bjoernager/rust
bjoernager/rust
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initial revert

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This commit is contained in:
Ellen 2022-01-12 03:19:52 +00:00
parent b0ec3e09a9
commit 71bbb603f4
127 changed files with 540 additions and 1050 deletions
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38
compiler/rustc_trait_selection/src/traits/object_safety.rs
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@ -274,7 +274,7 @@ fn predicate_references_self<'tcx>(
(predicate, sp): (ty::Predicate<'tcx>, Span),
) -> Option<Span> {
let self_ty = tcx.types.self_param;
let has_self_ty = |arg: &GenericArg<'tcx>| arg.walk(tcx).any(|arg| arg == self_ty.into());
let has_self_ty = |arg: &GenericArg<'_>| arg.walk().any(|arg| arg == self_ty.into());
match predicate.kind().skip_binder() {
ty::PredicateKind::Trait(ref data) => {
// In the case of a trait predicate, we can skip the "self" type.
@ -768,9 +768,6 @@ fn contains_illegal_self_type_reference<'tcx, T: TypeFoldable<'tcx>>(
impl<'tcx> TypeVisitor<'tcx> for IllegalSelfTypeVisitor<'tcx> {
type BreakTy = ();
fn tcx_for_anon_const_substs(&self) -> Option<TyCtxt<'tcx>> {
Some(self.tcx)
}
fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
match t.kind() {
@ -816,10 +813,9 @@ fn contains_illegal_self_type_reference<'tcx, T: TypeFoldable<'tcx>>(
}
}
fn visit_unevaluated_const(
&mut self,
uv: ty::Unevaluated<'tcx>,
) -> ControlFlow<Self::BreakTy> {
fn visit_const(&mut self, ct: &'tcx ty::Const<'tcx>) -> ControlFlow<Self::BreakTy> {
self.visit_ty(ct.ty)?;
// Constants can only influence object safety if they reference `Self`.
// This is only possible for unevaluated constants, so we walk these here.
//
@ -833,7 +829,7 @@ fn contains_illegal_self_type_reference<'tcx, T: TypeFoldable<'tcx>>(
// This shouldn't really matter though as we can't really use any
// constants which are not considered const evaluatable.
use rustc_middle::thir::abstract_const::Node;
if let Ok(Some(ct)) = AbstractConst::new(self.tcx, uv.shrink()) {
if let Ok(Some(ct)) = AbstractConst::from_const(self.tcx, ct) {
const_evaluatable::walk_abstract_const(self.tcx, ct, |node| {
match node.root(self.tcx) {
Node::Leaf(leaf) => self.visit_const(leaf),
@ -847,6 +843,30 @@ fn contains_illegal_self_type_reference<'tcx, T: TypeFoldable<'tcx>>(
ControlFlow::CONTINUE
}
}
fn visit_predicate(&mut self, pred: ty::Predicate<'tcx>) -> ControlFlow<Self::BreakTy> {
if let ty::PredicateKind::ConstEvaluatable(def, substs) = pred.kind().skip_binder() {
// FIXME(generic_const_exprs): We should probably deduplicate the logic for
// `AbstractConst`s here, it might make sense to change `ConstEvaluatable` to
// take a `ty::Const` instead.
use rustc_middle::thir::abstract_const::Node;
if let Ok(Some(ct)) = AbstractConst::new(self.tcx, def, substs) {
const_evaluatable::walk_abstract_const(self.tcx, ct, |node| {
match node.root(self.tcx) {
Node::Leaf(leaf) => self.visit_const(leaf),
Node::Cast(_, _, ty) => self.visit_ty(ty),
Node::Binop(..) | Node::UnaryOp(..) | Node::FunctionCall(_, _) => {
ControlFlow::CONTINUE
}
}
})
} else {
ControlFlow::CONTINUE
}
} else {
pred.super_visit_with(self)
}
}
}
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