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Rollup merge of #94057 - lcnr:simplify_type-uwu, r=nikomatsakis

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improve comments for `simplify_type`

Should now correctly describe what's going on. Experimented with checking the invariant for projections
but that ended up requiring fairly involved changes. I assume that it is not possible to get unsoundness here,
at least for now and I can pretty much guarantee that it's impossible to trigger it by accident.

r? `````@nikomatsakis````` cc #92721
This commit is contained in:
Matthias Krüger 2022-03-03 20:01:44 +01:00 • committed by GitHub
commit fec7a79088
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7 changed files with 66 additions and 60 deletions
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4
compiler/rustc_metadata/src/rmeta/encoder.rs
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@ -26,7 +26,7 @@ use rustc_middle::mir::interpret;
use rustc_middle::thir;
use rustc_middle::traits::specialization_graph;
use rustc_middle::ty::codec::TyEncoder;
use rustc_middle::ty::fast_reject::{self, SimplifiedType, SimplifyParams};
use rustc_middle::ty::fast_reject::{self, SimplifiedType, TreatParams};
use rustc_middle::ty::query::Providers;
use rustc_middle::ty::{self, SymbolName, Ty, TyCtxt};
use rustc_serialize::{opaque, Encodable, Encoder};
@ -2043,7 +2043,7 @@ impl<'tcx, 'v> ItemLikeVisitor<'v> for ImplsVisitor<'tcx> {
let simplified_self_ty = fast_reject::simplify_type(
self.tcx,
trait_ref.self_ty(),
SimplifyParams::No,
TreatParams::AsPlaceholders,
);
self.impls