bjoernager/rust
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Remove some unused type folders.

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I'm surprised the compiler doesn't warn about these. It appears having
an `impl` on a struct is enough to avoid a warning about it never being
constructed.
This commit is contained in:
Nicholas Nethercote 2023-04-12 16:49:13 +10:00
parent bbc400993e
commit 72605cd267
4 changed files with 4 additions and 145 deletions
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21
compiler/rustc_trait_selection/src/traits/auto_trait.rs
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@ -9,7 +9,6 @@ use crate::infer::InferCtxt;
use crate::traits::project::ProjectAndUnifyResult;
use rustc_infer::infer::DefineOpaqueTypes;
use rustc_middle::mir::interpret::ErrorHandled;
use rustc_middle::ty::fold::{TypeFolder, TypeSuperFoldable};
use rustc_middle::ty::visit::TypeVisitableExt;
use rustc_middle::ty::{ImplPolarity, Region, RegionVid};
@ -851,23 +850,3 @@ impl<'tcx> AutoTraitFinder<'tcx> {
infcx.freshen(p)
}
}
/// Replaces all ReVars in a type with ty::Region's, using the provided map
pub struct RegionReplacer<'a, 'tcx> {
vid_to_region: &'a FxHashMap<ty::RegionVid, ty::Region<'tcx>>,
tcx: TyCtxt<'tcx>,
}
impl<'a, 'tcx> TypeFolder<TyCtxt<'tcx>> for RegionReplacer<'a, 'tcx> {
fn interner(&self) -> TyCtxt<'tcx> {
self.tcx
}
fn fold_region(&mut self, r: ty::Region<'tcx>) -> ty::Region<'tcx> {
(match *r {
ty::ReVar(vid) => self.vid_to_region.get(&vid).cloned(),
_ => None,
})
.unwrap_or_else(|| r.super_fold_with(self))
}
}