bjoernager/rust
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Typecheck dyn* coercions

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Also changes things to treat dyn* as a sized type, unlike dyn Trait.
This commit is contained in:
Eric Holk 2022-04-13 16:38:16 -07:00
parent 6c01273a15
commit 7fccac3ea0
11 changed files with 148 additions and 29 deletions
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12
compiler/rustc_middle/src/ty/sty.rs
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@ -31,7 +31,7 @@ use ty::util::IntTypeExt;
use rustc_type_ir::sty::TyKind::*;
use rustc_type_ir::RegionKind as IrRegionKind;
use rustc_type_ir::TyKind as IrTyKind;
use rustc_type_ir::{TraitObjectRepresentation, TyKind as IrTyKind};
// Re-export the `TyKind` from `rustc_type_ir` here for convenience
#[rustc_diagnostic_item = "TyKind"]
@ -692,6 +692,9 @@ impl<'tcx> ExistentialPredicate<'tcx> {
}
impl<'tcx> Binder<'tcx, ExistentialPredicate<'tcx>> {
/// Given an existential predicate like `?Self: PartialEq<u32>` (e.g., derived from `dyn PartialEq<u32>`),
/// and a concrete type `self_ty`, returns a full predicate where the existentially quantified variable `?Self`
/// has been replaced with `self_ty` (e.g., `self_ty: PartialEq<u32>`, in our example).
pub fn with_self_ty(&self, tcx: TyCtxt<'tcx>, self_ty: Ty<'tcx>) -> ty::Predicate<'tcx> {
use crate::ty::ToPredicate;
match self.skip_binder() {
@ -1849,7 +1852,12 @@ impl<'tcx> Ty<'tcx> {
#[inline]
pub fn is_trait(self) -> bool {
matches!(self.kind(), Dynamic(..))
matches!(self.kind(), Dynamic(_, _, TraitObjectRepresentation::Unsized))
}
#[inline]
pub fn is_dyn_star(self) -> bool {
matches!(self.kind(), Dynamic(_, _, TraitObjectRepresentation::Sized))
}
#[inline]