builtin_pointee_sized_candidate(
ecx: &mut EvalCtxt<'_, D>,
goal: Goal<I, Self>,
) -> Result<Candidate<I>, NoSolution> {
if goal.predicate.polarity != ty::PredicatePolarity::Positive {
return Err(NoSolution);
}
ecx.probe_and_evaluate_goal_for_constituent_tys(
CandidateSource::BuiltinImpl(BuiltinImplSource::Misc),
goal,
structural_traits::instantiate_constituent_tys_for_sized_trait,
)
}
fn consider_builtin_copy_clone_candidate(
ecx: &mut EvalCtxt<'_, D>,
goal: Goal<I, Self>,