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introduce helper function

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This commit is contained in:
Niko Matsakis 2021-07-03 22:15:32 -04:00
parent 1297cb7f37
commit 6f4b539a62
1 changed files with 13 additions and 4 deletions
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17
compiler/rustc_middle/src/ty/normalize_erasing_regions.rs
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@ -88,23 +88,32 @@ struct NormalizeAfterErasingRegionsFolder<'tcx> {
param_env: ty::ParamEnv<'tcx>,
}
impl<'tcx> NormalizeAfterErasingRegionsFolder<'tcx> {
fn normalize_generic_arg_after_erasing_regions(
&self,
arg: ty::GenericArg<'tcx>,
) -> ty::GenericArg<'tcx> {
let arg = self.param_env.and(arg);
self.tcx.normalize_generic_arg_after_erasing_regions(arg)
}
}
impl TypeFolder<'tcx> for NormalizeAfterErasingRegionsFolder<'tcx> {
fn tcx(&self) -> TyCtxt<'tcx> {
self.tcx
}
fn fold_ty(&mut self, ty: Ty<'tcx>) -> Ty<'tcx> {
let arg = self.param_env.and(ty.into());
self.tcx.normalize_generic_arg_after_erasing_regions(arg).expect_ty()
self.normalize_generic_arg_after_erasing_regions(ty.into()).expect_ty()
}
fn fold_const(&mut self, c: &'tcx ty::Const<'tcx>) -> &'tcx ty::Const<'tcx> {
let arg = self.param_env.and(c.into());
self.tcx.normalize_generic_arg_after_erasing_regions(arg).expect_const()
self.normalize_generic_arg_after_erasing_regions(c.into()).expect_const()
}
#[inline]
fn fold_mir_const(&mut self, c: mir::ConstantKind<'tcx>) -> mir::ConstantKind<'tcx> {
// FIXME: This *probalby* needs canonicalization too!
let arg = self.param_env.and(c);
self.tcx.normalize_mir_const_after_erasing_regions(arg)
}