bjoernager/rust
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implement compute_alias_eq_goal

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This commit is contained in:
Boxy 2023-02-10 14:54:50 +00:00
parent 1f89e2aef2
commit fa83c10e96
3 changed files with 163 additions and 14 deletions
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27
compiler/rustc_middle/src/ty/mod.rs
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@ -970,6 +970,33 @@ impl<'tcx> Term<'tcx> {
TermKind::Const(c) => c.into(),
}
}
/// This function returns `None` for `AliasKind::Opaque`.
///
/// FIXME: rename `AliasTy` to `AliasTerm` and make sure we correctly
/// deal with constants.
pub fn to_alias_term_no_opaque(&self, tcx: TyCtxt<'tcx>) -> Option<AliasTy<'tcx>> {
match self.unpack() {
TermKind::Ty(ty) => match ty.kind() {
ty::Alias(kind, alias_ty) => match kind {
AliasKind::Projection => Some(*alias_ty),
AliasKind::Opaque => None,
},
_ => None,
},
TermKind::Const(ct) => match ct.kind() {
ConstKind::Unevaluated(uv) => Some(tcx.mk_alias_ty(uv.def.did, uv.substs)),
_ => None,
},
}
}
pub fn is_infer(&self) -> bool {
match self.unpack() {
TermKind::Ty(ty) => ty.is_ty_or_numeric_infer(),
TermKind::Const(ct) => ct.is_ct_infer(),
}
}
}
const TAG_MASK: usize = 0b11;