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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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2
compiler/rustc_hir/src/lang_items.rs
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@@ -165,6 +165,8 @@ pub fn extract(attrs: &[impl AttributeExt]) -> Option<(Symbol, Span)> {
language_item_table! {
// Variant name, Name, Getter method name, Target Generic requirements;
Sized, sym::sized, sized_trait, Target::Trait, GenericRequirement::Exact(0);
MetaSized, sym::meta_sized, meta_sized_trait, Target::Trait, GenericRequirement::Exact(0);
PointeeSized, sym::pointee_sized, pointee_sized_trait, Target::Trait, GenericRequirement::Exact(0);
Unsize, sym::unsize, unsize_trait, Target::Trait, GenericRequirement::Minimum(1);
/// Trait injected by `#[derive(PartialEq)]`, (i.e. "Partial EQ").
StructuralPeq, sym::structural_peq, structural_peq_trait, Target::Trait, GenericRequirement::None;