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Auto merge of #118133 - Urgau:stabilize_trait_upcasting, r=WaffleLapkin

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Stabilize RFC3324 dyn upcasting coercion

This PR stabilize the `trait_upcasting` feature, aka https://github.com/rust-lang/rfcs/pull/3324.

The FCP was completed here: https://github.com/rust-lang/rust/issues/65991#issuecomment-1817552398.

~~And also remove the `deref_into_dyn_supertrait` lint which is now handled by dyn upcasting coercion.~~

Heavily inspired by https://github.com/rust-lang/rust/pull/101718
Fixes https://github.com/rust-lang/rust/issues/65991
This commit is contained in:
bors 2023-11-22 16:15:34 +00:00
commit 6d2b84b3ed
69 changed files with 107 additions and 357 deletions
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6
compiler/rustc_lint/src/lints.rs
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@ -10,9 +10,7 @@ use rustc_errors::{
};
use rustc_hir::def_id::DefId;
use rustc_macros::{LintDiagnostic, Subdiagnostic};
use rustc_middle::ty::{
inhabitedness::InhabitedPredicate, Clause, PolyExistentialTraitRef, Ty, TyCtxt,
};
use rustc_middle::ty::{inhabitedness::InhabitedPredicate, Clause, Ty, TyCtxt};
use rustc_session::parse::ParseSess;
use rustc_span::{edition::Edition, sym, symbol::Ident, Span, Symbol};
@ -556,9 +554,9 @@ pub enum BuiltinSpecialModuleNameUsed {
// deref_into_dyn_supertrait.rs
#[derive(LintDiagnostic)]
#[diag(lint_supertrait_as_deref_target)]
#[help]
pub struct SupertraitAsDerefTarget<'a> {
pub t: Ty<'a>,
pub target_principal: PolyExistentialTraitRef<'a>,
#[subdiagnostic]
pub label: Option<SupertraitAsDerefTargetLabel>,
}