Make ConstKind and TyKind Copy

compiler/rustc_middle/src/arena.rs

@@ -92,10 +92,6 @@ macro_rules! arena_types {
             [] name_set: rustc_data_structures::unord::UnordSet<rustc_span::symbol::Symbol>,
             [] ordered_name_set: rustc_data_structures::fx::FxIndexSet<rustc_span::symbol::Symbol>,
 
-            // Interned types
-            [] tys: rustc_type_ir::WithCachedTypeInfo<rustc_middle::ty::TyKind<'tcx>>,
-            [] consts: rustc_type_ir::WithCachedTypeInfo<rustc_middle::ty::ConstData<'tcx>>,
-
             // Note that this deliberately duplicates items in the `rustc_hir::arena`,
             // since we need to allocate this type on both the `rustc_hir` arena
             // (during lowering) and the `librustc_middle` arena (for decoding MIR)

compiler/rustc_middle/src/ty/consts.rs

@@ -41,7 +41,8 @@ fn ty(self) -> Ty<'tcx> {
 }
 
 /// Typed constant value.
-#[derive(PartialEq, Eq, PartialOrd, Ord, Hash, HashStable, TyEncodable, TyDecodable)]
+#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+#[derive(HashStable, TyEncodable, TyDecodable)]
 pub struct ConstData<'tcx> {
     pub ty: Ty<'tcx>,
     pub kind: ConstKind<'tcx>,

compiler/rustc_type_ir/src/const_kind.rs

@@ -10,6 +10,7 @@
 #[derive(derivative::Derivative)]
 #[derivative(
     Clone(bound = ""),
+    Copy(bound = ""),
     PartialOrd(bound = ""),
     PartialOrd = "feature_allow_slow_enum",
     Ord(bound = ""),

compiler/rustc_type_ir/src/ty_kind.rs

@@ -111,6 +111,7 @@ pub enum AliasKind {
 #[derive(derivative::Derivative)]
 #[derivative(
     Clone(bound = ""),
+    Copy(bound = ""),
     PartialOrd(bound = ""),
     PartialOrd = "feature_allow_slow_enum",
     Ord(bound = ""),