Use derivative for clone

Cargo.lock

@@ -1011,6 +1011,17 @@ dependencies = [
  "syn 2.0.29",
 ]
 
+[[package]]
+name = "derivative"
+version = "2.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fcc3dd5e9e9c0b295d6e1e4d811fb6f157d5ffd784b8d202fc62eac8035a770b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+]
+
 [[package]]
 name = "derive_builder"
 version = "0.12.0"
@@ -4671,6 +4682,7 @@ name = "rustc_type_ir"
 version = "0.0.0"
 dependencies = [
  "bitflags 1.3.2",
+ "derivative",
  "rustc_data_structures",
  "rustc_index",
  "rustc_macros",

compiler/rustc_type_ir/Cargo.toml

@@ -12,3 +12,4 @@ rustc_serialize = { path = "../rustc_serialize" }
 rustc_data_structures = { path = "../rustc_data_structures" }
 rustc_macros = { path = "../rustc_macros" }
 smallvec = { version = "1.8.1", features = ["union", "may_dangle"] }
+derivative = "2.2.0"

compiler/rustc_type_ir/src/canonical.rs

@@ -13,6 +13,8 @@ use crate::{HashStableContext, Interner, TyEncoder, UniverseIndex};
 /// A "canonicalized" type `V` is one where all free inference
 /// variables have been rewritten to "canonical vars". These are
 /// numbered starting from 0 in order of first appearance.
+#[derive(derivative::Derivative)]
+#[derivative(Clone(bound = "V: Clone"))]
 pub struct Canonical<I: Interner, V> {
     pub value: V,
     pub max_universe: UniverseIndex,
@@ -108,16 +110,6 @@ impl<I: Interner, V: fmt::Debug> fmt::Debug for Canonical<I, V> {
     }
 }
 
-impl<I: Interner, V: Clone> Clone for Canonical<I, V> {
-    fn clone(&self) -> Self {
-        Canonical {
-            value: self.value.clone(),
-            max_universe: self.max_universe.clone(),
-            variables: self.variables.clone(),
-        }
-    }
-}
-
 impl<I: Interner, V: Copy> Copy for Canonical<I, V> where I::CanonicalVars: Copy {}
 
 impl<I: Interner, V: TypeFoldable<I>> TypeFoldable<I> for Canonical<I, V>

compiler/rustc_type_ir/src/const_kind.rs

@@ -13,7 +13,8 @@ use crate::{
 use self::ConstKind::*;
 
 /// Represents a constant in Rust.
-// #[derive(derive_more::From)]
+#[derive(derivative::Derivative)]
+#[derivative(Clone(bound = ""))]
 pub enum ConstKind<I: Interner> {
     /// A const generic parameter.
     Param(I::ParamConst),
@@ -211,21 +212,6 @@ impl<I: Interner> PartialEq for ConstKind<I> {
 
 impl<I: Interner> Eq for ConstKind<I> {}
 
-impl<I: Interner> Clone for ConstKind<I> {
-    fn clone(&self) -> Self {
-        match self {
-            Param(arg0) => Param(arg0.clone()),
-            Infer(arg0) => Infer(arg0.clone()),
-            Bound(arg0, arg1) => Bound(arg0.clone(), arg1.clone()),
-            Placeholder(arg0) => Placeholder(arg0.clone()),
-            Unevaluated(arg0) => Unevaluated(arg0.clone()),
-            Value(arg0) => Value(arg0.clone()),
-            Error(arg0) => Error(arg0.clone()),
-            Expr(arg0) => Expr(arg0.clone()),
-        }
-    }
-}
-
 impl<I: Interner> fmt::Debug for ConstKind<I> {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         WithInfcx::with_no_infcx(self).fmt(f)

compiler/rustc_type_ir/src/predicate_kind.rs

@@ -12,6 +12,8 @@ use crate::{TyDecoder, TyEncoder};
 
 /// A clause is something that can appear in where bounds or be inferred
 /// by implied bounds.
+#[derive(derivative::Derivative)]
+#[derivative(Clone(bound = ""))]
 pub enum ClauseKind<I: Interner> {
     /// Corresponds to `where Foo: Bar<A, B, C>`. `Foo` here would be
     /// the `Self` type of the trait reference and `A`, `B`, and `C`
@@ -39,20 +41,6 @@ pub enum ClauseKind<I: Interner> {
     ConstEvaluatable(I::Const),
 }
 
-impl<I: Interner> Clone for ClauseKind<I> {
-    fn clone(&self) -> Self {
-        match self {
-            Self::Trait(arg0) => Self::Trait(arg0.clone()),
-            Self::RegionOutlives(arg0) => Self::RegionOutlives(arg0.clone()),
-            Self::TypeOutlives(arg0) => Self::TypeOutlives(arg0.clone()),
-            Self::Projection(arg0) => Self::Projection(arg0.clone()),
-            Self::ConstArgHasType(arg0, arg1) => Self::ConstArgHasType(arg0.clone(), arg1.clone()),
-            Self::WellFormed(arg0) => Self::WellFormed(arg0.clone()),
-            Self::ConstEvaluatable(arg0) => Self::ConstEvaluatable(arg0.clone()),
-        }
-    }
-}
-
 impl<I: Interner> Copy for ClauseKind<I>
 where
     I::Ty: Copy,
@@ -249,6 +237,8 @@ where
     }
 }
 
+#[derive(derivative::Derivative)]
+#[derivative(Clone(bound = ""))]
 pub enum PredicateKind<I: Interner> {
     /// Prove a clause
     Clause(ClauseKind<I>),
@@ -305,25 +295,6 @@ where
 {
 }
 
-impl<I: Interner> Clone for PredicateKind<I> {
-    fn clone(&self) -> Self {
-        match self {
-            Self::Clause(arg0) => Self::Clause(arg0.clone()),
-            Self::ObjectSafe(arg0) => Self::ObjectSafe(arg0.clone()),
-            Self::ClosureKind(arg0, arg1, arg2) => {
-                Self::ClosureKind(arg0.clone(), arg1.clone(), arg2.clone())
-            }
-            Self::Subtype(arg0) => Self::Subtype(arg0.clone()),
-            Self::Coerce(arg0) => Self::Coerce(arg0.clone()),
-            Self::ConstEquate(arg0, arg1) => Self::ConstEquate(arg0.clone(), arg1.clone()),
-            Self::Ambiguous => Self::Ambiguous,
-            Self::AliasRelate(arg0, arg1, arg2) => {
-                Self::AliasRelate(arg0.clone(), arg1.clone(), arg2.clone())
-            }
-        }
-    }
-}
-
 impl<I: Interner> PartialEq for PredicateKind<I> {
     fn eq(&self, other: &Self) -> bool {
         match (self, other) {

compiler/rustc_type_ir/src/region_kind.rs

@@ -118,6 +118,8 @@ use self::RegionKind::*;
 /// [1]: https://smallcultfollowing.com/babysteps/blog/2013/10/29/intermingled-parameter-lists/
 /// [2]: https://smallcultfollowing.com/babysteps/blog/2013/11/04/intermingled-parameter-lists/
 /// [rustc dev guide]: https://rustc-dev-guide.rust-lang.org/traits/hrtb.html
+#[derive(derivative::Derivative)]
+#[derivative(Clone(bound = ""))]
 pub enum RegionKind<I: Interner> {
     /// Region bound in a type or fn declaration which will be
     /// substituted 'early' -- that is, at the same time when type
@@ -178,22 +180,6 @@ where
 {
 }
 
-// This is manually implemented because a derive would require `I: Clone`
-impl<I: Interner> Clone for RegionKind<I> {
-    fn clone(&self) -> Self {
-        match self {
-            ReEarlyBound(r) => ReEarlyBound(r.clone()),
-            ReLateBound(d, r) => ReLateBound(*d, r.clone()),
-            ReFree(r) => ReFree(r.clone()),
-            ReStatic => ReStatic,
-            ReVar(r) => ReVar(r.clone()),
-            RePlaceholder(r) => RePlaceholder(r.clone()),
-            ReErased => ReErased,
-            ReError(r) => ReError(r.clone()),
-        }
-    }
-}
-
 // This is manually implemented because a derive would require `I: PartialEq`
 impl<I: Interner> PartialEq for RegionKind<I> {
     #[inline]

compiler/rustc_type_ir/src/ty_kind.rs

@@ -114,6 +114,8 @@ pub enum AliasKind {
 /// Types written by the user start out as `hir::TyKind` and get
 /// converted to this representation using `AstConv::ast_ty_to_ty`.
 #[rustc_diagnostic_item = "IrTyKind"]
+#[derive(derivative::Derivative)]
+#[derivative(Clone(bound = ""))]
 pub enum TyKind<I: Interner> {
     /// The primitive boolean type. Written as `bool`.
     Bool,
@@ -324,40 +326,6 @@ const fn tykind_discriminant<I: Interner>(value: &TyKind<I>) -> usize {
     }
 }
 
-// This is manually implemented because a derive would require `I: Clone`
-impl<I: Interner> Clone for TyKind<I> {
-    fn clone(&self) -> Self {
-        match self {
-            Bool => Bool,
-            Char => Char,
-            Int(i) => Int(*i),
-            Uint(u) => Uint(*u),
-            Float(f) => Float(*f),
-            Adt(d, s) => Adt(d.clone(), s.clone()),
-            Foreign(d) => Foreign(d.clone()),
-            Str => Str,
-            Array(t, c) => Array(t.clone(), c.clone()),
-            Slice(t) => Slice(t.clone()),
-            RawPtr(p) => RawPtr(p.clone()),
-            Ref(r, t, m) => Ref(r.clone(), t.clone(), m.clone()),
-            FnDef(d, s) => FnDef(d.clone(), s.clone()),
-            FnPtr(s) => FnPtr(s.clone()),
-            Dynamic(p, r, repr) => Dynamic(p.clone(), r.clone(), *repr),
-            Closure(d, s) => Closure(d.clone(), s.clone()),
-            Coroutine(d, s, m) => Coroutine(d.clone(), s.clone(), m.clone()),
-            CoroutineWitness(d, s) => CoroutineWitness(d.clone(), s.clone()),
-            Never => Never,
-            Tuple(t) => Tuple(t.clone()),
-            Alias(k, p) => Alias(*k, p.clone()),
-            Param(p) => Param(p.clone()),
-            Bound(d, b) => Bound(*d, b.clone()),
-            Placeholder(p) => Placeholder(p.clone()),
-            Infer(t) => Infer(t.clone()),
-            Error(e) => Error(e.clone()),
-        }
-    }
-}
-
 // This is manually implemented because a derive would require `I: PartialEq`
 impl<I: Interner> PartialEq for TyKind<I> {
     #[inline]
@@ -614,6 +582,7 @@ impl<I: Interner> DebugWithInfcx<I> for TyKind<I> {
         }
     }
 }
+
 // This is manually implemented because a derive would require `I: Debug`
 impl<I: Interner> fmt::Debug for TyKind<I> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {

src/tools/tidy/src/deps.rs

@@ -142,6 +142,7 @@ const PERMITTED_RUSTC_DEPENDENCIES: &[&str] = &[
     "darling_core",
     "darling_macro",
     "datafrog",
+    "derivative",
     "derive_more",
     "derive_setters",
     "digest",