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Auto merge of #118267 - compiler-errors:ambiguity-causes, r=spastorino

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`AmbiguityCause` should not eagerly format strings

Minor tweak found when working on some coherence diagnostics stuff (towards `-Ztrait-solver=next-coherence` stabilization)
This commit is contained in:
bors
2023-11-26 12:44:38 +00:00
parent 3acb261e21 0750a5df4d
commit 0b8a61b235
3 changed files with 56 additions and 69 deletions
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39
compiler/rustc_trait_selection/src/traits/coherence.rs
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@@ -29,7 +29,6 @@ use rustc_middle::traits::solve::{CandidateSource, Certainty, Goal};
use rustc_middle::traits::specialization_graph::OverlapMode;
use rustc_middle::traits::DefiningAnchor;
use rustc_middle::ty::fast_reject::{DeepRejectCtxt, TreatParams};
use rustc_middle::ty::print::with_no_trimmed_paths;
use rustc_middle::ty::visit::{TypeVisitable, TypeVisitableExt};
use rustc_middle::ty::{self, Ty, TyCtxt, TypeSuperVisitable, TypeVisitor};
use rustc_session::lint::builtin::COINDUCTIVE_OVERLAP_IN_COHERENCE;
@@ -54,7 +53,7 @@ pub enum Conflict {
pub struct OverlapResult<'tcx> {
pub impl_header: ty::ImplHeader<'tcx>,
pub intercrate_ambiguity_causes: FxIndexSet<IntercrateAmbiguityCause>,
pub intercrate_ambiguity_causes: FxIndexSet<IntercrateAmbiguityCause<'tcx>>,
/// `true` if the overlap might've been permitted before the shift
/// to universes.
@@ -987,8 +986,8 @@ where
fn compute_intercrate_ambiguity_causes<'tcx>(
infcx: &InferCtxt<'tcx>,
obligations: &[PredicateObligation<'tcx>],
) -> FxIndexSet<IntercrateAmbiguityCause> {
let mut causes: FxIndexSet<IntercrateAmbiguityCause> = Default::default();
) -> FxIndexSet<IntercrateAmbiguityCause<'tcx>> {
let mut causes: FxIndexSet<IntercrateAmbiguityCause<'tcx>> = Default::default();
for obligation in obligations {
search_ambiguity_causes(infcx, obligation.clone().into(), &mut causes);
@@ -997,11 +996,11 @@ fn compute_intercrate_ambiguity_causes<'tcx>(
causes
}
struct AmbiguityCausesVisitor<'a> {
causes: &'a mut FxIndexSet<IntercrateAmbiguityCause>,
struct AmbiguityCausesVisitor<'a, 'tcx> {
causes: &'a mut FxIndexSet<IntercrateAmbiguityCause<'tcx>>,
}
impl<'a, 'tcx> ProofTreeVisitor<'tcx> for AmbiguityCausesVisitor<'a> {
impl<'a, 'tcx> ProofTreeVisitor<'tcx> for AmbiguityCausesVisitor<'a, 'tcx> {
type BreakTy = !;
fn visit_goal(&mut self, goal: &InspectGoal<'_, 'tcx>) -> ControlFlow<Self::BreakTy> {
let infcx = goal.infcx();
@@ -1041,14 +1040,12 @@ impl<'a, 'tcx> ProofTreeVisitor<'tcx> for AmbiguityCausesVisitor<'a> {
} = cand.kind()
{
if let ty::ImplPolarity::Reservation = infcx.tcx.impl_polarity(def_id) {
let value = infcx
let message = infcx
.tcx
.get_attr(def_id, sym::rustc_reservation_impl)
.and_then(|a| a.value_str());
if let Some(value) = value {
self.causes.insert(IntercrateAmbiguityCause::ReservationImpl {
message: value.to_string(),
});
if let Some(message) = message {
self.causes.insert(IntercrateAmbiguityCause::ReservationImpl { message });
}
}
}
@@ -1088,24 +1085,18 @@ impl<'a, 'tcx> ProofTreeVisitor<'tcx> for AmbiguityCausesVisitor<'a> {
Ok(Err(conflict)) => {
if !trait_ref.references_error() {
let self_ty = trait_ref.self_ty();
let (trait_desc, self_desc) = with_no_trimmed_paths!({
let trait_desc = trait_ref.print_only_trait_path().to_string();
let self_desc = self_ty
.has_concrete_skeleton()
.then(|| self_ty.to_string());
(trait_desc, self_desc)
});
let self_ty = self_ty.has_concrete_skeleton().then(|| self_ty);
ambiguity_cause = Some(match conflict {
Conflict::Upstream => {
IntercrateAmbiguityCause::UpstreamCrateUpdate {
trait_desc,
self_desc,
trait_ref,
self_ty,
}
}
Conflict::Downstream => {
IntercrateAmbiguityCause::DownstreamCrate {
trait_desc,
self_desc,
trait_ref,
self_ty,
}
}
});
@@ -1142,7 +1133,7 @@ impl<'a, 'tcx> ProofTreeVisitor<'tcx> for AmbiguityCausesVisitor<'a> {
fn search_ambiguity_causes<'tcx>(
infcx: &InferCtxt<'tcx>,
goal: Goal<'tcx, ty::Predicate<'tcx>>,
causes: &mut FxIndexSet<IntercrateAmbiguityCause>,
causes: &mut FxIndexSet<IntercrateAmbiguityCause<'tcx>>,
) {
infcx.visit_proof_tree(goal, &mut AmbiguityCausesVisitor { causes });
}