Merge SimplifiedTypeGen<D> into SimplifiedType.

`SimplifiedTypeGen<DefId>` is the only instantiation used, so we don't
need the generic parameter.

compiler/rustc_middle/src/ty/fast_reject.rs

@@ -6,28 +6,18 @@ use std::fmt::Debug;
 use std::hash::Hash;
 use std::iter;
 
-use self::SimplifiedTypeGen::*;
+use self::SimplifiedType::*;
 
-pub type SimplifiedType = SimplifiedTypeGen<DefId>;
-
-/// See `simplify_type`
-///
-/// Note that we keep this type generic over the type of identifier it uses
-/// because we sometimes need to use SimplifiedTypeGen values as stable sorting
-/// keys (in which case we use a DefPathHash as id-type) but in the general case
-/// the non-stable but fast to construct DefId-version is the better choice.
+/// See `simplify_type`.
 #[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, TyEncodable, TyDecodable, HashStable)]
-pub enum SimplifiedTypeGen<D>
-where
-    D: Copy + Debug + Eq,
-{
+pub enum SimplifiedType {
     BoolSimplifiedType,
     CharSimplifiedType,
     IntSimplifiedType(ty::IntTy),
     UintSimplifiedType(ty::UintTy),
     FloatSimplifiedType(ty::FloatTy),
-    AdtSimplifiedType(D),
-    ForeignSimplifiedType(D),
+    AdtSimplifiedType(DefId),
+    ForeignSimplifiedType(DefId),
     StrSimplifiedType,
     ArraySimplifiedType,
     SliceSimplifiedType,
@@ -38,9 +28,9 @@ where
     /// A trait object, all of whose components are markers
     /// (e.g., `dyn Send + Sync`).
     MarkerTraitObjectSimplifiedType,
-    TraitSimplifiedType(D),
-    ClosureSimplifiedType(D),
-    GeneratorSimplifiedType(D),
+    TraitSimplifiedType(DefId),
+    ClosureSimplifiedType(DefId),
+    GeneratorSimplifiedType(DefId),
     GeneratorWitnessSimplifiedType(usize),
     FunctionSimplifiedType(usize),
     PlaceholderSimplifiedType,
@@ -142,8 +132,8 @@ pub fn simplify_type<'tcx>(
     }
 }
 
-impl<D: Copy + Debug + Eq> SimplifiedTypeGen<D> {
-    pub fn def(self) -> Option<D> {
+impl SimplifiedType {
+    pub fn def(self) -> Option<DefId> {
         match self {
             AdtSimplifiedType(d)
             | ForeignSimplifiedType(d)

compiler/rustc_middle/src/ty/parameterized.rs

@@ -1,5 +1,5 @@
 use rustc_data_structures::fx::FxHashMap;
-use rustc_hir::def_id::{DefId, DefIndex};
+use rustc_hir::def_id::DefIndex;
 use rustc_index::vec::{Idx, IndexVec};
 
 use crate::middle::exported_symbols::ExportedSymbol;
@@ -67,7 +67,7 @@ trivially_parameterized_over_tcx! {
     ty::TraitDef,
     ty::Visibility<DefIndex>,
     ty::adjustment::CoerceUnsizedInfo,
-    ty::fast_reject::SimplifiedTypeGen<DefId>,
+    ty::fast_reject::SimplifiedType,
     rustc_ast::Attribute,
     rustc_ast::DelimArgs,
     rustc_attr::ConstStability,

src/librustdoc/clean/inline.rs

@@ -325,7 +325,7 @@ pub(crate) fn build_impls(
     // * https://github.com/rust-lang/rust/pull/99917 — where the feature got used
     // * https://github.com/rust-lang/rust/issues/53487 — overall tracking issue for Error
     if tcx.has_attr(did, sym::rustc_has_incoherent_inherent_impls) {
-        use rustc_middle::ty::fast_reject::SimplifiedTypeGen::*;
+        use rustc_middle::ty::fast_reject::SimplifiedType::*;
         let type_ =
             if tcx.is_trait(did) { TraitSimplifiedType(did) } else { AdtSimplifiedType(did) };
         for &did in tcx.incoherent_impls(type_) {

src/librustdoc/clean/types.rs

@@ -1870,7 +1870,7 @@ impl PrimitiveType {
     }
 
     pub(crate) fn simplified_types() -> &'static SimplifiedTypes {
-        use ty::fast_reject::SimplifiedTypeGen::*;
+        use ty::fast_reject::SimplifiedType::*;
         use ty::{FloatTy, IntTy, UintTy};
         use PrimitiveType::*;
         static CELL: OnceCell<SimplifiedTypes> = OnceCell::new();

src/tools/clippy/clippy_utils/src/lib.rs

@@ -97,7 +97,7 @@ use rustc_middle::hir::place::PlaceBase;
 use rustc_middle::ty as rustc_ty;
 use rustc_middle::ty::adjustment::{Adjust, Adjustment, AutoBorrow};
 use rustc_middle::ty::binding::BindingMode;
-use rustc_middle::ty::fast_reject::SimplifiedTypeGen::{
+use rustc_middle::ty::fast_reject::SimplifiedType::{
     ArraySimplifiedType, BoolSimplifiedType, CharSimplifiedType, FloatSimplifiedType, IntSimplifiedType,
     PtrSimplifiedType, SliceSimplifiedType, StrSimplifiedType, UintSimplifiedType,
 };