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add AliasEq to PredicateKind

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This commit is contained in:
Boxy 2023-02-10 13:43:29 +00:00
parent 9b8dbd558c
commit 23ab2464be
25 changed files with 80 additions and 5 deletions
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1
compiler/rustc_hir_analysis/src/astconv/mod.rs
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@ -1328,6 +1328,7 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
ty::Clause::RegionOutlives(_) => bug!(),
},
ty::PredicateKind::WellFormed(_)
| ty::PredicateKind::AliasEq(..)
| ty::PredicateKind::ObjectSafe(_)
| ty::PredicateKind::ClosureKind(_, _, _)
| ty::PredicateKind::Subtype(_)

1
compiler/rustc_hir_analysis/src/impl_wf_check/min_specialization.rs
View File

@ -517,6 +517,7 @@ fn trait_predicate_kind<'tcx>(
ty::PredicateKind::Clause(ty::Clause::RegionOutlives(_))
| ty::PredicateKind::Clause(ty::Clause::TypeOutlives(_))
| ty::PredicateKind::Clause(ty::Clause::Projection(_))
| ty::PredicateKind::AliasEq(..)
| ty::PredicateKind::WellFormed(_)
| ty::PredicateKind::Subtype(_)
| ty::PredicateKind::Coerce(_)

1
compiler/rustc_hir_analysis/src/outlives/explicit.rs
View File

@ -55,6 +55,7 @@ impl<'tcx> ExplicitPredicatesMap<'tcx> {
ty::PredicateKind::Clause(ty::Clause::Trait(..))
| ty::PredicateKind::Clause(ty::Clause::Projection(..))
| ty::PredicateKind::WellFormed(..)
| ty::PredicateKind::AliasEq(..)
| ty::PredicateKind::ObjectSafe(..)
| ty::PredicateKind::ClosureKind(..)
| ty::PredicateKind::Subtype(..)

1
compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs
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@ -669,6 +669,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
| ty::PredicateKind::Clause(ty::Clause::TypeOutlives(..))
| ty::PredicateKind::WellFormed(..)
| ty::PredicateKind::ObjectSafe(..)
| ty::PredicateKind::AliasEq(..)
| ty::PredicateKind::ConstEvaluatable(..)
| ty::PredicateKind::ConstEquate(..)
// N.B., this predicate is created by breaking down a

1
compiler/rustc_hir_typeck/src/method/probe.rs
View File

@ -837,6 +837,7 @@ impl<'a, 'tcx> ProbeContext<'a, 'tcx> {
| ty::PredicateKind::ConstEvaluatable(..)
| ty::PredicateKind::ConstEquate(..)
| ty::PredicateKind::Ambiguous
| ty::PredicateKind::AliasEq(..)
| ty::PredicateKind::TypeWellFormedFromEnv(..) => None,
}
});

1
compiler/rustc_infer/src/infer/outlives/mod.rs
View File

@ -21,6 +21,7 @@ pub fn explicit_outlives_bounds<'tcx>(
.filter_map(move |kind| match kind {
ty::PredicateKind::Clause(ty::Clause::Projection(..))
| ty::PredicateKind::Clause(ty::Clause::Trait(..))
| ty::PredicateKind::AliasEq(..)
| ty::PredicateKind::Coerce(..)
| ty::PredicateKind::Subtype(..)
| ty::PredicateKind::WellFormed(..)

3
compiler/rustc_infer/src/traits/util.rs
View File

@ -294,6 +294,9 @@ impl<'tcx> Elaborator<'tcx> {
// Nothing to elaborate
}
ty::PredicateKind::Ambiguous => {}
ty::PredicateKind::AliasEq(..) => {
// No
}
}
}
}

2
compiler/rustc_lint/src/builtin.rs
View File

@ -1594,12 +1594,14 @@ impl<'tcx> LateLintPass<'tcx> for TrivialConstraints {
// Ignore projections, as they can only be global
// if the trait bound is global
Clause(Clause::Projection(..)) |
AliasEq(..) |
// Ignore bounds that a user can't type
WellFormed(..) |
ObjectSafe(..) |
ClosureKind(..) |
Subtype(..) |
Coerce(..) |
// FIXME(generic_const_exprs): `ConstEvaluatable` can be written
ConstEvaluatable(..) |
ConstEquate(..) |
Ambiguous |

16
compiler/rustc_middle/src/ty/flags.rs
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@ -264,10 +264,7 @@ impl FlagComputation {
term,
})) => {
self.add_projection_ty(projection_ty);
match term.unpack() {
ty::TermKind::Ty(ty) => self.add_ty(ty),
ty::TermKind::Const(c) => self.add_const(c),
}
self.add_term(term);
}
ty::PredicateKind::WellFormed(arg) => {
self.add_substs(slice::from_ref(&arg));
@ -287,6 +284,10 @@ impl FlagComputation {
self.add_ty(ty);
}
ty::PredicateKind::Ambiguous => {}
ty::PredicateKind::AliasEq(t1, t2) => {
self.add_term(t1);
self.add_term(t2);
}
}
}
@ -380,4 +381,11 @@ impl FlagComputation {
}
}
}
fn add_term(&mut self, term: ty::Term<'_>) {
match term.unpack() {
ty::TermKind::Ty(ty) => self.add_ty(ty),
ty::TermKind::Const(ct) => self.add_const(ct),
}
}
}

10
compiler/rustc_middle/src/ty/mod.rs
View File

@ -545,6 +545,7 @@ impl<'tcx> Predicate<'tcx> {
| PredicateKind::Clause(Clause::RegionOutlives(_))
| PredicateKind::Clause(Clause::TypeOutlives(_))
| PredicateKind::Clause(Clause::Projection(_))
| PredicateKind::AliasEq(..)
| PredicateKind::ObjectSafe(_)
| PredicateKind::ClosureKind(_, _, _)
| PredicateKind::Subtype(_)
@ -632,6 +633,12 @@ pub enum PredicateKind<'tcx> {
/// A marker predicate that is always ambiguous.
/// Used for coherence to mark opaque types as possibly equal to each other but ambiguous.
Ambiguous,
/// Separate from `Clause::Projection` which is used for normalization in new solver.
/// This predicate requires two terms to be equal to eachother.
///
/// Only used for new solver
AliasEq(Term<'tcx>, Term<'tcx>),
}
/// The crate outlives map is computed during typeck and contains the
@ -1152,6 +1159,7 @@ impl<'tcx> Predicate<'tcx> {
match predicate.skip_binder() {
PredicateKind::Clause(Clause::Trait(t)) => Some(predicate.rebind(t)),
PredicateKind::Clause(Clause::Projection(..))
| PredicateKind::AliasEq(..)
| PredicateKind::Subtype(..)
| PredicateKind::Coerce(..)
| PredicateKind::Clause(Clause::RegionOutlives(..))
@ -1171,6 +1179,7 @@ impl<'tcx> Predicate<'tcx> {
match predicate.skip_binder() {
PredicateKind::Clause(Clause::Projection(t)) => Some(predicate.rebind(t)),
PredicateKind::Clause(Clause::Trait(..))
| PredicateKind::AliasEq(..)
| PredicateKind::Subtype(..)
| PredicateKind::Coerce(..)
| PredicateKind::Clause(Clause::RegionOutlives(..))
@ -1191,6 +1200,7 @@ impl<'tcx> Predicate<'tcx> {
PredicateKind::Clause(Clause::TypeOutlives(data)) => Some(predicate.rebind(data)),
PredicateKind::Clause(Clause::Trait(..))
| PredicateKind::Clause(Clause::Projection(..))
| PredicateKind::AliasEq(..)
| PredicateKind::Subtype(..)
| PredicateKind::Coerce(..)
| PredicateKind::Clause(Clause::RegionOutlives(..))

1
compiler/rustc_middle/src/ty/print/pretty.rs
View File

@ -2841,6 +2841,7 @@ define_print_and_forward_display! {
p!("the type `", print(ty), "` is found in the environment")
}
ty::PredicateKind::Ambiguous => p!("ambiguous"),
ty::PredicateKind::AliasEq(t1, t2) => p!(print(t1), " == ", print(t2)),
}
}

1
compiler/rustc_middle/src/ty/structural_impls.rs
View File

@ -177,6 +177,7 @@ impl<'tcx> fmt::Debug for ty::PredicateKind<'tcx> {
write!(f, "TypeWellFormedFromEnv({:?})", ty)
}
ty::PredicateKind::Ambiguous => write!(f, "Ambiguous"),
ty::PredicateKind::AliasEq(t1, t2) => write!(f, "AliasEq({t1:?}, {t2:?})"),
}
}
}

5
compiler/rustc_trait_selection/src/solve/fulfill.rs
View File

@ -73,6 +73,11 @@ impl<'tcx> TraitEngine<'tcx> for FulfillmentCtxt<'tcx> {
MismatchedProjectionTypes { err: TypeError::Mismatch },
)
}
ty::PredicateKind::AliasEq(_, _) => {
FulfillmentErrorCode::CodeProjectionError(
MismatchedProjectionTypes { err: TypeError::Mismatch },
)
}
ty::PredicateKind::Subtype(pred) => {
let (a, b) = infcx.instantiate_binder_with_placeholders(
goal.predicate.kind().rebind((pred.a, pred.b)),

4
compiler/rustc_trait_selection/src/solve/mod.rs
View File

@ -302,6 +302,10 @@ impl<'a, 'tcx> EvalCtxt<'a, 'tcx> {
ty::PredicateKind::TypeWellFormedFromEnv(..) => {
bug!("TypeWellFormedFromEnv is only used for Chalk")
}
ty::PredicateKind::AliasEq(..) => {
// FIXME(deferred_projection_equality)
todo!()
}
}
} else {
let kind = self.infcx.instantiate_binder_with_placeholders(kind);

3
compiler/rustc_trait_selection/src/traits/auto_trait.rs
View File

@ -823,14 +823,17 @@ impl<'tcx> AutoTraitFinder<'tcx> {
_ => return false,
}
}
// There's not really much we can do with these predicates -
// we start out with a `ParamEnv` with no inference variables,
// and these don't correspond to adding any new bounds to
// the `ParamEnv`.
ty::PredicateKind::WellFormed(..)
| ty::PredicateKind::AliasEq(..)
| ty::PredicateKind::ObjectSafe(..)
| ty::PredicateKind::ClosureKind(..)
| ty::PredicateKind::Subtype(..)
// FIXME(generic_const_exprs): you can absolutely add this as a where clauses
| ty::PredicateKind::ConstEvaluatable(..)
| ty::PredicateKind::Coerce(..)
| ty::PredicateKind::TypeWellFormedFromEnv(..) => {}

5
compiler/rustc_trait_selection/src/traits/error_reporting/mod.rs
View File

@ -1278,6 +1278,11 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
span,
"TypeWellFormedFromEnv predicate should only exist in the environment"
),
ty::PredicateKind::AliasEq(..) => span_bug!(
span,
"AliasEq predicate should never be the predicate cause of a SelectionError"
),
}
}

6
compiler/rustc_trait_selection/src/traits/fulfill.rs
View File

@ -328,6 +328,9 @@ impl<'a, 'tcx> ObligationProcessor for FulfillProcessor<'a, 'tcx> {
ty::PredicateKind::TypeWellFormedFromEnv(..) => {
bug!("TypeWellFormedFromEnv is only used for Chalk")
}
ty::PredicateKind::AliasEq(..) => {
bug!("AliasEq is only used for new solver")
}
},
Some(pred) => match pred {
ty::PredicateKind::Clause(ty::Clause::Trait(data)) => {
@ -594,6 +597,9 @@ impl<'a, 'tcx> ObligationProcessor for FulfillProcessor<'a, 'tcx> {
ty::PredicateKind::TypeWellFormedFromEnv(..) => {
bug!("TypeWellFormedFromEnv is only used for Chalk")
}
ty::PredicateKind::AliasEq(..) => {
bug!("AliasEq is only used for new solver")
}
},
}
}

4
compiler/rustc_trait_selection/src/traits/object_safety.rs
View File

@ -327,6 +327,8 @@ fn predicate_references_self<'tcx>(
// possible alternatives.
if data.projection_ty.substs[1..].iter().any(has_self_ty) { Some(sp) } else { None }
}
ty::PredicateKind::AliasEq(..) => bug!("`AliasEq` not allowed as assumption"),
ty::PredicateKind::WellFormed(..)
| ty::PredicateKind::ObjectSafe(..)
| ty::PredicateKind::Clause(ty::Clause::TypeOutlives(..))
@ -334,6 +336,7 @@ fn predicate_references_self<'tcx>(
| ty::PredicateKind::ClosureKind(..)
| ty::PredicateKind::Subtype(..)
| ty::PredicateKind::Coerce(..)
// FIXME(generic_const_exprs): this can mention `Self`
| ty::PredicateKind::ConstEvaluatable(..)
| ty::PredicateKind::ConstEquate(..)
| ty::PredicateKind::Ambiguous
@ -368,6 +371,7 @@ fn generics_require_sized_self(tcx: TyCtxt<'_>, def_id: DefId) -> bool {
| ty::PredicateKind::Clause(ty::Clause::TypeOutlives(..))
| ty::PredicateKind::ConstEvaluatable(..)
| ty::PredicateKind::ConstEquate(..)
| ty::PredicateKind::AliasEq(..)
| ty::PredicateKind::Ambiguous
| ty::PredicateKind::TypeWellFormedFromEnv(..) => false,
}

3
compiler/rustc_trait_selection/src/traits/select/mod.rs
View File

@ -991,6 +991,9 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
ty::PredicateKind::TypeWellFormedFromEnv(..) => {
bug!("TypeWellFormedFromEnv is only used for chalk")
}
ty::PredicateKind::AliasEq(..) => {
bug!("AliasEq is only used for new solver")
}
ty::PredicateKind::Ambiguous => Ok(EvaluatedToAmbig),
}
})

4
compiler/rustc_trait_selection/src/traits/wf.rs
View File

@ -187,6 +187,9 @@ pub fn predicate_obligations<'tcx>(
ty::PredicateKind::TypeWellFormedFromEnv(..) => {
bug!("TypeWellFormedFromEnv is only used for Chalk")
}
ty::PredicateKind::AliasEq(..) => {
bug!("We should only wf check where clauses and `AliasEq` is not a `Clause`")
}
}
wf.normalize(infcx)
@ -928,6 +931,7 @@ pub(crate) fn required_region_bounds<'tcx>(
| ty::PredicateKind::ConstEvaluatable(..)
| ty::PredicateKind::ConstEquate(..)
| ty::PredicateKind::Ambiguous
| ty::PredicateKind::AliasEq(..)
| ty::PredicateKind::TypeWellFormedFromEnv(..) => None,
ty::PredicateKind::Clause(ty::Clause::TypeOutlives(ty::OutlivesPredicate(
ref t,

4
compiler/rustc_traits/src/chalk/lowering.rs
View File

@ -116,6 +116,7 @@ impl<'tcx> LowerInto<'tcx, chalk_ir::InEnvironment<chalk_ir::Goal<RustInterner<'
)),
},
ty::PredicateKind::ObjectSafe(..)
| ty::PredicateKind::AliasEq(..)
| ty::PredicateKind::ClosureKind(..)
| ty::PredicateKind::Subtype(..)
| ty::PredicateKind::Coerce(..)
@ -210,6 +211,7 @@ impl<'tcx> LowerInto<'tcx, chalk_ir::GoalData<RustInterner<'tcx>>> for ty::Predi
// We can defer this, but ultimately we'll want to express
// some of these in terms of chalk operations.
ty::PredicateKind::ClosureKind(..)
| ty::PredicateKind::AliasEq(..)
| ty::PredicateKind::Coerce(..)
| ty::PredicateKind::ConstEvaluatable(..)
| ty::PredicateKind::Ambiguous
@ -642,6 +644,7 @@ impl<'tcx> LowerInto<'tcx, Option<chalk_ir::QuantifiedWhereClause<RustInterner<'
ty::PredicateKind::WellFormed(_ty) => None,
ty::PredicateKind::ObjectSafe(..)
| ty::PredicateKind::AliasEq(..)
| ty::PredicateKind::ClosureKind(..)
| ty::PredicateKind::Subtype(..)
| ty::PredicateKind::Coerce(..)
@ -775,6 +778,7 @@ impl<'tcx> LowerInto<'tcx, Option<chalk_solve::rust_ir::QuantifiedInlineBound<Ru
ty::PredicateKind::WellFormed(_ty) => None,
ty::PredicateKind::Clause(ty::Clause::RegionOutlives(..))
| ty::PredicateKind::AliasEq(..)
| ty::PredicateKind::ObjectSafe(..)
| ty::PredicateKind::ClosureKind(..)
| ty::PredicateKind::Subtype(..)

4
compiler/rustc_traits/src/implied_outlives_bounds.rs
View File

@ -85,7 +85,8 @@ fn compute_implied_outlives_bounds<'tcx>(
// learn anything new from those.
if obligation.predicate.has_non_region_infer() {
match obligation.predicate.kind().skip_binder() {
ty::PredicateKind::Clause(ty::Clause::Projection(..)) => {
ty::PredicateKind::Clause(ty::Clause::Projection(..))
| ty::PredicateKind::AliasEq(..) => {
ocx.register_obligation(obligation.clone());
}
_ => {}
@ -106,6 +107,7 @@ fn compute_implied_outlives_bounds<'tcx>(
| ty::PredicateKind::ConstEvaluatable(..)
| ty::PredicateKind::ConstEquate(..)
| ty::PredicateKind::Ambiguous
| ty::PredicateKind::AliasEq(..)
| ty::PredicateKind::TypeWellFormedFromEnv(..) => {}
// We need to search through *all* WellFormed predicates

1
compiler/rustc_traits/src/normalize_erasing_regions.rs
View File

@ -60,6 +60,7 @@ fn not_outlives_predicate(p: ty::Predicate<'_>) -> bool {
| ty::PredicateKind::Clause(ty::Clause::TypeOutlives(..)) => false,
ty::PredicateKind::Clause(ty::Clause::Trait(..))
| ty::PredicateKind::Clause(ty::Clause::Projection(..))
| ty::PredicateKind::AliasEq(..)
| ty::PredicateKind::WellFormed(..)
| ty::PredicateKind::ObjectSafe(..)
| ty::PredicateKind::ClosureKind(..)

2
src/librustdoc/clean/mod.rs
View File

@ -310,10 +310,12 @@ pub(crate) fn clean_predicate<'tcx>(
ty::PredicateKind::Clause(ty::Clause::Projection(pred)) => {
Some(clean_projection_predicate(bound_predicate.rebind(pred), cx))
}
// FIXME(generic_const_exprs): should this do something?
ty::PredicateKind::ConstEvaluatable(..) => None,
ty::PredicateKind::WellFormed(..) => None,
ty::PredicateKind::Subtype(..)
| ty::PredicateKind::AliasEq(..)
| ty::PredicateKind::Coerce(..)
| ty::PredicateKind::ObjectSafe(..)
| ty::PredicateKind::ClosureKind(..)

1
src/tools/clippy/clippy_utils/src/qualify_min_const_fn.rs
View File

@ -36,6 +36,7 @@ pub fn is_min_const_fn<'tcx>(tcx: TyCtxt<'tcx>, body: &Body<'tcx>, msrv: &Msrv)
| ty::PredicateKind::ConstEvaluatable(..)
| ty::PredicateKind::ConstEquate(..)
| ty::PredicateKind::TypeWellFormedFromEnv(..) => continue,
ty::PredicateKind::AliasEq(..) => panic!("alias eq predicate on function: {predicate:#?}"),
ty::PredicateKind::ObjectSafe(_) => panic!("object safe predicate on function: {predicate:#?}"),
ty::PredicateKind::ClosureKind(..) => panic!("closure kind predicate on function: {predicate:#?}"),
ty::PredicateKind::Subtype(_) => panic!("subtype predicate on function: {predicate:#?}"),