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Add ptr::Pointee trait (for all types) and ptr::metadata function

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RFC: https://github.com/rust-lang/rfcs/pull/2580
This commit is contained in:
Simon Sapin 2020-10-19 15:38:11 +02:00
parent 9503ea19ed
commit 696b239f72
17 changed files with 349 additions and 10 deletions
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15
compiler/rustc_typeck/src/coherence/mod.rs
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@ -48,7 +48,20 @@ fn enforce_trait_manually_implementable(
let did = Some(trait_def_id);
let li = tcx.lang_items();
// Disallow *all* explicit impls of `DiscriminantKind`, `Sized` and `Unsize` for now.
// Disallow *all* explicit impls of `Pointee`, `DiscriminantKind`, `Sized` and `Unsize` for now.
if did == li.pointee_trait() {
let span = impl_header_span(tcx, impl_def_id);
struct_span_err!(
tcx.sess,
span,
E0322,
"explicit impls for the `Pointee` trait are not permitted"
)
.span_label(span, "impl of 'Pointee' not allowed")
.emit();
return;
}
if did == li.discriminant_kind_trait() {
let span = impl_header_span(tcx, impl_def_id);
struct_span_err!(