bjoernager/rust
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Statically enforce revealing of opaques

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This commit is contained in:
Nadrieril 2023-12-26 13:21:35 +01:00
parent e51e98dde6
commit c35272058d
5 changed files with 132 additions and 94 deletions
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3
compiler/rustc_pattern_analysis/src/lib.rs
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@ -61,8 +61,6 @@ pub trait TypeCx: Sized + fmt::Debug {
/// Extra data to store in a pattern.
type PatData: Clone;
/// FIXME(Nadrieril): `Cx` should only give us revealed types.
fn reveal_opaque_ty(&self, ty: Self::Ty) -> Self::Ty;
fn is_exhaustive_patterns_feature_on(&self) -> bool;
/// The number of fields for this constructor.
@ -114,6 +112,7 @@ pub fn analyze_match<'p, 'tcx>(
) -> rustc::UsefulnessReport<'p, 'tcx> {
// Arena to store the extra wildcards we construct during analysis.
let wildcard_arena = tycx.pattern_arena;
let scrut_ty = tycx.reveal_opaque_ty(scrut_ty);
let scrut_validity = ValidityConstraint::from_bool(tycx.known_valid_scrutinee);
let cx = MatchCtxt { tycx, wildcard_arena };