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Tweak consts_may_unify.

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`ConstKind::Value` is the only variant where control flow leaves the
first match on `impl_ct.kind()`, so there is no need for a second match
on the same expression later on.
This commit is contained in:
Nicholas Nethercote 2024-05-02 13:27:57 +10:00
parent 4f81879620
commit 3722eb0b8f
1 changed files with 4 additions and 8 deletions
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12
compiler/rustc_middle/src/ty/fast_reject.rs
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@ -330,20 +330,19 @@ pub fn types_may_unify<'tcx>(self, obligation_ty: Ty<'tcx>, impl_ty: Ty<'tcx>) -
}
pub fn consts_may_unify(self, obligation_ct: ty::Const<'_>, impl_ct: ty::Const<'_>) -> bool {
match impl_ct.kind() {
let impl_val = match impl_ct.kind() {
ty::ConstKind::Expr(_)
| ty::ConstKind::Param(_)
| ty::ConstKind::Unevaluated(_)
| ty::ConstKind::Error(_) => {
return true;
}
ty::ConstKind::Value(_) => {}
ty::ConstKind::Value(impl_val) => impl_val,
ty::ConstKind::Infer(_) | ty::ConstKind::Bound(..) | ty::ConstKind::Placeholder(_) => {
bug!("unexpected impl arg: {:?}", impl_ct)
}
}
};
let k = impl_ct.kind();
match obligation_ct.kind() {
ty::ConstKind::Param(_) => match self.treat_obligation_params {
TreatParams::ForLookup => false,
@ -358,10 +357,7 @@ pub fn consts_may_unify(self, obligation_ct: ty::Const<'_>, impl_ct: ty::Const<'
ty::ConstKind::Expr(_) | ty::ConstKind::Unevaluated(_) | ty::ConstKind::Error(_) => {
true
}
ty::ConstKind::Value(obl) => match k {
ty::ConstKind::Value(imp) => obl == imp,
_ => true,
},
ty::ConstKind::Value(obl_val) => obl_val == impl_val,
ty::ConstKind::Infer(_) => true,