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Auto merge of #122900 - matthiaskrgr:rollup-nls90mb, r=matthiaskrgr

Browse source 
Rollup of 8 pull requests

Successful merges:

 - #114009 (compiler: allow transmute of ZST arrays with generics)
 - #122195 (Note that the caller chooses a type for type param)
 - #122651 (Suggest `_` for missing generic arguments in turbofish)
 - #122784 (Add `tag_for_variant` query)
 - #122839 (Split out `PredicatePolarity` from `ImplPolarity`)
 - #122873 (Merge my contributor emails into one using mailmap)
 - #122885 (Adjust better spastorino membership to triagebot's adhoc_groups)
 - #122888 (add a couple more tests)

r? `@ghost`
`@rustbot` modify labels: rollup
This commit is contained in:
bors 2024-03-22 22:35:11 +00:00
commit 0ad5e0d2de
72 changed files with 777 additions and 425 deletions
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68
compiler/rustc_trait_selection/src/solve/trait_goals.rs
View file

@ -55,17 +55,23 @@ impl<'tcx> assembly::GoalKind<'tcx> for TraitPredicate<'tcx> {
// An upper bound of the certainty of this goal, used to lower the certainty
// of reservation impl to ambiguous during coherence.
let impl_polarity = impl_trait_header.polarity;
let maximal_certainty = match impl_polarity {
ty::ImplPolarity::Positive | ty::ImplPolarity::Negative => {
match impl_polarity == goal.predicate.polarity {
true => Certainty::Yes,
false => return Err(NoSolution),
}
}
ty::ImplPolarity::Reservation => match ecx.solver_mode() {
SolverMode::Normal => return Err(NoSolution),
let maximal_certainty = match (impl_polarity, goal.predicate.polarity) {
// In intercrate mode, this is ambiguous. But outside of intercrate,
// it's not a real impl.
(ty::ImplPolarity::Reservation, _) => match ecx.solver_mode() {
SolverMode::Coherence => Certainty::AMBIGUOUS,
SolverMode::Normal => return Err(NoSolution),
},
// Impl matches polarity
(ty::ImplPolarity::Positive, ty::PredicatePolarity::Positive)
| (ty::ImplPolarity::Negative, ty::PredicatePolarity::Negative) => Certainty::Yes,
// Impl doesn't match polarity
(ty::ImplPolarity::Positive, ty::PredicatePolarity::Negative)
| (ty::ImplPolarity::Negative, ty::PredicatePolarity::Positive) => {
return Err(NoSolution);
}
};
ecx.probe_trait_candidate(CandidateSource::Impl(impl_def_id)).enter(|ecx| {
@ -123,7 +129,7 @@ impl<'tcx> assembly::GoalKind<'tcx> for TraitPredicate<'tcx> {
ecx: &mut EvalCtxt<'_, 'tcx>,
goal: Goal<'tcx, Self>,
) -> QueryResult<'tcx> {
if goal.predicate.polarity != ty::ImplPolarity::Positive {
if goal.predicate.polarity != ty::PredicatePolarity::Positive {
return Err(NoSolution);
}
@ -168,7 +174,7 @@ impl<'tcx> assembly::GoalKind<'tcx> for TraitPredicate<'tcx> {
ecx: &mut EvalCtxt<'_, 'tcx>,
goal: Goal<'tcx, Self>,
) -> QueryResult<'tcx> {
if goal.predicate.polarity != ty::ImplPolarity::Positive {
if goal.predicate.polarity != ty::PredicatePolarity::Positive {
return Err(NoSolution);
}
@ -191,7 +197,7 @@ impl<'tcx> assembly::GoalKind<'tcx> for TraitPredicate<'tcx> {
ecx: &mut EvalCtxt<'_, 'tcx>,
goal: Goal<'tcx, Self>,
) -> QueryResult<'tcx> {
if goal.predicate.polarity != ty::ImplPolarity::Positive {
if goal.predicate.polarity != ty::PredicatePolarity::Positive {
return Err(NoSolution);
}
@ -205,7 +211,7 @@ impl<'tcx> assembly::GoalKind<'tcx> for TraitPredicate<'tcx> {
ecx: &mut EvalCtxt<'_, 'tcx>,
goal: Goal<'tcx, Self>,
) -> QueryResult<'tcx> {
if goal.predicate.polarity != ty::ImplPolarity::Positive {
if goal.predicate.polarity != ty::PredicatePolarity::Positive {
return Err(NoSolution);
}
@ -219,7 +225,7 @@ impl<'tcx> assembly::GoalKind<'tcx> for TraitPredicate<'tcx> {
ecx: &mut EvalCtxt<'_, 'tcx>,
goal: Goal<'tcx, Self>,
) -> QueryResult<'tcx> {
if goal.predicate.polarity != ty::ImplPolarity::Positive {
if goal.predicate.polarity != ty::PredicatePolarity::Positive {
return Err(NoSolution);
}
@ -251,7 +257,7 @@ impl<'tcx> assembly::GoalKind<'tcx> for TraitPredicate<'tcx> {
let self_ty = goal.predicate.self_ty();
match goal.predicate.polarity {
// impl FnPtr for FnPtr {}
ty::ImplPolarity::Positive => {
ty::PredicatePolarity::Positive => {
if self_ty.is_fn_ptr() {
ecx.evaluate_added_goals_and_make_canonical_response(Certainty::Yes)
} else {
@ -259,7 +265,7 @@ impl<'tcx> assembly::GoalKind<'tcx> for TraitPredicate<'tcx> {
}
}
// impl !FnPtr for T where T != FnPtr && T is rigid {}
ty::ImplPolarity::Negative => {
ty::PredicatePolarity::Negative => {
// If a type is rigid and not a fn ptr, then we know for certain
// that it does *not* implement `FnPtr`.
if !self_ty.is_fn_ptr() && self_ty.is_known_rigid() {
@ -268,10 +274,6 @@ impl<'tcx> assembly::GoalKind<'tcx> for TraitPredicate<'tcx> {
Err(NoSolution)
}
}
// FIXME: Goal polarity should be split from impl polarity
ty::ImplPolarity::Reservation => {
bug!("we never expect a `Reservation` polarity in a trait goal")
}
}
}
@ -280,7 +282,7 @@ impl<'tcx> assembly::GoalKind<'tcx> for TraitPredicate<'tcx> {
goal: Goal<'tcx, Self>,
goal_kind: ty::ClosureKind,
) -> QueryResult<'tcx> {
if goal.predicate.polarity != ty::ImplPolarity::Positive {
if goal.predicate.polarity != ty::PredicatePolarity::Positive {
return Err(NoSolution);
}
@ -316,7 +318,7 @@ impl<'tcx> assembly::GoalKind<'tcx> for TraitPredicate<'tcx> {
goal: Goal<'tcx, Self>,
goal_kind: ty::ClosureKind,
) -> QueryResult<'tcx> {
if goal.predicate.polarity != ty::ImplPolarity::Positive {
if goal.predicate.polarity != ty::PredicatePolarity::Positive {
return Err(NoSolution);
}
@ -386,7 +388,7 @@ impl<'tcx> assembly::GoalKind<'tcx> for TraitPredicate<'tcx> {
ecx: &mut EvalCtxt<'_, 'tcx>,
goal: Goal<'tcx, Self>,
) -> QueryResult<'tcx> {
if goal.predicate.polarity != ty::ImplPolarity::Positive {
if goal.predicate.polarity != ty::PredicatePolarity::Positive {
return Err(NoSolution);
}
@ -401,7 +403,7 @@ impl<'tcx> assembly::GoalKind<'tcx> for TraitPredicate<'tcx> {
ecx: &mut EvalCtxt<'_, 'tcx>,
goal: Goal<'tcx, Self>,
) -> QueryResult<'tcx> {
if goal.predicate.polarity != ty::ImplPolarity::Positive {
if goal.predicate.polarity != ty::PredicatePolarity::Positive {
return Err(NoSolution);
}
@ -412,7 +414,7 @@ impl<'tcx> assembly::GoalKind<'tcx> for TraitPredicate<'tcx> {
ecx: &mut EvalCtxt<'_, 'tcx>,
goal: Goal<'tcx, Self>,
) -> QueryResult<'tcx> {
if goal.predicate.polarity != ty::ImplPolarity::Positive {
if goal.predicate.polarity != ty::PredicatePolarity::Positive {
return Err(NoSolution);
}
@ -436,7 +438,7 @@ impl<'tcx> assembly::GoalKind<'tcx> for TraitPredicate<'tcx> {
ecx: &mut EvalCtxt<'_, 'tcx>,
goal: Goal<'tcx, Self>,
) -> QueryResult<'tcx> {
if goal.predicate.polarity != ty::ImplPolarity::Positive {
if goal.predicate.polarity != ty::PredicatePolarity::Positive {
return Err(NoSolution);
}
@ -460,7 +462,7 @@ impl<'tcx> assembly::GoalKind<'tcx> for TraitPredicate<'tcx> {
ecx: &mut EvalCtxt<'_, 'tcx>,
goal: Goal<'tcx, Self>,
) -> QueryResult<'tcx> {
if goal.predicate.polarity != ty::ImplPolarity::Positive {
if goal.predicate.polarity != ty::PredicatePolarity::Positive {
return Err(NoSolution);
}
@ -482,7 +484,7 @@ impl<'tcx> assembly::GoalKind<'tcx> for TraitPredicate<'tcx> {
ecx: &mut EvalCtxt<'_, 'tcx>,
goal: Goal<'tcx, Self>,
) -> QueryResult<'tcx> {
if goal.predicate.polarity != ty::ImplPolarity::Positive {
if goal.predicate.polarity != ty::PredicatePolarity::Positive {
return Err(NoSolution);
}
@ -506,7 +508,7 @@ impl<'tcx> assembly::GoalKind<'tcx> for TraitPredicate<'tcx> {
ecx: &mut EvalCtxt<'_, 'tcx>,
goal: Goal<'tcx, Self>,
) -> QueryResult<'tcx> {
if goal.predicate.polarity != ty::ImplPolarity::Positive {
if goal.predicate.polarity != ty::PredicatePolarity::Positive {
return Err(NoSolution);
}
@ -537,7 +539,7 @@ impl<'tcx> assembly::GoalKind<'tcx> for TraitPredicate<'tcx> {
ecx: &mut EvalCtxt<'_, 'tcx>,
goal: Goal<'tcx, Self>,
) -> QueryResult<'tcx> {
if goal.predicate.polarity != ty::ImplPolarity::Positive {
if goal.predicate.polarity != ty::PredicatePolarity::Positive {
return Err(NoSolution);
}
@ -549,7 +551,7 @@ impl<'tcx> assembly::GoalKind<'tcx> for TraitPredicate<'tcx> {
ecx: &mut EvalCtxt<'_, 'tcx>,
goal: Goal<'tcx, Self>,
) -> QueryResult<'tcx> {
if goal.predicate.polarity != ty::ImplPolarity::Positive {
if goal.predicate.polarity != ty::PredicatePolarity::Positive {
return Err(NoSolution);
}
@ -564,7 +566,7 @@ impl<'tcx> assembly::GoalKind<'tcx> for TraitPredicate<'tcx> {
ecx: &mut EvalCtxt<'_, 'tcx>,
goal: Goal<'tcx, Self>,
) -> QueryResult<'tcx> {
if goal.predicate.polarity != ty::ImplPolarity::Positive {
if goal.predicate.polarity != ty::PredicatePolarity::Positive {
return Err(NoSolution);
}
@ -601,7 +603,7 @@ impl<'tcx> assembly::GoalKind<'tcx> for TraitPredicate<'tcx> {
ecx: &mut EvalCtxt<'_, 'tcx>,
goal: Goal<'tcx, Self>,
) -> Vec<(CanonicalResponse<'tcx>, BuiltinImplSource)> {
if goal.predicate.polarity != ty::ImplPolarity::Positive {
if goal.predicate.polarity != ty::PredicatePolarity::Positive {
return vec![];
}

10
compiler/rustc_trait_selection/src/traits/auto_trait.rs
View file

@ -8,7 +8,7 @@ use crate::infer::region_constraints::{Constraint, RegionConstraintData};
use crate::traits::project::ProjectAndUnifyResult;
use rustc_infer::infer::DefineOpaqueTypes;
use rustc_middle::mir::interpret::ErrorHandled;
use rustc_middle::ty::{ImplPolarity, Region, RegionVid};
use rustc_middle::ty::{Region, RegionVid};
use rustc_data_structures::fx::{FxHashMap, FxHashSet, FxIndexSet};
@ -96,9 +96,9 @@ impl<'tcx> AutoTraitFinder<'tcx> {
ty::TraitPredicate {
trait_ref,
polarity: if polarity {
ImplPolarity::Positive
ty::PredicatePolarity::Positive
} else {
ImplPolarity::Negative
ty::PredicatePolarity::Negative
},
},
));
@ -258,7 +258,7 @@ impl<'tcx> AutoTraitFinder<'tcx> {
trait_ref: ty::TraitRef::new(infcx.tcx, trait_did, [ty]),
// Auto traits are positive
polarity: ty::ImplPolarity::Positive,
polarity: ty::PredicatePolarity::Positive,
}));
let computed_preds = param_env.caller_bounds().iter().map(|c| c.as_predicate());
@ -295,7 +295,7 @@ impl<'tcx> AutoTraitFinder<'tcx> {
}) = impl_source
{
// Blame 'tidy' for the weird bracket placement.
if infcx.tcx.impl_polarity(*impl_def_id) == ty::ImplPolarity::Negative {
if infcx.tcx.impl_polarity(*impl_def_id) != ty::ImplPolarity::Positive {
debug!(
"evaluate_nested_obligations: found explicit negative impl\
{:?}, bailing out",

2
compiler/rustc_trait_selection/src/traits/error_reporting/infer_ctxt_ext.rs
View file

@ -206,7 +206,7 @@ impl<'tcx> InferCtxt<'tcx> {
&self,
param_env: ty::ParamEnv<'tcx>,
ty: ty::Binder<'tcx, Ty<'tcx>>,
polarity: ty::ImplPolarity,
polarity: ty::PredicatePolarity,
) -> Result<(ty::ClosureKind, ty::Binder<'tcx, Ty<'tcx>>), ()> {
self.commit_if_ok(|_| {
for trait_def_id in [

6
compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs
View file

@ -245,7 +245,7 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
associated_ty: Option<(&'static str, Ty<'tcx>)>,
mut body_id: LocalDefId,
) {
if trait_pred.skip_binder().polarity == ty::ImplPolarity::Negative {
if trait_pred.skip_binder().polarity != ty::PredicatePolarity::Positive {
return;
}
@ -4057,7 +4057,7 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
span,
[*ty],
),
polarity: ty::ImplPolarity::Positive,
polarity: ty::PredicatePolarity::Positive,
});
let Some(generics) = node.generics() else {
continue;
@ -4802,7 +4802,7 @@ pub(super) fn get_explanation_based_on_obligation<'tcx>(
Some(desc) => format!(" {desc}"),
None => String::new(),
};
if let ty::ImplPolarity::Positive = trait_predicate.polarity() {
if let ty::PredicatePolarity::Positive = trait_predicate.polarity() {
format!(
"{pre_message}the trait `{}` is not implemented for{desc} `{}`{post}",
trait_predicate.print_modifiers_and_trait_path(),

2
compiler/rustc_trait_selection/src/traits/error_reporting/type_err_ctxt_ext.rs
View file

@ -1905,7 +1905,7 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
.all_impls(trait_pred.def_id())
.filter_map(|def_id| {
let imp = self.tcx.impl_trait_header(def_id).unwrap();
if imp.polarity == ty::ImplPolarity::Negative
if imp.polarity != ty::ImplPolarity::Positive
|| !self.tcx.is_user_visible_dep(def_id.krate)
{
return None;

2
compiler/rustc_trait_selection/src/traits/object_safety.rs
View file

@ -584,7 +584,7 @@ fn virtual_call_violations_for_method<'tcx>(
// implement auto traits if the underlying type does as well.
if let ty::ClauseKind::Trait(ty::TraitPredicate {
trait_ref: pred_trait_ref,
polarity: ty::ImplPolarity::Positive,
polarity: ty::PredicatePolarity::Positive,
}) = pred.kind().skip_binder()
&& pred_trait_ref.self_ty() == tcx.types.self_param
&& tcx.trait_is_auto(pred_trait_ref.def_id)

2
compiler/rustc_trait_selection/src/traits/select/candidate_assembly.rs
View file

@ -56,7 +56,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
let mut candidates = SelectionCandidateSet { vec: Vec::new(), ambiguous: false };
// Negative trait predicates have different rules than positive trait predicates.
if obligation.polarity() == ty::ImplPolarity::Negative {
if obligation.polarity() == ty::PredicatePolarity::Negative {
self.assemble_candidates_for_trait_alias(obligation, &mut candidates);
self.assemble_candidates_from_impls(obligation, &mut candidates);
self.assemble_candidates_from_caller_bounds(stack, &mut candidates)?;

4
compiler/rustc_trait_selection/src/traits/select/confirmation.rs
View file

@ -1460,7 +1460,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
cause.span,
[nested_ty.into(), host_effect_param],
),
polarity: ty::ImplPolarity::Positive,
polarity: ty::PredicatePolarity::Positive,
}),
&mut nested,
);
@ -1485,7 +1485,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
cause.span,
[nested_ty.into(), host_effect_param],
),
polarity: ty::ImplPolarity::Positive,
polarity: ty::PredicatePolarity::Positive,
});
nested.push(Obligation::with_depth(

11
compiler/rustc_trait_selection/src/traits/select/mod.rs
View file

@ -1418,10 +1418,13 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
for candidate in candidates {
if let ImplCandidate(def_id) = candidate {
if ty::ImplPolarity::Reservation == tcx.impl_polarity(def_id)
|| obligation.polarity() == tcx.impl_polarity(def_id)
{
result.push(candidate);
match (tcx.impl_polarity(def_id), obligation.polarity()) {
(ty::ImplPolarity::Reservation, _)
| (ty::ImplPolarity::Positive, ty::PredicatePolarity::Positive)
| (ty::ImplPolarity::Negative, ty::PredicatePolarity::Negative) => {
result.push(candidate);
}
_ => {}
}
} else {
result.push(candidate);

2
compiler/rustc_trait_selection/src/traits/wf.rs
View file

@ -363,7 +363,7 @@ impl<'a, 'tcx> WfPredicates<'a, 'tcx> {
// Negative trait predicates don't require supertraits to hold, just
// that their args are WF.
if trait_pred.polarity == ty::ImplPolarity::Negative {
if trait_pred.polarity == ty::PredicatePolarity::Negative {
self.compute_negative_trait_pred(trait_ref);
return;
}