Remove superfluous traversable impls

Author: eggyal

compiler/rustc_middle/src/hir/place.rs

@@ -5,7 +5,6 @@ use rustc_hir::HirId;
 use rustc_target::abi::{FieldIdx, VariantIdx};
 
 #[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, TyEncodable, TyDecodable, HashStable)]
-#[derive(TypeFoldable, TypeVisitable)]
 pub enum PlaceBase {
     /// A temporary variable.
     Rvalue,
@@ -18,7 +17,6 @@ pub enum PlaceBase {
 }
 
 #[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, TyEncodable, TyDecodable, HashStable)]
-#[derive(TypeFoldable, TypeVisitable)]
 pub enum ProjectionKind {
     /// A dereference of a pointer, reference or `Box<T>` of the given type.
     Deref,

compiler/rustc_middle/src/infer/canonical.rs

@@ -364,11 +364,6 @@ impl<'tcx, R> QueryResponse<'tcx, R> {
 pub type QueryOutlivesConstraint<'tcx> =
     (ty::OutlivesPredicate<GenericArg<'tcx>, Region<'tcx>>, ConstraintCategory<'tcx>);
 
-TrivialTypeTraversalImpls! {
-    crate::infer::canonical::Certainty,
-    crate::infer::canonical::CanonicalTyVarKind,
-}
-
 impl<'tcx> CanonicalVarValues<'tcx> {
     // Given a list of canonical variables, construct a set of values which are
     // the identity response.

compiler/rustc_middle/src/mir/basic_blocks.rs

@@ -181,8 +181,6 @@ impl<'tcx> graph::WithPredecessors for BasicBlocks<'tcx> {
     }
 }
 
-TrivialTypeTraversalImpls! { Cache }
-
 impl<S: Encoder> Encodable<S> for Cache {
     #[inline]
     fn encode(&self, _s: &mut S) {}

compiler/rustc_middle/src/mir/coverage.rs

@@ -53,7 +53,7 @@ impl ExpressionId {
 /// but the zero/counter/expression distinction is also useful for representing
 /// the value of code/gap mappings, and the true/false arms of branch mappings.
 #[derive(Copy, Clone, PartialEq, Eq)]
-#[derive(TyEncodable, TyDecodable, Hash, HashStable, TypeFoldable, TypeVisitable)]
+#[derive(TyEncodable, TyDecodable, Hash, HashStable)]
 pub enum CovTerm {
     Zero,
     Counter(CounterId),
@@ -70,7 +70,7 @@ impl Debug for CovTerm {
     }
 }
 
-#[derive(Clone, PartialEq, TyEncodable, TyDecodable, Hash, HashStable, TypeFoldable, TypeVisitable)]
+#[derive(Clone, PartialEq, TyEncodable, TyDecodable, Hash, HashStable)]
 pub enum CoverageKind {
     /// Marks the point in MIR control flow represented by a coverage counter.
     ///
@@ -102,7 +102,6 @@ impl Debug for CoverageKind {
 }
 
 #[derive(Clone, TyEncodable, TyDecodable, Hash, HashStable, PartialEq, Eq, PartialOrd, Ord)]
-#[derive(TypeFoldable, TypeVisitable)]
 pub struct CodeRegion {
     pub file_name: Symbol,
     pub start_line: u32,
@@ -122,7 +121,6 @@ impl Debug for CodeRegion {
 }
 
 #[derive(Copy, Clone, Debug, PartialEq, TyEncodable, TyDecodable, Hash, HashStable)]
-#[derive(TypeFoldable, TypeVisitable)]
 pub enum Op {
     Subtract,
     Add,
@@ -139,15 +137,15 @@ impl Op {
 }
 
 #[derive(Clone, Debug)]
-#[derive(TyEncodable, TyDecodable, Hash, HashStable, TypeFoldable, TypeVisitable)]
+#[derive(TyEncodable, TyDecodable, Hash, HashStable)]
 pub struct Expression {
     pub lhs: CovTerm,
     pub op: Op,
     pub rhs: CovTerm,
 }
 
 #[derive(Clone, Debug)]
-#[derive(TyEncodable, TyDecodable, Hash, HashStable, TypeFoldable, TypeVisitable)]
+#[derive(TyEncodable, TyDecodable, Hash, HashStable)]
 pub struct Mapping {
     pub code_region: CodeRegion,
 
@@ -164,7 +162,7 @@ pub struct Mapping {
 /// to be used in conjunction with the individual coverage statements injected
 /// into the function's basic blocks.
 #[derive(Clone, Debug)]
-#[derive(TyEncodable, TyDecodable, Hash, HashStable, TypeFoldable, TypeVisitable)]
+#[derive(TyEncodable, TyDecodable, Hash, HashStable)]
 pub struct FunctionCoverageInfo {
     pub function_source_hash: u64,
     pub num_counters: usize,

compiler/rustc_middle/src/mir/interpret/error.rs

@@ -82,8 +82,6 @@ impl Into<ErrorGuaranteed> for ReportedErrorInfo {
     }
 }
 
-TrivialTypeTraversalImpls! { ErrorHandled }
-
 pub type EvalToAllocationRawResult<'tcx> = Result<ConstAlloc<'tcx>, ErrorHandled>;
 pub type EvalToConstValueResult<'tcx> = Result<ConstValue<'tcx>, ErrorHandled>;
 /// `Ok(None)` indicates the constant was fine, but the valtree couldn't be constructed.

compiler/rustc_middle/src/mir/mod.rs

@@ -1414,7 +1414,7 @@ pub struct SourceScopeLocalData {
 /// The first will lead to the constraint `w: &'1 str` (for some
 /// inferred region `'1`). The second will lead to the constraint `w:
 /// &'static str`.
-#[derive(Clone, Debug, TyEncodable, TyDecodable, HashStable, TypeFoldable, TypeVisitable)]
+#[derive(Clone, Debug, TyEncodable, TyDecodable, HashStable)]
 pub struct UserTypeProjections {
     pub contents: Vec<(UserTypeProjection, Span)>,
 }

compiler/rustc_middle/src/mir/query.rs

@@ -374,7 +374,7 @@ pub enum ConstraintCategory<'tcx> {
 }
 
 #[derive(Copy, Clone, Debug, Eq, PartialEq, PartialOrd, Ord, Hash)]
-#[derive(TyEncodable, TyDecodable, HashStable, TypeVisitable, TypeFoldable)]
+#[derive(TyEncodable, TyDecodable, HashStable)]
 pub enum ReturnConstraint {
     Normal,
     ClosureUpvar(FieldIdx),

compiler/rustc_middle/src/mir/syntax.rs

@@ -520,7 +520,6 @@ pub enum FakeReadCause {
 }
 
 #[derive(Clone, Debug, PartialEq, TyEncodable, TyDecodable, Hash, HashStable)]
-#[derive(TypeFoldable, TypeVisitable)]
 pub struct Coverage {
     pub kind: CoverageKind,
 }
@@ -536,7 +535,6 @@ pub struct CopyNonOverlapping<'tcx> {
 
 /// Represents how a `TerminatorKind::Call` was constructed, used for diagnostics
 #[derive(Clone, Copy, TyEncodable, TyDecodable, Debug, PartialEq, Hash, HashStable)]
-#[derive(TypeFoldable, TypeVisitable)]
 pub enum CallSource {
     /// This came from something such as `a > b` or `a + b`. In THIR, if `from_hir_call`
     /// is false then this is the desugaring.
@@ -850,7 +848,6 @@ pub struct SwitchTargets {
 
 /// Action to be taken when a stack unwind happens.
 #[derive(Copy, Clone, Debug, PartialEq, Eq, TyEncodable, TyDecodable, Hash, HashStable)]
-#[derive(TypeFoldable, TypeVisitable)]
 pub enum UnwindAction {
     /// No action is to be taken. Continue unwinding.
     ///
@@ -869,7 +866,6 @@ pub enum UnwindAction {
 
 /// The reason we are terminating the process during unwinding.
 #[derive(Copy, Clone, Debug, PartialEq, Eq, TyEncodable, TyDecodable, Hash, HashStable)]
-#[derive(TypeFoldable, TypeVisitable)]
 pub enum UnwindTerminateReason {
     /// Unwinding is just not possible given the ABI of this function.
     Abi,
@@ -1362,7 +1358,7 @@ pub enum NullOp<'tcx> {
 }
 
 #[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
-#[derive(HashStable, TyEncodable, TyDecodable, TypeFoldable, TypeVisitable)]
+#[derive(HashStable, TyEncodable, TyDecodable)]
 pub enum UnOp {
     /// The `!` operator for logical inversion
     Not,
@@ -1371,7 +1367,7 @@ pub enum UnOp {
 }
 
 #[derive(Copy, Clone, Debug, PartialEq, PartialOrd, Ord, Eq, Hash)]
-#[derive(TyEncodable, TyDecodable, HashStable, TypeFoldable, TypeVisitable)]
+#[derive(TyEncodable, TyDecodable, HashStable)]
 pub enum BinOp {
     /// The `+` operator (addition)
     Add,

compiler/rustc_middle/src/mir/type_foldable.rs

@@ -1,51 +1,8 @@
 //! `TypeFoldable` implementations for MIR types
 
-use rustc_ast::InlineAsmTemplatePiece;
-
 use super::*;
 use crate::ty;
 
-TrivialTypeTraversalImpls! {
-    BlockTailInfo,
-    MirPhase,
-    SourceInfo,
-    FakeReadCause,
-    RetagKind,
-    SourceScope,
-    SourceScopeLocalData,
-    UserTypeAnnotationIndex,
-    BorrowKind,
-    CastKind,
-    hir::Movability,
-    BasicBlock,
-    SwitchTargets,
-    CoroutineKind,
-    CoroutineSavedLocal,
-}
-
-TrivialTypeTraversalImpls! {
-    ConstValue<'tcx>,
-    NullOp<'tcx>,
-}
-
-impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for &'tcx [InlineAsmTemplatePiece] {
-    fn try_fold_with<F: FallibleTypeFolder<TyCtxt<'tcx>>>(
-        self,
-        _folder: &mut F,
-    ) -> Result<Self, F::Error> {
-        Ok(self)
-    }
-}
-
-impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for &'tcx [Span] {
-    fn try_fold_with<F: FallibleTypeFolder<TyCtxt<'tcx>>>(
-        self,
-        _folder: &mut F,
-    ) -> Result<Self, F::Error> {
-        Ok(self)
-    }
-}
-
 impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for &'tcx ty::List<PlaceElem<'tcx>> {
     fn try_fold_with<F: FallibleTypeFolder<TyCtxt<'tcx>>>(
         self,

compiler/rustc_middle/src/traits/mod.rs

@@ -460,7 +460,6 @@ pub enum ObligationCauseCode<'tcx> {
 /// we can walk in order to obtain precise spans for any
 /// 'nested' types (e.g. `Foo` in `Option<Foo>`).
 #[derive(Copy, Clone, Debug, PartialEq, Eq, Hash, HashStable, Encodable, Decodable)]
-#[derive(TypeVisitable, TypeFoldable)]
 pub enum WellFormedLoc {
     /// Use the type of the provided definition.
     Ty(LocalDefId),
@@ -737,8 +736,6 @@ pub enum BuiltinImplSource {
     TupleUnsizing,
 }
 
-TrivialTypeTraversalImpls! { BuiltinImplSource }
-
 #[derive(Clone, Debug, PartialEq, Eq, Hash, HashStable, PartialOrd, Ord)]
 pub enum ObjectSafetyViolation {
     /// `Self: Sized` declared on the trait.
@@ -936,7 +933,7 @@ pub enum CodegenObligationError {
     FulfillmentError,
 }
 
-#[derive(Debug, PartialEq, Eq, Clone, Copy, Hash, HashStable, TypeFoldable, TypeVisitable)]
+#[derive(Debug, PartialEq, Eq, Clone, Copy, Hash, HashStable)]
 pub enum DefiningAnchor {
     /// `DefId` of the item.
     Bind(LocalDefId),

compiler/rustc_middle/src/traits/select.rs

@@ -309,8 +309,6 @@ impl From<ErrorGuaranteed> for OverflowError {
     }
 }
 
-TrivialTypeTraversalImpls! { OverflowError }
-
 impl<'tcx> From<OverflowError> for SelectionError<'tcx> {
     fn from(overflow_error: OverflowError) -> SelectionError<'tcx> {
         match overflow_error {

compiler/rustc_middle/src/traits/solve.rs

@@ -49,7 +49,7 @@ pub struct Response<'tcx> {
     pub external_constraints: ExternalConstraints<'tcx>,
 }
 
-#[derive(Debug, PartialEq, Eq, Clone, Copy, Hash, HashStable, TypeFoldable, TypeVisitable)]
+#[derive(Debug, PartialEq, Eq, Clone, Copy, Hash, HashStable)]
 pub enum Certainty {
     Yes,
     Maybe(MaybeCause),
@@ -89,7 +89,7 @@ impl Certainty {
 }
 
 /// Why we failed to evaluate a goal.
-#[derive(Debug, PartialEq, Eq, Clone, Copy, Hash, HashStable, TypeFoldable, TypeVisitable)]
+#[derive(Debug, PartialEq, Eq, Clone, Copy, Hash, HashStable)]
 pub enum MaybeCause {
     /// We failed due to ambiguity. This ambiguity can either
     /// be a true ambiguity, i.e. there are multiple different answers,

compiler/rustc_middle/src/ty/abstract_const.rs

@@ -6,7 +6,7 @@ use crate::ty::{
 use rustc_errors::ErrorGuaranteed;
 
 #[derive(Hash, Debug, Clone, Copy, Ord, PartialOrd, PartialEq, Eq)]
-#[derive(TyDecodable, TyEncodable, HashStable, TypeVisitable, TypeFoldable)]
+#[derive(TyDecodable, TyEncodable, HashStable)]
 pub enum CastKind {
     /// thir::ExprKind::As
     As,
@@ -27,8 +27,6 @@ impl From<ErrorGuaranteed> for NotConstEvaluatable {
     }
 }
 
-TrivialTypeTraversalImpls! { NotConstEvaluatable }
-
 pub type BoundAbstractConst<'tcx> = Result<Option<EarlyBinder<ty::Const<'tcx>>>, ErrorGuaranteed>;
 
 impl<'tcx> TyCtxt<'tcx> {

compiler/rustc_middle/src/ty/binding.rs

@@ -6,8 +6,6 @@ pub enum BindingMode {
     BindByValue(Mutability),
 }
 
-TrivialTypeTraversalImpls! { BindingMode }
-
 impl BindingMode {
     pub fn convert(BindingAnnotation(by_ref, mutbl): BindingAnnotation) -> BindingMode {
         match by_ref {

compiler/rustc_middle/src/ty/closure.rs

@@ -23,7 +23,6 @@ use self::BorrowKind::*;
 pub const CAPTURE_STRUCT_LOCAL: mir::Local = mir::Local::from_u32(1);
 
 #[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, TyEncodable, TyDecodable, HashStable)]
-#[derive(TypeFoldable, TypeVisitable)]
 pub struct UpvarPath {
     pub hir_id: hir::HirId,
 }
@@ -32,7 +31,6 @@ pub struct UpvarPath {
 /// the original var ID (that is, the root variable that is referenced
 /// by the upvar) and the ID of the closure expression.
 #[derive(Clone, Copy, PartialEq, Eq, Hash, TyEncodable, TyDecodable, HashStable)]
-#[derive(TypeFoldable, TypeVisitable)]
 pub struct UpvarId {
     pub var_path: UpvarPath,
     pub closure_expr_id: LocalDefId,
@@ -47,7 +45,6 @@ impl UpvarId {
 /// Information describing the capture of an upvar. This is computed
 /// during `typeck`, specifically by `regionck`.
 #[derive(PartialEq, Clone, Debug, Copy, TyEncodable, TyDecodable, HashStable)]
-#[derive(TypeFoldable, TypeVisitable)]
 pub enum UpvarCapture {
     /// Upvar is captured by value. This is always true when the
     /// closure is labeled `move`, but can also be true in other cases
@@ -314,7 +311,6 @@ pub fn is_ancestor_or_same_capture(
 /// for a particular capture as well as identifying the part of the source code
 /// that triggered this capture to occur.
 #[derive(PartialEq, Clone, Debug, Copy, TyEncodable, TyDecodable, HashStable)]
-#[derive(TypeFoldable, TypeVisitable)]
 pub struct CaptureInfo {
     /// Expr Id pointing to use that resulted in selecting the current capture kind
     ///
@@ -393,7 +389,6 @@ pub fn place_to_string_for_capture<'tcx>(tcx: TyCtxt<'tcx>, place: &HirPlace<'tc
 }
 
 #[derive(Clone, PartialEq, Debug, TyEncodable, TyDecodable, Copy, HashStable)]
-#[derive(TypeFoldable, TypeVisitable)]
 pub enum BorrowKind {
     /// Data must be immutable and is aliasable.
     ImmBorrow,

compiler/rustc_middle/src/ty/mod.rs

@@ -283,7 +283,6 @@ impl fmt::Display for ImplPolarity {
 }
 
 #[derive(Copy, Clone, PartialEq, Eq, Hash, TyEncodable, TyDecodable, HashStable, Debug)]
-#[derive(TypeFoldable, TypeVisitable)]
 pub enum Asyncness {
     Yes,
     No,