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Rollup merge of #115519 - compiler-errors:next-solver-assoc-ice, r=lcnr

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Don't ICE on associated type projection without feature gate in new solver

Self-explanatory, we should avoid ICEs when the feature gate is not enabled. Continue to ICE when the feature gate *is* enabled, though.

Fixes #115500
This commit is contained in:
Matthias Krüger 2023-09-05 07:15:16 +02:00 • committed by GitHub
commit f5e6aa3c4a
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3 changed files with 55 additions and 1 deletions
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16
compiler/rustc_trait_selection/src/solve/project_goals.rs
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@ -244,7 +244,21 @@ impl<'tcx> assembly::GoalKind<'tcx> for ProjectionPredicate<'tcx> {
// Finally we construct the actual value of the associated type.
let term = match assoc_def.item.kind {
ty::AssocKind::Type => tcx.type_of(assoc_def.item.def_id).map_bound(|ty| ty.into()),
ty::AssocKind::Const => bug!("associated const projection is not supported yet"),
ty::AssocKind::Const => {
if tcx.features().associated_const_equality {
bug!("associated const projection is not supported yet")
} else {
ty::EarlyBinder::bind(
ty::Const::new_error_with_message(
tcx,
tcx.type_of(assoc_def.item.def_id).instantiate_identity(),
DUMMY_SP,
"associated const projection is not supported yet",
)
.into(),
)
}
}
ty::AssocKind::Fn => unreachable!("we should never project to a fn"),
};