Merging upstream version 1.71.1+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 3341 insertions, 0 deletions

diff --git a/vendor/syn-1.0.109/src/gen/fold.rs b/vendor/syn-1.0.109/src/gen/fold.rs
new file mode 100644
index 000000000..98bb5794a
--- /dev/null
+++ b/vendor/syn-1.0.109/src/gen/fold.rs
@@ -0,0 +1,3341 @@
+// This file is @generated by syn-internal-codegen.
+// It is not intended for manual editing.
+
+#![allow(unreachable_code, unused_variables)]
+#![allow(clippy::match_wildcard_for_single_variants)]
+#[cfg(any(feature = "full", feature = "derive"))]
+use crate::gen::helper::fold::*;
+#[cfg(any(feature = "full", feature = "derive"))]
+use crate::token::{Brace, Bracket, Group, Paren};
+use crate::*;
+use proc_macro2::Span;
+#[cfg(feature = "full")]
+macro_rules! full {
+    ($e:expr) => {
+        $e
+    };
+}
+#[cfg(all(feature = "derive", not(feature = "full")))]
+macro_rules! full {
+    ($e:expr) => {
+        unreachable!()
+    };
+}
+/// Syntax tree traversal to transform the nodes of an owned syntax tree.
+///
+/// See the [module documentation] for details.
+///
+/// [module documentation]: self
+///
+/// *This trait is available only if Syn is built with the `"fold"` feature.*
+pub trait Fold {
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_abi(&mut self, i: Abi) -> Abi {
+        fold_abi(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_angle_bracketed_generic_arguments(
+        &mut self,
+        i: AngleBracketedGenericArguments,
+    ) -> AngleBracketedGenericArguments {
+        fold_angle_bracketed_generic_arguments(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_arm(&mut self, i: Arm) -> Arm {
+        fold_arm(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_attr_style(&mut self, i: AttrStyle) -> AttrStyle {
+        fold_attr_style(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_attribute(&mut self, i: Attribute) -> Attribute {
+        fold_attribute(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_bare_fn_arg(&mut self, i: BareFnArg) -> BareFnArg {
+        fold_bare_fn_arg(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_bin_op(&mut self, i: BinOp) -> BinOp {
+        fold_bin_op(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_binding(&mut self, i: Binding) -> Binding {
+        fold_binding(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_block(&mut self, i: Block) -> Block {
+        fold_block(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_bound_lifetimes(&mut self, i: BoundLifetimes) -> BoundLifetimes {
+        fold_bound_lifetimes(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_const_param(&mut self, i: ConstParam) -> ConstParam {
+        fold_const_param(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_constraint(&mut self, i: Constraint) -> Constraint {
+        fold_constraint(self, i)
+    }
+    #[cfg(feature = "derive")]
+    fn fold_data(&mut self, i: Data) -> Data {
+        fold_data(self, i)
+    }
+    #[cfg(feature = "derive")]
+    fn fold_data_enum(&mut self, i: DataEnum) -> DataEnum {
+        fold_data_enum(self, i)
+    }
+    #[cfg(feature = "derive")]
+    fn fold_data_struct(&mut self, i: DataStruct) -> DataStruct {
+        fold_data_struct(self, i)
+    }
+    #[cfg(feature = "derive")]
+    fn fold_data_union(&mut self, i: DataUnion) -> DataUnion {
+        fold_data_union(self, i)
+    }
+    #[cfg(feature = "derive")]
+    fn fold_derive_input(&mut self, i: DeriveInput) -> DeriveInput {
+        fold_derive_input(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_expr(&mut self, i: Expr) -> Expr {
+        fold_expr(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_expr_array(&mut self, i: ExprArray) -> ExprArray {
+        fold_expr_array(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_expr_assign(&mut self, i: ExprAssign) -> ExprAssign {
+        fold_expr_assign(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_expr_assign_op(&mut self, i: ExprAssignOp) -> ExprAssignOp {
+        fold_expr_assign_op(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_expr_async(&mut self, i: ExprAsync) -> ExprAsync {
+        fold_expr_async(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_expr_await(&mut self, i: ExprAwait) -> ExprAwait {
+        fold_expr_await(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_expr_binary(&mut self, i: ExprBinary) -> ExprBinary {
+        fold_expr_binary(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_expr_block(&mut self, i: ExprBlock) -> ExprBlock {
+        fold_expr_block(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_expr_box(&mut self, i: ExprBox) -> ExprBox {
+        fold_expr_box(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_expr_break(&mut self, i: ExprBreak) -> ExprBreak {
+        fold_expr_break(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_expr_call(&mut self, i: ExprCall) -> ExprCall {
+        fold_expr_call(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_expr_cast(&mut self, i: ExprCast) -> ExprCast {
+        fold_expr_cast(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_expr_closure(&mut self, i: ExprClosure) -> ExprClosure {
+        fold_expr_closure(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_expr_continue(&mut self, i: ExprContinue) -> ExprContinue {
+        fold_expr_continue(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_expr_field(&mut self, i: ExprField) -> ExprField {
+        fold_expr_field(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_expr_for_loop(&mut self, i: ExprForLoop) -> ExprForLoop {
+        fold_expr_for_loop(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_expr_group(&mut self, i: ExprGroup) -> ExprGroup {
+        fold_expr_group(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_expr_if(&mut self, i: ExprIf) -> ExprIf {
+        fold_expr_if(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_expr_index(&mut self, i: ExprIndex) -> ExprIndex {
+        fold_expr_index(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_expr_let(&mut self, i: ExprLet) -> ExprLet {
+        fold_expr_let(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_expr_lit(&mut self, i: ExprLit) -> ExprLit {
+        fold_expr_lit(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_expr_loop(&mut self, i: ExprLoop) -> ExprLoop {
+        fold_expr_loop(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_expr_macro(&mut self, i: ExprMacro) -> ExprMacro {
+        fold_expr_macro(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_expr_match(&mut self, i: ExprMatch) -> ExprMatch {
+        fold_expr_match(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_expr_method_call(&mut self, i: ExprMethodCall) -> ExprMethodCall {
+        fold_expr_method_call(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_expr_paren(&mut self, i: ExprParen) -> ExprParen {
+        fold_expr_paren(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_expr_path(&mut self, i: ExprPath) -> ExprPath {
+        fold_expr_path(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_expr_range(&mut self, i: ExprRange) -> ExprRange {
+        fold_expr_range(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_expr_reference(&mut self, i: ExprReference) -> ExprReference {
+        fold_expr_reference(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_expr_repeat(&mut self, i: ExprRepeat) -> ExprRepeat {
+        fold_expr_repeat(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_expr_return(&mut self, i: ExprReturn) -> ExprReturn {
+        fold_expr_return(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_expr_struct(&mut self, i: ExprStruct) -> ExprStruct {
+        fold_expr_struct(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_expr_try(&mut self, i: ExprTry) -> ExprTry {
+        fold_expr_try(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_expr_try_block(&mut self, i: ExprTryBlock) -> ExprTryBlock {
+        fold_expr_try_block(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_expr_tuple(&mut self, i: ExprTuple) -> ExprTuple {
+        fold_expr_tuple(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_expr_type(&mut self, i: ExprType) -> ExprType {
+        fold_expr_type(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_expr_unary(&mut self, i: ExprUnary) -> ExprUnary {
+        fold_expr_unary(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_expr_unsafe(&mut self, i: ExprUnsafe) -> ExprUnsafe {
+        fold_expr_unsafe(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_expr_while(&mut self, i: ExprWhile) -> ExprWhile {
+        fold_expr_while(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_expr_yield(&mut self, i: ExprYield) -> ExprYield {
+        fold_expr_yield(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_field(&mut self, i: Field) -> Field {
+        fold_field(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_field_pat(&mut self, i: FieldPat) -> FieldPat {
+        fold_field_pat(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_field_value(&mut self, i: FieldValue) -> FieldValue {
+        fold_field_value(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_fields(&mut self, i: Fields) -> Fields {
+        fold_fields(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_fields_named(&mut self, i: FieldsNamed) -> FieldsNamed {
+        fold_fields_named(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_fields_unnamed(&mut self, i: FieldsUnnamed) -> FieldsUnnamed {
+        fold_fields_unnamed(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_file(&mut self, i: File) -> File {
+        fold_file(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_fn_arg(&mut self, i: FnArg) -> FnArg {
+        fold_fn_arg(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_foreign_item(&mut self, i: ForeignItem) -> ForeignItem {
+        fold_foreign_item(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_foreign_item_fn(&mut self, i: ForeignItemFn) -> ForeignItemFn {
+        fold_foreign_item_fn(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_foreign_item_macro(&mut self, i: ForeignItemMacro) -> ForeignItemMacro {
+        fold_foreign_item_macro(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_foreign_item_static(&mut self, i: ForeignItemStatic) -> ForeignItemStatic {
+        fold_foreign_item_static(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_foreign_item_type(&mut self, i: ForeignItemType) -> ForeignItemType {
+        fold_foreign_item_type(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_generic_argument(&mut self, i: GenericArgument) -> GenericArgument {
+        fold_generic_argument(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_generic_method_argument(
+        &mut self,
+        i: GenericMethodArgument,
+    ) -> GenericMethodArgument {
+        fold_generic_method_argument(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_generic_param(&mut self, i: GenericParam) -> GenericParam {
+        fold_generic_param(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_generics(&mut self, i: Generics) -> Generics {
+        fold_generics(self, i)
+    }
+    fn fold_ident(&mut self, i: Ident) -> Ident {
+        fold_ident(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_impl_item(&mut self, i: ImplItem) -> ImplItem {
+        fold_impl_item(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_impl_item_const(&mut self, i: ImplItemConst) -> ImplItemConst {
+        fold_impl_item_const(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_impl_item_macro(&mut self, i: ImplItemMacro) -> ImplItemMacro {
+        fold_impl_item_macro(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_impl_item_method(&mut self, i: ImplItemMethod) -> ImplItemMethod {
+        fold_impl_item_method(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_impl_item_type(&mut self, i: ImplItemType) -> ImplItemType {
+        fold_impl_item_type(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_index(&mut self, i: Index) -> Index {
+        fold_index(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_item(&mut self, i: Item) -> Item {
+        fold_item(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_item_const(&mut self, i: ItemConst) -> ItemConst {
+        fold_item_const(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_item_enum(&mut self, i: ItemEnum) -> ItemEnum {
+        fold_item_enum(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_item_extern_crate(&mut self, i: ItemExternCrate) -> ItemExternCrate {
+        fold_item_extern_crate(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_item_fn(&mut self, i: ItemFn) -> ItemFn {
+        fold_item_fn(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_item_foreign_mod(&mut self, i: ItemForeignMod) -> ItemForeignMod {
+        fold_item_foreign_mod(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_item_impl(&mut self, i: ItemImpl) -> ItemImpl {
+        fold_item_impl(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_item_macro(&mut self, i: ItemMacro) -> ItemMacro {
+        fold_item_macro(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_item_macro2(&mut self, i: ItemMacro2) -> ItemMacro2 {
+        fold_item_macro2(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_item_mod(&mut self, i: ItemMod) -> ItemMod {
+        fold_item_mod(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_item_static(&mut self, i: ItemStatic) -> ItemStatic {
+        fold_item_static(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_item_struct(&mut self, i: ItemStruct) -> ItemStruct {
+        fold_item_struct(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_item_trait(&mut self, i: ItemTrait) -> ItemTrait {
+        fold_item_trait(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_item_trait_alias(&mut self, i: ItemTraitAlias) -> ItemTraitAlias {
+        fold_item_trait_alias(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_item_type(&mut self, i: ItemType) -> ItemType {
+        fold_item_type(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_item_union(&mut self, i: ItemUnion) -> ItemUnion {
+        fold_item_union(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_item_use(&mut self, i: ItemUse) -> ItemUse {
+        fold_item_use(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_label(&mut self, i: Label) -> Label {
+        fold_label(self, i)
+    }
+    fn fold_lifetime(&mut self, i: Lifetime) -> Lifetime {
+        fold_lifetime(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_lifetime_def(&mut self, i: LifetimeDef) -> LifetimeDef {
+        fold_lifetime_def(self, i)
+    }
+    fn fold_lit(&mut self, i: Lit) -> Lit {
+        fold_lit(self, i)
+    }
+    fn fold_lit_bool(&mut self, i: LitBool) -> LitBool {
+        fold_lit_bool(self, i)
+    }
+    fn fold_lit_byte(&mut self, i: LitByte) -> LitByte {
+        fold_lit_byte(self, i)
+    }
+    fn fold_lit_byte_str(&mut self, i: LitByteStr) -> LitByteStr {
+        fold_lit_byte_str(self, i)
+    }
+    fn fold_lit_char(&mut self, i: LitChar) -> LitChar {
+        fold_lit_char(self, i)
+    }
+    fn fold_lit_float(&mut self, i: LitFloat) -> LitFloat {
+        fold_lit_float(self, i)
+    }
+    fn fold_lit_int(&mut self, i: LitInt) -> LitInt {
+        fold_lit_int(self, i)
+    }
+    fn fold_lit_str(&mut self, i: LitStr) -> LitStr {
+        fold_lit_str(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_local(&mut self, i: Local) -> Local {
+        fold_local(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_macro(&mut self, i: Macro) -> Macro {
+        fold_macro(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_macro_delimiter(&mut self, i: MacroDelimiter) -> MacroDelimiter {
+        fold_macro_delimiter(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_member(&mut self, i: Member) -> Member {
+        fold_member(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_meta(&mut self, i: Meta) -> Meta {
+        fold_meta(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_meta_list(&mut self, i: MetaList) -> MetaList {
+        fold_meta_list(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_meta_name_value(&mut self, i: MetaNameValue) -> MetaNameValue {
+        fold_meta_name_value(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_method_turbofish(&mut self, i: MethodTurbofish) -> MethodTurbofish {
+        fold_method_turbofish(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_nested_meta(&mut self, i: NestedMeta) -> NestedMeta {
+        fold_nested_meta(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_parenthesized_generic_arguments(
+        &mut self,
+        i: ParenthesizedGenericArguments,
+    ) -> ParenthesizedGenericArguments {
+        fold_parenthesized_generic_arguments(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_pat(&mut self, i: Pat) -> Pat {
+        fold_pat(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_pat_box(&mut self, i: PatBox) -> PatBox {
+        fold_pat_box(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_pat_ident(&mut self, i: PatIdent) -> PatIdent {
+        fold_pat_ident(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_pat_lit(&mut self, i: PatLit) -> PatLit {
+        fold_pat_lit(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_pat_macro(&mut self, i: PatMacro) -> PatMacro {
+        fold_pat_macro(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_pat_or(&mut self, i: PatOr) -> PatOr {
+        fold_pat_or(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_pat_path(&mut self, i: PatPath) -> PatPath {
+        fold_pat_path(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_pat_range(&mut self, i: PatRange) -> PatRange {
+        fold_pat_range(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_pat_reference(&mut self, i: PatReference) -> PatReference {
+        fold_pat_reference(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_pat_rest(&mut self, i: PatRest) -> PatRest {
+        fold_pat_rest(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_pat_slice(&mut self, i: PatSlice) -> PatSlice {
+        fold_pat_slice(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_pat_struct(&mut self, i: PatStruct) -> PatStruct {
+        fold_pat_struct(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_pat_tuple(&mut self, i: PatTuple) -> PatTuple {
+        fold_pat_tuple(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_pat_tuple_struct(&mut self, i: PatTupleStruct) -> PatTupleStruct {
+        fold_pat_tuple_struct(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_pat_type(&mut self, i: PatType) -> PatType {
+        fold_pat_type(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_pat_wild(&mut self, i: PatWild) -> PatWild {
+        fold_pat_wild(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_path(&mut self, i: Path) -> Path {
+        fold_path(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_path_arguments(&mut self, i: PathArguments) -> PathArguments {
+        fold_path_arguments(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_path_segment(&mut self, i: PathSegment) -> PathSegment {
+        fold_path_segment(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_predicate_eq(&mut self, i: PredicateEq) -> PredicateEq {
+        fold_predicate_eq(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_predicate_lifetime(&mut self, i: PredicateLifetime) -> PredicateLifetime {
+        fold_predicate_lifetime(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_predicate_type(&mut self, i: PredicateType) -> PredicateType {
+        fold_predicate_type(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_qself(&mut self, i: QSelf) -> QSelf {
+        fold_qself(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_range_limits(&mut self, i: RangeLimits) -> RangeLimits {
+        fold_range_limits(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_receiver(&mut self, i: Receiver) -> Receiver {
+        fold_receiver(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_return_type(&mut self, i: ReturnType) -> ReturnType {
+        fold_return_type(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_signature(&mut self, i: Signature) -> Signature {
+        fold_signature(self, i)
+    }
+    fn fold_span(&mut self, i: Span) -> Span {
+        fold_span(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_stmt(&mut self, i: Stmt) -> Stmt {
+        fold_stmt(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_trait_bound(&mut self, i: TraitBound) -> TraitBound {
+        fold_trait_bound(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_trait_bound_modifier(
+        &mut self,
+        i: TraitBoundModifier,
+    ) -> TraitBoundModifier {
+        fold_trait_bound_modifier(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_trait_item(&mut self, i: TraitItem) -> TraitItem {
+        fold_trait_item(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_trait_item_const(&mut self, i: TraitItemConst) -> TraitItemConst {
+        fold_trait_item_const(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_trait_item_macro(&mut self, i: TraitItemMacro) -> TraitItemMacro {
+        fold_trait_item_macro(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_trait_item_method(&mut self, i: TraitItemMethod) -> TraitItemMethod {
+        fold_trait_item_method(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_trait_item_type(&mut self, i: TraitItemType) -> TraitItemType {
+        fold_trait_item_type(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_type(&mut self, i: Type) -> Type {
+        fold_type(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_type_array(&mut self, i: TypeArray) -> TypeArray {
+        fold_type_array(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_type_bare_fn(&mut self, i: TypeBareFn) -> TypeBareFn {
+        fold_type_bare_fn(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_type_group(&mut self, i: TypeGroup) -> TypeGroup {
+        fold_type_group(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_type_impl_trait(&mut self, i: TypeImplTrait) -> TypeImplTrait {
+        fold_type_impl_trait(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_type_infer(&mut self, i: TypeInfer) -> TypeInfer {
+        fold_type_infer(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_type_macro(&mut self, i: TypeMacro) -> TypeMacro {
+        fold_type_macro(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_type_never(&mut self, i: TypeNever) -> TypeNever {
+        fold_type_never(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_type_param(&mut self, i: TypeParam) -> TypeParam {
+        fold_type_param(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_type_param_bound(&mut self, i: TypeParamBound) -> TypeParamBound {
+        fold_type_param_bound(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_type_paren(&mut self, i: TypeParen) -> TypeParen {
+        fold_type_paren(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_type_path(&mut self, i: TypePath) -> TypePath {
+        fold_type_path(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_type_ptr(&mut self, i: TypePtr) -> TypePtr {
+        fold_type_ptr(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_type_reference(&mut self, i: TypeReference) -> TypeReference {
+        fold_type_reference(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_type_slice(&mut self, i: TypeSlice) -> TypeSlice {
+        fold_type_slice(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_type_trait_object(&mut self, i: TypeTraitObject) -> TypeTraitObject {
+        fold_type_trait_object(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_type_tuple(&mut self, i: TypeTuple) -> TypeTuple {
+        fold_type_tuple(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_un_op(&mut self, i: UnOp) -> UnOp {
+        fold_un_op(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_use_glob(&mut self, i: UseGlob) -> UseGlob {
+        fold_use_glob(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_use_group(&mut self, i: UseGroup) -> UseGroup {
+        fold_use_group(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_use_name(&mut self, i: UseName) -> UseName {
+        fold_use_name(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_use_path(&mut self, i: UsePath) -> UsePath {
+        fold_use_path(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_use_rename(&mut self, i: UseRename) -> UseRename {
+        fold_use_rename(self, i)
+    }
+    #[cfg(feature = "full")]
+    fn fold_use_tree(&mut self, i: UseTree) -> UseTree {
+        fold_use_tree(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_variadic(&mut self, i: Variadic) -> Variadic {
+        fold_variadic(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_variant(&mut self, i: Variant) -> Variant {
+        fold_variant(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_vis_crate(&mut self, i: VisCrate) -> VisCrate {
+        fold_vis_crate(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_vis_public(&mut self, i: VisPublic) -> VisPublic {
+        fold_vis_public(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_vis_restricted(&mut self, i: VisRestricted) -> VisRestricted {
+        fold_vis_restricted(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_visibility(&mut self, i: Visibility) -> Visibility {
+        fold_visibility(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_where_clause(&mut self, i: WhereClause) -> WhereClause {
+        fold_where_clause(self, i)
+    }
+    #[cfg(any(feature = "derive", feature = "full"))]
+    fn fold_where_predicate(&mut self, i: WherePredicate) -> WherePredicate {
+        fold_where_predicate(self, i)
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_abi<F>(f: &mut F, node: Abi) -> Abi
+where
+    F: Fold + ?Sized,
+{
+    Abi {
+        extern_token: Token![extern](tokens_helper(f, &node.extern_token.span)),
+        name: (node.name).map(|it| f.fold_lit_str(it)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_angle_bracketed_generic_arguments<F>(
+    f: &mut F,
+    node: AngleBracketedGenericArguments,
+) -> AngleBracketedGenericArguments
+where
+    F: Fold + ?Sized,
+{
+    AngleBracketedGenericArguments {
+        colon2_token: (node.colon2_token)
+            .map(|it| Token![::](tokens_helper(f, &it.spans))),
+        lt_token: Token![<](tokens_helper(f, &node.lt_token.spans)),
+        args: FoldHelper::lift(node.args, |it| f.fold_generic_argument(it)),
+        gt_token: Token![>](tokens_helper(f, &node.gt_token.spans)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_arm<F>(f: &mut F, node: Arm) -> Arm
+where
+    F: Fold + ?Sized,
+{
+    Arm {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        pat: f.fold_pat(node.pat),
+        guard: (node.guard)
+            .map(|it| (
+                Token![if](tokens_helper(f, &(it).0.span)),
+                Box::new(f.fold_expr(*(it).1)),
+            )),
+        fat_arrow_token: Token![=>](tokens_helper(f, &node.fat_arrow_token.spans)),
+        body: Box::new(f.fold_expr(*node.body)),
+        comma: (node.comma).map(|it| Token![,](tokens_helper(f, &it.spans))),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_attr_style<F>(f: &mut F, node: AttrStyle) -> AttrStyle
+where
+    F: Fold + ?Sized,
+{
+    match node {
+        AttrStyle::Outer => AttrStyle::Outer,
+        AttrStyle::Inner(_binding_0) => {
+            AttrStyle::Inner(Token![!](tokens_helper(f, &_binding_0.spans)))
+        }
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_attribute<F>(f: &mut F, node: Attribute) -> Attribute
+where
+    F: Fold + ?Sized,
+{
+    Attribute {
+        pound_token: Token![#](tokens_helper(f, &node.pound_token.spans)),
+        style: f.fold_attr_style(node.style),
+        bracket_token: Bracket(tokens_helper(f, &node.bracket_token.span)),
+        path: f.fold_path(node.path),
+        tokens: node.tokens,
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_bare_fn_arg<F>(f: &mut F, node: BareFnArg) -> BareFnArg
+where
+    F: Fold + ?Sized,
+{
+    BareFnArg {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        name: (node.name)
+            .map(|it| (
+                f.fold_ident((it).0),
+                Token![:](tokens_helper(f, &(it).1.spans)),
+            )),
+        ty: f.fold_type(node.ty),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_bin_op<F>(f: &mut F, node: BinOp) -> BinOp
+where
+    F: Fold + ?Sized,
+{
+    match node {
+        BinOp::Add(_binding_0) => {
+            BinOp::Add(Token![+](tokens_helper(f, &_binding_0.spans)))
+        }
+        BinOp::Sub(_binding_0) => {
+            BinOp::Sub(Token![-](tokens_helper(f, &_binding_0.spans)))
+        }
+        BinOp::Mul(_binding_0) => {
+            BinOp::Mul(Token![*](tokens_helper(f, &_binding_0.spans)))
+        }
+        BinOp::Div(_binding_0) => {
+            BinOp::Div(Token![/](tokens_helper(f, &_binding_0.spans)))
+        }
+        BinOp::Rem(_binding_0) => {
+            BinOp::Rem(Token![%](tokens_helper(f, &_binding_0.spans)))
+        }
+        BinOp::And(_binding_0) => {
+            BinOp::And(Token![&&](tokens_helper(f, &_binding_0.spans)))
+        }
+        BinOp::Or(_binding_0) => {
+            BinOp::Or(Token![||](tokens_helper(f, &_binding_0.spans)))
+        }
+        BinOp::BitXor(_binding_0) => {
+            BinOp::BitXor(Token![^](tokens_helper(f, &_binding_0.spans)))
+        }
+        BinOp::BitAnd(_binding_0) => {
+            BinOp::BitAnd(Token![&](tokens_helper(f, &_binding_0.spans)))
+        }
+        BinOp::BitOr(_binding_0) => {
+            BinOp::BitOr(Token![|](tokens_helper(f, &_binding_0.spans)))
+        }
+        BinOp::Shl(_binding_0) => {
+            BinOp::Shl(Token![<<](tokens_helper(f, &_binding_0.spans)))
+        }
+        BinOp::Shr(_binding_0) => {
+            BinOp::Shr(Token![>>](tokens_helper(f, &_binding_0.spans)))
+        }
+        BinOp::Eq(_binding_0) => {
+            BinOp::Eq(Token![==](tokens_helper(f, &_binding_0.spans)))
+        }
+        BinOp::Lt(_binding_0) => {
+            BinOp::Lt(Token![<](tokens_helper(f, &_binding_0.spans)))
+        }
+        BinOp::Le(_binding_0) => {
+            BinOp::Le(Token![<=](tokens_helper(f, &_binding_0.spans)))
+        }
+        BinOp::Ne(_binding_0) => {
+            BinOp::Ne(Token![!=](tokens_helper(f, &_binding_0.spans)))
+        }
+        BinOp::Ge(_binding_0) => {
+            BinOp::Ge(Token![>=](tokens_helper(f, &_binding_0.spans)))
+        }
+        BinOp::Gt(_binding_0) => {
+            BinOp::Gt(Token![>](tokens_helper(f, &_binding_0.spans)))
+        }
+        BinOp::AddEq(_binding_0) => {
+            BinOp::AddEq(Token![+=](tokens_helper(f, &_binding_0.spans)))
+        }
+        BinOp::SubEq(_binding_0) => {
+            BinOp::SubEq(Token![-=](tokens_helper(f, &_binding_0.spans)))
+        }
+        BinOp::MulEq(_binding_0) => {
+            BinOp::MulEq(Token![*=](tokens_helper(f, &_binding_0.spans)))
+        }
+        BinOp::DivEq(_binding_0) => {
+            BinOp::DivEq(Token![/=](tokens_helper(f, &_binding_0.spans)))
+        }
+        BinOp::RemEq(_binding_0) => {
+            BinOp::RemEq(Token![%=](tokens_helper(f, &_binding_0.spans)))
+        }
+        BinOp::BitXorEq(_binding_0) => {
+            BinOp::BitXorEq(Token![^=](tokens_helper(f, &_binding_0.spans)))
+        }
+        BinOp::BitAndEq(_binding_0) => {
+            BinOp::BitAndEq(Token![&=](tokens_helper(f, &_binding_0.spans)))
+        }
+        BinOp::BitOrEq(_binding_0) => {
+            BinOp::BitOrEq(Token![|=](tokens_helper(f, &_binding_0.spans)))
+        }
+        BinOp::ShlEq(_binding_0) => {
+            BinOp::ShlEq(Token![<<=](tokens_helper(f, &_binding_0.spans)))
+        }
+        BinOp::ShrEq(_binding_0) => {
+            BinOp::ShrEq(Token![>>=](tokens_helper(f, &_binding_0.spans)))
+        }
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_binding<F>(f: &mut F, node: Binding) -> Binding
+where
+    F: Fold + ?Sized,
+{
+    Binding {
+        ident: f.fold_ident(node.ident),
+        eq_token: Token![=](tokens_helper(f, &node.eq_token.spans)),
+        ty: f.fold_type(node.ty),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_block<F>(f: &mut F, node: Block) -> Block
+where
+    F: Fold + ?Sized,
+{
+    Block {
+        brace_token: Brace(tokens_helper(f, &node.brace_token.span)),
+        stmts: FoldHelper::lift(node.stmts, |it| f.fold_stmt(it)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_bound_lifetimes<F>(f: &mut F, node: BoundLifetimes) -> BoundLifetimes
+where
+    F: Fold + ?Sized,
+{
+    BoundLifetimes {
+        for_token: Token![for](tokens_helper(f, &node.for_token.span)),
+        lt_token: Token![<](tokens_helper(f, &node.lt_token.spans)),
+        lifetimes: FoldHelper::lift(node.lifetimes, |it| f.fold_lifetime_def(it)),
+        gt_token: Token![>](tokens_helper(f, &node.gt_token.spans)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_const_param<F>(f: &mut F, node: ConstParam) -> ConstParam
+where
+    F: Fold + ?Sized,
+{
+    ConstParam {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        const_token: Token![const](tokens_helper(f, &node.const_token.span)),
+        ident: f.fold_ident(node.ident),
+        colon_token: Token![:](tokens_helper(f, &node.colon_token.spans)),
+        ty: f.fold_type(node.ty),
+        eq_token: (node.eq_token).map(|it| Token![=](tokens_helper(f, &it.spans))),
+        default: (node.default).map(|it| f.fold_expr(it)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_constraint<F>(f: &mut F, node: Constraint) -> Constraint
+where
+    F: Fold + ?Sized,
+{
+    Constraint {
+        ident: f.fold_ident(node.ident),
+        colon_token: Token![:](tokens_helper(f, &node.colon_token.spans)),
+        bounds: FoldHelper::lift(node.bounds, |it| f.fold_type_param_bound(it)),
+    }
+}
+#[cfg(feature = "derive")]
+pub fn fold_data<F>(f: &mut F, node: Data) -> Data
+where
+    F: Fold + ?Sized,
+{
+    match node {
+        Data::Struct(_binding_0) => Data::Struct(f.fold_data_struct(_binding_0)),
+        Data::Enum(_binding_0) => Data::Enum(f.fold_data_enum(_binding_0)),
+        Data::Union(_binding_0) => Data::Union(f.fold_data_union(_binding_0)),
+    }
+}
+#[cfg(feature = "derive")]
+pub fn fold_data_enum<F>(f: &mut F, node: DataEnum) -> DataEnum
+where
+    F: Fold + ?Sized,
+{
+    DataEnum {
+        enum_token: Token![enum](tokens_helper(f, &node.enum_token.span)),
+        brace_token: Brace(tokens_helper(f, &node.brace_token.span)),
+        variants: FoldHelper::lift(node.variants, |it| f.fold_variant(it)),
+    }
+}
+#[cfg(feature = "derive")]
+pub fn fold_data_struct<F>(f: &mut F, node: DataStruct) -> DataStruct
+where
+    F: Fold + ?Sized,
+{
+    DataStruct {
+        struct_token: Token![struct](tokens_helper(f, &node.struct_token.span)),
+        fields: f.fold_fields(node.fields),
+        semi_token: (node.semi_token).map(|it| Token![;](tokens_helper(f, &it.spans))),
+    }
+}
+#[cfg(feature = "derive")]
+pub fn fold_data_union<F>(f: &mut F, node: DataUnion) -> DataUnion
+where
+    F: Fold + ?Sized,
+{
+    DataUnion {
+        union_token: Token![union](tokens_helper(f, &node.union_token.span)),
+        fields: f.fold_fields_named(node.fields),
+    }
+}
+#[cfg(feature = "derive")]
+pub fn fold_derive_input<F>(f: &mut F, node: DeriveInput) -> DeriveInput
+where
+    F: Fold + ?Sized,
+{
+    DeriveInput {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        vis: f.fold_visibility(node.vis),
+        ident: f.fold_ident(node.ident),
+        generics: f.fold_generics(node.generics),
+        data: f.fold_data(node.data),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_expr<F>(f: &mut F, node: Expr) -> Expr
+where
+    F: Fold + ?Sized,
+{
+    match node {
+        Expr::Array(_binding_0) => Expr::Array(full!(f.fold_expr_array(_binding_0))),
+        Expr::Assign(_binding_0) => Expr::Assign(full!(f.fold_expr_assign(_binding_0))),
+        Expr::AssignOp(_binding_0) => {
+            Expr::AssignOp(full!(f.fold_expr_assign_op(_binding_0)))
+        }
+        Expr::Async(_binding_0) => Expr::Async(full!(f.fold_expr_async(_binding_0))),
+        Expr::Await(_binding_0) => Expr::Await(full!(f.fold_expr_await(_binding_0))),
+        Expr::Binary(_binding_0) => Expr::Binary(f.fold_expr_binary(_binding_0)),
+        Expr::Block(_binding_0) => Expr::Block(full!(f.fold_expr_block(_binding_0))),
+        Expr::Box(_binding_0) => Expr::Box(full!(f.fold_expr_box(_binding_0))),
+        Expr::Break(_binding_0) => Expr::Break(full!(f.fold_expr_break(_binding_0))),
+        Expr::Call(_binding_0) => Expr::Call(f.fold_expr_call(_binding_0)),
+        Expr::Cast(_binding_0) => Expr::Cast(f.fold_expr_cast(_binding_0)),
+        Expr::Closure(_binding_0) => {
+            Expr::Closure(full!(f.fold_expr_closure(_binding_0)))
+        }
+        Expr::Continue(_binding_0) => {
+            Expr::Continue(full!(f.fold_expr_continue(_binding_0)))
+        }
+        Expr::Field(_binding_0) => Expr::Field(f.fold_expr_field(_binding_0)),
+        Expr::ForLoop(_binding_0) => {
+            Expr::ForLoop(full!(f.fold_expr_for_loop(_binding_0)))
+        }
+        Expr::Group(_binding_0) => Expr::Group(full!(f.fold_expr_group(_binding_0))),
+        Expr::If(_binding_0) => Expr::If(full!(f.fold_expr_if(_binding_0))),
+        Expr::Index(_binding_0) => Expr::Index(f.fold_expr_index(_binding_0)),
+        Expr::Let(_binding_0) => Expr::Let(full!(f.fold_expr_let(_binding_0))),
+        Expr::Lit(_binding_0) => Expr::Lit(f.fold_expr_lit(_binding_0)),
+        Expr::Loop(_binding_0) => Expr::Loop(full!(f.fold_expr_loop(_binding_0))),
+        Expr::Macro(_binding_0) => Expr::Macro(full!(f.fold_expr_macro(_binding_0))),
+        Expr::Match(_binding_0) => Expr::Match(full!(f.fold_expr_match(_binding_0))),
+        Expr::MethodCall(_binding_0) => {
+            Expr::MethodCall(full!(f.fold_expr_method_call(_binding_0)))
+        }
+        Expr::Paren(_binding_0) => Expr::Paren(f.fold_expr_paren(_binding_0)),
+        Expr::Path(_binding_0) => Expr::Path(f.fold_expr_path(_binding_0)),
+        Expr::Range(_binding_0) => Expr::Range(full!(f.fold_expr_range(_binding_0))),
+        Expr::Reference(_binding_0) => {
+            Expr::Reference(full!(f.fold_expr_reference(_binding_0)))
+        }
+        Expr::Repeat(_binding_0) => Expr::Repeat(full!(f.fold_expr_repeat(_binding_0))),
+        Expr::Return(_binding_0) => Expr::Return(full!(f.fold_expr_return(_binding_0))),
+        Expr::Struct(_binding_0) => Expr::Struct(full!(f.fold_expr_struct(_binding_0))),
+        Expr::Try(_binding_0) => Expr::Try(full!(f.fold_expr_try(_binding_0))),
+        Expr::TryBlock(_binding_0) => {
+            Expr::TryBlock(full!(f.fold_expr_try_block(_binding_0)))
+        }
+        Expr::Tuple(_binding_0) => Expr::Tuple(full!(f.fold_expr_tuple(_binding_0))),
+        Expr::Type(_binding_0) => Expr::Type(full!(f.fold_expr_type(_binding_0))),
+        Expr::Unary(_binding_0) => Expr::Unary(f.fold_expr_unary(_binding_0)),
+        Expr::Unsafe(_binding_0) => Expr::Unsafe(full!(f.fold_expr_unsafe(_binding_0))),
+        Expr::Verbatim(_binding_0) => Expr::Verbatim(_binding_0),
+        Expr::While(_binding_0) => Expr::While(full!(f.fold_expr_while(_binding_0))),
+        Expr::Yield(_binding_0) => Expr::Yield(full!(f.fold_expr_yield(_binding_0))),
+        #[cfg(syn_no_non_exhaustive)]
+        _ => unreachable!(),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_expr_array<F>(f: &mut F, node: ExprArray) -> ExprArray
+where
+    F: Fold + ?Sized,
+{
+    ExprArray {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        bracket_token: Bracket(tokens_helper(f, &node.bracket_token.span)),
+        elems: FoldHelper::lift(node.elems, |it| f.fold_expr(it)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_expr_assign<F>(f: &mut F, node: ExprAssign) -> ExprAssign
+where
+    F: Fold + ?Sized,
+{
+    ExprAssign {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        left: Box::new(f.fold_expr(*node.left)),
+        eq_token: Token![=](tokens_helper(f, &node.eq_token.spans)),
+        right: Box::new(f.fold_expr(*node.right)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_expr_assign_op<F>(f: &mut F, node: ExprAssignOp) -> ExprAssignOp
+where
+    F: Fold + ?Sized,
+{
+    ExprAssignOp {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        left: Box::new(f.fold_expr(*node.left)),
+        op: f.fold_bin_op(node.op),
+        right: Box::new(f.fold_expr(*node.right)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_expr_async<F>(f: &mut F, node: ExprAsync) -> ExprAsync
+where
+    F: Fold + ?Sized,
+{
+    ExprAsync {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        async_token: Token![async](tokens_helper(f, &node.async_token.span)),
+        capture: (node.capture).map(|it| Token![move](tokens_helper(f, &it.span))),
+        block: f.fold_block(node.block),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_expr_await<F>(f: &mut F, node: ExprAwait) -> ExprAwait
+where
+    F: Fold + ?Sized,
+{
+    ExprAwait {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        base: Box::new(f.fold_expr(*node.base)),
+        dot_token: Token![.](tokens_helper(f, &node.dot_token.spans)),
+        await_token: crate::token::Await(tokens_helper(f, &node.await_token.span)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_expr_binary<F>(f: &mut F, node: ExprBinary) -> ExprBinary
+where
+    F: Fold + ?Sized,
+{
+    ExprBinary {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        left: Box::new(f.fold_expr(*node.left)),
+        op: f.fold_bin_op(node.op),
+        right: Box::new(f.fold_expr(*node.right)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_expr_block<F>(f: &mut F, node: ExprBlock) -> ExprBlock
+where
+    F: Fold + ?Sized,
+{
+    ExprBlock {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        label: (node.label).map(|it| f.fold_label(it)),
+        block: f.fold_block(node.block),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_expr_box<F>(f: &mut F, node: ExprBox) -> ExprBox
+where
+    F: Fold + ?Sized,
+{
+    ExprBox {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        box_token: Token![box](tokens_helper(f, &node.box_token.span)),
+        expr: Box::new(f.fold_expr(*node.expr)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_expr_break<F>(f: &mut F, node: ExprBreak) -> ExprBreak
+where
+    F: Fold + ?Sized,
+{
+    ExprBreak {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        break_token: Token![break](tokens_helper(f, &node.break_token.span)),
+        label: (node.label).map(|it| f.fold_lifetime(it)),
+        expr: (node.expr).map(|it| Box::new(f.fold_expr(*it))),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_expr_call<F>(f: &mut F, node: ExprCall) -> ExprCall
+where
+    F: Fold + ?Sized,
+{
+    ExprCall {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        func: Box::new(f.fold_expr(*node.func)),
+        paren_token: Paren(tokens_helper(f, &node.paren_token.span)),
+        args: FoldHelper::lift(node.args, |it| f.fold_expr(it)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_expr_cast<F>(f: &mut F, node: ExprCast) -> ExprCast
+where
+    F: Fold + ?Sized,
+{
+    ExprCast {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        expr: Box::new(f.fold_expr(*node.expr)),
+        as_token: Token![as](tokens_helper(f, &node.as_token.span)),
+        ty: Box::new(f.fold_type(*node.ty)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_expr_closure<F>(f: &mut F, node: ExprClosure) -> ExprClosure
+where
+    F: Fold + ?Sized,
+{
+    ExprClosure {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        movability: (node.movability)
+            .map(|it| Token![static](tokens_helper(f, &it.span))),
+        asyncness: (node.asyncness).map(|it| Token![async](tokens_helper(f, &it.span))),
+        capture: (node.capture).map(|it| Token![move](tokens_helper(f, &it.span))),
+        or1_token: Token![|](tokens_helper(f, &node.or1_token.spans)),
+        inputs: FoldHelper::lift(node.inputs, |it| f.fold_pat(it)),
+        or2_token: Token![|](tokens_helper(f, &node.or2_token.spans)),
+        output: f.fold_return_type(node.output),
+        body: Box::new(f.fold_expr(*node.body)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_expr_continue<F>(f: &mut F, node: ExprContinue) -> ExprContinue
+where
+    F: Fold + ?Sized,
+{
+    ExprContinue {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        continue_token: Token![continue](tokens_helper(f, &node.continue_token.span)),
+        label: (node.label).map(|it| f.fold_lifetime(it)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_expr_field<F>(f: &mut F, node: ExprField) -> ExprField
+where
+    F: Fold + ?Sized,
+{
+    ExprField {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        base: Box::new(f.fold_expr(*node.base)),
+        dot_token: Token![.](tokens_helper(f, &node.dot_token.spans)),
+        member: f.fold_member(node.member),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_expr_for_loop<F>(f: &mut F, node: ExprForLoop) -> ExprForLoop
+where
+    F: Fold + ?Sized,
+{
+    ExprForLoop {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        label: (node.label).map(|it| f.fold_label(it)),
+        for_token: Token![for](tokens_helper(f, &node.for_token.span)),
+        pat: f.fold_pat(node.pat),
+        in_token: Token![in](tokens_helper(f, &node.in_token.span)),
+        expr: Box::new(f.fold_expr(*node.expr)),
+        body: f.fold_block(node.body),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_expr_group<F>(f: &mut F, node: ExprGroup) -> ExprGroup
+where
+    F: Fold + ?Sized,
+{
+    ExprGroup {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        group_token: Group(tokens_helper(f, &node.group_token.span)),
+        expr: Box::new(f.fold_expr(*node.expr)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_expr_if<F>(f: &mut F, node: ExprIf) -> ExprIf
+where
+    F: Fold + ?Sized,
+{
+    ExprIf {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        if_token: Token![if](tokens_helper(f, &node.if_token.span)),
+        cond: Box::new(f.fold_expr(*node.cond)),
+        then_branch: f.fold_block(node.then_branch),
+        else_branch: (node.else_branch)
+            .map(|it| (
+                Token![else](tokens_helper(f, &(it).0.span)),
+                Box::new(f.fold_expr(*(it).1)),
+            )),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_expr_index<F>(f: &mut F, node: ExprIndex) -> ExprIndex
+where
+    F: Fold + ?Sized,
+{
+    ExprIndex {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        expr: Box::new(f.fold_expr(*node.expr)),
+        bracket_token: Bracket(tokens_helper(f, &node.bracket_token.span)),
+        index: Box::new(f.fold_expr(*node.index)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_expr_let<F>(f: &mut F, node: ExprLet) -> ExprLet
+where
+    F: Fold + ?Sized,
+{
+    ExprLet {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        let_token: Token![let](tokens_helper(f, &node.let_token.span)),
+        pat: f.fold_pat(node.pat),
+        eq_token: Token![=](tokens_helper(f, &node.eq_token.spans)),
+        expr: Box::new(f.fold_expr(*node.expr)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_expr_lit<F>(f: &mut F, node: ExprLit) -> ExprLit
+where
+    F: Fold + ?Sized,
+{
+    ExprLit {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        lit: f.fold_lit(node.lit),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_expr_loop<F>(f: &mut F, node: ExprLoop) -> ExprLoop
+where
+    F: Fold + ?Sized,
+{
+    ExprLoop {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        label: (node.label).map(|it| f.fold_label(it)),
+        loop_token: Token![loop](tokens_helper(f, &node.loop_token.span)),
+        body: f.fold_block(node.body),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_expr_macro<F>(f: &mut F, node: ExprMacro) -> ExprMacro
+where
+    F: Fold + ?Sized,
+{
+    ExprMacro {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        mac: f.fold_macro(node.mac),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_expr_match<F>(f: &mut F, node: ExprMatch) -> ExprMatch
+where
+    F: Fold + ?Sized,
+{
+    ExprMatch {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        match_token: Token![match](tokens_helper(f, &node.match_token.span)),
+        expr: Box::new(f.fold_expr(*node.expr)),
+        brace_token: Brace(tokens_helper(f, &node.brace_token.span)),
+        arms: FoldHelper::lift(node.arms, |it| f.fold_arm(it)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_expr_method_call<F>(f: &mut F, node: ExprMethodCall) -> ExprMethodCall
+where
+    F: Fold + ?Sized,
+{
+    ExprMethodCall {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        receiver: Box::new(f.fold_expr(*node.receiver)),
+        dot_token: Token![.](tokens_helper(f, &node.dot_token.spans)),
+        method: f.fold_ident(node.method),
+        turbofish: (node.turbofish).map(|it| f.fold_method_turbofish(it)),
+        paren_token: Paren(tokens_helper(f, &node.paren_token.span)),
+        args: FoldHelper::lift(node.args, |it| f.fold_expr(it)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_expr_paren<F>(f: &mut F, node: ExprParen) -> ExprParen
+where
+    F: Fold + ?Sized,
+{
+    ExprParen {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        paren_token: Paren(tokens_helper(f, &node.paren_token.span)),
+        expr: Box::new(f.fold_expr(*node.expr)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_expr_path<F>(f: &mut F, node: ExprPath) -> ExprPath
+where
+    F: Fold + ?Sized,
+{
+    ExprPath {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        qself: (node.qself).map(|it| f.fold_qself(it)),
+        path: f.fold_path(node.path),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_expr_range<F>(f: &mut F, node: ExprRange) -> ExprRange
+where
+    F: Fold + ?Sized,
+{
+    ExprRange {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        from: (node.from).map(|it| Box::new(f.fold_expr(*it))),
+        limits: f.fold_range_limits(node.limits),
+        to: (node.to).map(|it| Box::new(f.fold_expr(*it))),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_expr_reference<F>(f: &mut F, node: ExprReference) -> ExprReference
+where
+    F: Fold + ?Sized,
+{
+    ExprReference {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        and_token: Token![&](tokens_helper(f, &node.and_token.spans)),
+        raw: node.raw,
+        mutability: (node.mutability).map(|it| Token![mut](tokens_helper(f, &it.span))),
+        expr: Box::new(f.fold_expr(*node.expr)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_expr_repeat<F>(f: &mut F, node: ExprRepeat) -> ExprRepeat
+where
+    F: Fold + ?Sized,
+{
+    ExprRepeat {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        bracket_token: Bracket(tokens_helper(f, &node.bracket_token.span)),
+        expr: Box::new(f.fold_expr(*node.expr)),
+        semi_token: Token![;](tokens_helper(f, &node.semi_token.spans)),
+        len: Box::new(f.fold_expr(*node.len)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_expr_return<F>(f: &mut F, node: ExprReturn) -> ExprReturn
+where
+    F: Fold + ?Sized,
+{
+    ExprReturn {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        return_token: Token![return](tokens_helper(f, &node.return_token.span)),
+        expr: (node.expr).map(|it| Box::new(f.fold_expr(*it))),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_expr_struct<F>(f: &mut F, node: ExprStruct) -> ExprStruct
+where
+    F: Fold + ?Sized,
+{
+    ExprStruct {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        path: f.fold_path(node.path),
+        brace_token: Brace(tokens_helper(f, &node.brace_token.span)),
+        fields: FoldHelper::lift(node.fields, |it| f.fold_field_value(it)),
+        dot2_token: (node.dot2_token).map(|it| Token![..](tokens_helper(f, &it.spans))),
+        rest: (node.rest).map(|it| Box::new(f.fold_expr(*it))),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_expr_try<F>(f: &mut F, node: ExprTry) -> ExprTry
+where
+    F: Fold + ?Sized,
+{
+    ExprTry {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        expr: Box::new(f.fold_expr(*node.expr)),
+        question_token: Token![?](tokens_helper(f, &node.question_token.spans)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_expr_try_block<F>(f: &mut F, node: ExprTryBlock) -> ExprTryBlock
+where
+    F: Fold + ?Sized,
+{
+    ExprTryBlock {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        try_token: Token![try](tokens_helper(f, &node.try_token.span)),
+        block: f.fold_block(node.block),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_expr_tuple<F>(f: &mut F, node: ExprTuple) -> ExprTuple
+where
+    F: Fold + ?Sized,
+{
+    ExprTuple {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        paren_token: Paren(tokens_helper(f, &node.paren_token.span)),
+        elems: FoldHelper::lift(node.elems, |it| f.fold_expr(it)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_expr_type<F>(f: &mut F, node: ExprType) -> ExprType
+where
+    F: Fold + ?Sized,
+{
+    ExprType {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        expr: Box::new(f.fold_expr(*node.expr)),
+        colon_token: Token![:](tokens_helper(f, &node.colon_token.spans)),
+        ty: Box::new(f.fold_type(*node.ty)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_expr_unary<F>(f: &mut F, node: ExprUnary) -> ExprUnary
+where
+    F: Fold + ?Sized,
+{
+    ExprUnary {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        op: f.fold_un_op(node.op),
+        expr: Box::new(f.fold_expr(*node.expr)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_expr_unsafe<F>(f: &mut F, node: ExprUnsafe) -> ExprUnsafe
+where
+    F: Fold + ?Sized,
+{
+    ExprUnsafe {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        unsafe_token: Token![unsafe](tokens_helper(f, &node.unsafe_token.span)),
+        block: f.fold_block(node.block),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_expr_while<F>(f: &mut F, node: ExprWhile) -> ExprWhile
+where
+    F: Fold + ?Sized,
+{
+    ExprWhile {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        label: (node.label).map(|it| f.fold_label(it)),
+        while_token: Token![while](tokens_helper(f, &node.while_token.span)),
+        cond: Box::new(f.fold_expr(*node.cond)),
+        body: f.fold_block(node.body),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_expr_yield<F>(f: &mut F, node: ExprYield) -> ExprYield
+where
+    F: Fold + ?Sized,
+{
+    ExprYield {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        yield_token: Token![yield](tokens_helper(f, &node.yield_token.span)),
+        expr: (node.expr).map(|it| Box::new(f.fold_expr(*it))),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_field<F>(f: &mut F, node: Field) -> Field
+where
+    F: Fold + ?Sized,
+{
+    Field {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        vis: f.fold_visibility(node.vis),
+        ident: (node.ident).map(|it| f.fold_ident(it)),
+        colon_token: (node.colon_token).map(|it| Token![:](tokens_helper(f, &it.spans))),
+        ty: f.fold_type(node.ty),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_field_pat<F>(f: &mut F, node: FieldPat) -> FieldPat
+where
+    F: Fold + ?Sized,
+{
+    FieldPat {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        member: f.fold_member(node.member),
+        colon_token: (node.colon_token).map(|it| Token![:](tokens_helper(f, &it.spans))),
+        pat: Box::new(f.fold_pat(*node.pat)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_field_value<F>(f: &mut F, node: FieldValue) -> FieldValue
+where
+    F: Fold + ?Sized,
+{
+    FieldValue {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        member: f.fold_member(node.member),
+        colon_token: (node.colon_token).map(|it| Token![:](tokens_helper(f, &it.spans))),
+        expr: f.fold_expr(node.expr),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_fields<F>(f: &mut F, node: Fields) -> Fields
+where
+    F: Fold + ?Sized,
+{
+    match node {
+        Fields::Named(_binding_0) => Fields::Named(f.fold_fields_named(_binding_0)),
+        Fields::Unnamed(_binding_0) => Fields::Unnamed(f.fold_fields_unnamed(_binding_0)),
+        Fields::Unit => Fields::Unit,
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_fields_named<F>(f: &mut F, node: FieldsNamed) -> FieldsNamed
+where
+    F: Fold + ?Sized,
+{
+    FieldsNamed {
+        brace_token: Brace(tokens_helper(f, &node.brace_token.span)),
+        named: FoldHelper::lift(node.named, |it| f.fold_field(it)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_fields_unnamed<F>(f: &mut F, node: FieldsUnnamed) -> FieldsUnnamed
+where
+    F: Fold + ?Sized,
+{
+    FieldsUnnamed {
+        paren_token: Paren(tokens_helper(f, &node.paren_token.span)),
+        unnamed: FoldHelper::lift(node.unnamed, |it| f.fold_field(it)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_file<F>(f: &mut F, node: File) -> File
+where
+    F: Fold + ?Sized,
+{
+    File {
+        shebang: node.shebang,
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        items: FoldHelper::lift(node.items, |it| f.fold_item(it)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_fn_arg<F>(f: &mut F, node: FnArg) -> FnArg
+where
+    F: Fold + ?Sized,
+{
+    match node {
+        FnArg::Receiver(_binding_0) => FnArg::Receiver(f.fold_receiver(_binding_0)),
+        FnArg::Typed(_binding_0) => FnArg::Typed(f.fold_pat_type(_binding_0)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_foreign_item<F>(f: &mut F, node: ForeignItem) -> ForeignItem
+where
+    F: Fold + ?Sized,
+{
+    match node {
+        ForeignItem::Fn(_binding_0) => {
+            ForeignItem::Fn(f.fold_foreign_item_fn(_binding_0))
+        }
+        ForeignItem::Static(_binding_0) => {
+            ForeignItem::Static(f.fold_foreign_item_static(_binding_0))
+        }
+        ForeignItem::Type(_binding_0) => {
+            ForeignItem::Type(f.fold_foreign_item_type(_binding_0))
+        }
+        ForeignItem::Macro(_binding_0) => {
+            ForeignItem::Macro(f.fold_foreign_item_macro(_binding_0))
+        }
+        ForeignItem::Verbatim(_binding_0) => ForeignItem::Verbatim(_binding_0),
+        #[cfg(syn_no_non_exhaustive)]
+        _ => unreachable!(),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_foreign_item_fn<F>(f: &mut F, node: ForeignItemFn) -> ForeignItemFn
+where
+    F: Fold + ?Sized,
+{
+    ForeignItemFn {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        vis: f.fold_visibility(node.vis),
+        sig: f.fold_signature(node.sig),
+        semi_token: Token![;](tokens_helper(f, &node.semi_token.spans)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_foreign_item_macro<F>(f: &mut F, node: ForeignItemMacro) -> ForeignItemMacro
+where
+    F: Fold + ?Sized,
+{
+    ForeignItemMacro {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        mac: f.fold_macro(node.mac),
+        semi_token: (node.semi_token).map(|it| Token![;](tokens_helper(f, &it.spans))),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_foreign_item_static<F>(
+    f: &mut F,
+    node: ForeignItemStatic,
+) -> ForeignItemStatic
+where
+    F: Fold + ?Sized,
+{
+    ForeignItemStatic {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        vis: f.fold_visibility(node.vis),
+        static_token: Token![static](tokens_helper(f, &node.static_token.span)),
+        mutability: (node.mutability).map(|it| Token![mut](tokens_helper(f, &it.span))),
+        ident: f.fold_ident(node.ident),
+        colon_token: Token![:](tokens_helper(f, &node.colon_token.spans)),
+        ty: Box::new(f.fold_type(*node.ty)),
+        semi_token: Token![;](tokens_helper(f, &node.semi_token.spans)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_foreign_item_type<F>(f: &mut F, node: ForeignItemType) -> ForeignItemType
+where
+    F: Fold + ?Sized,
+{
+    ForeignItemType {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        vis: f.fold_visibility(node.vis),
+        type_token: Token![type](tokens_helper(f, &node.type_token.span)),
+        ident: f.fold_ident(node.ident),
+        semi_token: Token![;](tokens_helper(f, &node.semi_token.spans)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_generic_argument<F>(f: &mut F, node: GenericArgument) -> GenericArgument
+where
+    F: Fold + ?Sized,
+{
+    match node {
+        GenericArgument::Lifetime(_binding_0) => {
+            GenericArgument::Lifetime(f.fold_lifetime(_binding_0))
+        }
+        GenericArgument::Type(_binding_0) => {
+            GenericArgument::Type(f.fold_type(_binding_0))
+        }
+        GenericArgument::Const(_binding_0) => {
+            GenericArgument::Const(f.fold_expr(_binding_0))
+        }
+        GenericArgument::Binding(_binding_0) => {
+            GenericArgument::Binding(f.fold_binding(_binding_0))
+        }
+        GenericArgument::Constraint(_binding_0) => {
+            GenericArgument::Constraint(f.fold_constraint(_binding_0))
+        }
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_generic_method_argument<F>(
+    f: &mut F,
+    node: GenericMethodArgument,
+) -> GenericMethodArgument
+where
+    F: Fold + ?Sized,
+{
+    match node {
+        GenericMethodArgument::Type(_binding_0) => {
+            GenericMethodArgument::Type(f.fold_type(_binding_0))
+        }
+        GenericMethodArgument::Const(_binding_0) => {
+            GenericMethodArgument::Const(f.fold_expr(_binding_0))
+        }
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_generic_param<F>(f: &mut F, node: GenericParam) -> GenericParam
+where
+    F: Fold + ?Sized,
+{
+    match node {
+        GenericParam::Type(_binding_0) => {
+            GenericParam::Type(f.fold_type_param(_binding_0))
+        }
+        GenericParam::Lifetime(_binding_0) => {
+            GenericParam::Lifetime(f.fold_lifetime_def(_binding_0))
+        }
+        GenericParam::Const(_binding_0) => {
+            GenericParam::Const(f.fold_const_param(_binding_0))
+        }
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_generics<F>(f: &mut F, node: Generics) -> Generics
+where
+    F: Fold + ?Sized,
+{
+    Generics {
+        lt_token: (node.lt_token).map(|it| Token![<](tokens_helper(f, &it.spans))),
+        params: FoldHelper::lift(node.params, |it| f.fold_generic_param(it)),
+        gt_token: (node.gt_token).map(|it| Token![>](tokens_helper(f, &it.spans))),
+        where_clause: (node.where_clause).map(|it| f.fold_where_clause(it)),
+    }
+}
+pub fn fold_ident<F>(f: &mut F, node: Ident) -> Ident
+where
+    F: Fold + ?Sized,
+{
+    let mut node = node;
+    let span = f.fold_span(node.span());
+    node.set_span(span);
+    node
+}
+#[cfg(feature = "full")]
+pub fn fold_impl_item<F>(f: &mut F, node: ImplItem) -> ImplItem
+where
+    F: Fold + ?Sized,
+{
+    match node {
+        ImplItem::Const(_binding_0) => {
+            ImplItem::Const(f.fold_impl_item_const(_binding_0))
+        }
+        ImplItem::Method(_binding_0) => {
+            ImplItem::Method(f.fold_impl_item_method(_binding_0))
+        }
+        ImplItem::Type(_binding_0) => ImplItem::Type(f.fold_impl_item_type(_binding_0)),
+        ImplItem::Macro(_binding_0) => {
+            ImplItem::Macro(f.fold_impl_item_macro(_binding_0))
+        }
+        ImplItem::Verbatim(_binding_0) => ImplItem::Verbatim(_binding_0),
+        #[cfg(syn_no_non_exhaustive)]
+        _ => unreachable!(),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_impl_item_const<F>(f: &mut F, node: ImplItemConst) -> ImplItemConst
+where
+    F: Fold + ?Sized,
+{
+    ImplItemConst {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        vis: f.fold_visibility(node.vis),
+        defaultness: (node.defaultness)
+            .map(|it| Token![default](tokens_helper(f, &it.span))),
+        const_token: Token![const](tokens_helper(f, &node.const_token.span)),
+        ident: f.fold_ident(node.ident),
+        colon_token: Token![:](tokens_helper(f, &node.colon_token.spans)),
+        ty: f.fold_type(node.ty),
+        eq_token: Token![=](tokens_helper(f, &node.eq_token.spans)),
+        expr: f.fold_expr(node.expr),
+        semi_token: Token![;](tokens_helper(f, &node.semi_token.spans)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_impl_item_macro<F>(f: &mut F, node: ImplItemMacro) -> ImplItemMacro
+where
+    F: Fold + ?Sized,
+{
+    ImplItemMacro {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        mac: f.fold_macro(node.mac),
+        semi_token: (node.semi_token).map(|it| Token![;](tokens_helper(f, &it.spans))),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_impl_item_method<F>(f: &mut F, node: ImplItemMethod) -> ImplItemMethod
+where
+    F: Fold + ?Sized,
+{
+    ImplItemMethod {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        vis: f.fold_visibility(node.vis),
+        defaultness: (node.defaultness)
+            .map(|it| Token![default](tokens_helper(f, &it.span))),
+        sig: f.fold_signature(node.sig),
+        block: f.fold_block(node.block),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_impl_item_type<F>(f: &mut F, node: ImplItemType) -> ImplItemType
+where
+    F: Fold + ?Sized,
+{
+    ImplItemType {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        vis: f.fold_visibility(node.vis),
+        defaultness: (node.defaultness)
+            .map(|it| Token![default](tokens_helper(f, &it.span))),
+        type_token: Token![type](tokens_helper(f, &node.type_token.span)),
+        ident: f.fold_ident(node.ident),
+        generics: f.fold_generics(node.generics),
+        eq_token: Token![=](tokens_helper(f, &node.eq_token.spans)),
+        ty: f.fold_type(node.ty),
+        semi_token: Token![;](tokens_helper(f, &node.semi_token.spans)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_index<F>(f: &mut F, node: Index) -> Index
+where
+    F: Fold + ?Sized,
+{
+    Index {
+        index: node.index,
+        span: f.fold_span(node.span),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_item<F>(f: &mut F, node: Item) -> Item
+where
+    F: Fold + ?Sized,
+{
+    match node {
+        Item::Const(_binding_0) => Item::Const(f.fold_item_const(_binding_0)),
+        Item::Enum(_binding_0) => Item::Enum(f.fold_item_enum(_binding_0)),
+        Item::ExternCrate(_binding_0) => {
+            Item::ExternCrate(f.fold_item_extern_crate(_binding_0))
+        }
+        Item::Fn(_binding_0) => Item::Fn(f.fold_item_fn(_binding_0)),
+        Item::ForeignMod(_binding_0) => {
+            Item::ForeignMod(f.fold_item_foreign_mod(_binding_0))
+        }
+        Item::Impl(_binding_0) => Item::Impl(f.fold_item_impl(_binding_0)),
+        Item::Macro(_binding_0) => Item::Macro(f.fold_item_macro(_binding_0)),
+        Item::Macro2(_binding_0) => Item::Macro2(f.fold_item_macro2(_binding_0)),
+        Item::Mod(_binding_0) => Item::Mod(f.fold_item_mod(_binding_0)),
+        Item::Static(_binding_0) => Item::Static(f.fold_item_static(_binding_0)),
+        Item::Struct(_binding_0) => Item::Struct(f.fold_item_struct(_binding_0)),
+        Item::Trait(_binding_0) => Item::Trait(f.fold_item_trait(_binding_0)),
+        Item::TraitAlias(_binding_0) => {
+            Item::TraitAlias(f.fold_item_trait_alias(_binding_0))
+        }
+        Item::Type(_binding_0) => Item::Type(f.fold_item_type(_binding_0)),
+        Item::Union(_binding_0) => Item::Union(f.fold_item_union(_binding_0)),
+        Item::Use(_binding_0) => Item::Use(f.fold_item_use(_binding_0)),
+        Item::Verbatim(_binding_0) => Item::Verbatim(_binding_0),
+        #[cfg(syn_no_non_exhaustive)]
+        _ => unreachable!(),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_item_const<F>(f: &mut F, node: ItemConst) -> ItemConst
+where
+    F: Fold + ?Sized,
+{
+    ItemConst {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        vis: f.fold_visibility(node.vis),
+        const_token: Token![const](tokens_helper(f, &node.const_token.span)),
+        ident: f.fold_ident(node.ident),
+        colon_token: Token![:](tokens_helper(f, &node.colon_token.spans)),
+        ty: Box::new(f.fold_type(*node.ty)),
+        eq_token: Token![=](tokens_helper(f, &node.eq_token.spans)),
+        expr: Box::new(f.fold_expr(*node.expr)),
+        semi_token: Token![;](tokens_helper(f, &node.semi_token.spans)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_item_enum<F>(f: &mut F, node: ItemEnum) -> ItemEnum
+where
+    F: Fold + ?Sized,
+{
+    ItemEnum {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        vis: f.fold_visibility(node.vis),
+        enum_token: Token![enum](tokens_helper(f, &node.enum_token.span)),
+        ident: f.fold_ident(node.ident),
+        generics: f.fold_generics(node.generics),
+        brace_token: Brace(tokens_helper(f, &node.brace_token.span)),
+        variants: FoldHelper::lift(node.variants, |it| f.fold_variant(it)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_item_extern_crate<F>(f: &mut F, node: ItemExternCrate) -> ItemExternCrate
+where
+    F: Fold + ?Sized,
+{
+    ItemExternCrate {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        vis: f.fold_visibility(node.vis),
+        extern_token: Token![extern](tokens_helper(f, &node.extern_token.span)),
+        crate_token: Token![crate](tokens_helper(f, &node.crate_token.span)),
+        ident: f.fold_ident(node.ident),
+        rename: (node.rename)
+            .map(|it| (
+                Token![as](tokens_helper(f, &(it).0.span)),
+                f.fold_ident((it).1),
+            )),
+        semi_token: Token![;](tokens_helper(f, &node.semi_token.spans)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_item_fn<F>(f: &mut F, node: ItemFn) -> ItemFn
+where
+    F: Fold + ?Sized,
+{
+    ItemFn {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        vis: f.fold_visibility(node.vis),
+        sig: f.fold_signature(node.sig),
+        block: Box::new(f.fold_block(*node.block)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_item_foreign_mod<F>(f: &mut F, node: ItemForeignMod) -> ItemForeignMod
+where
+    F: Fold + ?Sized,
+{
+    ItemForeignMod {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        abi: f.fold_abi(node.abi),
+        brace_token: Brace(tokens_helper(f, &node.brace_token.span)),
+        items: FoldHelper::lift(node.items, |it| f.fold_foreign_item(it)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_item_impl<F>(f: &mut F, node: ItemImpl) -> ItemImpl
+where
+    F: Fold + ?Sized,
+{
+    ItemImpl {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        defaultness: (node.defaultness)
+            .map(|it| Token![default](tokens_helper(f, &it.span))),
+        unsafety: (node.unsafety).map(|it| Token![unsafe](tokens_helper(f, &it.span))),
+        impl_token: Token![impl](tokens_helper(f, &node.impl_token.span)),
+        generics: f.fold_generics(node.generics),
+        trait_: (node.trait_)
+            .map(|it| (
+                ((it).0).map(|it| Token![!](tokens_helper(f, &it.spans))),
+                f.fold_path((it).1),
+                Token![for](tokens_helper(f, &(it).2.span)),
+            )),
+        self_ty: Box::new(f.fold_type(*node.self_ty)),
+        brace_token: Brace(tokens_helper(f, &node.brace_token.span)),
+        items: FoldHelper::lift(node.items, |it| f.fold_impl_item(it)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_item_macro<F>(f: &mut F, node: ItemMacro) -> ItemMacro
+where
+    F: Fold + ?Sized,
+{
+    ItemMacro {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        ident: (node.ident).map(|it| f.fold_ident(it)),
+        mac: f.fold_macro(node.mac),
+        semi_token: (node.semi_token).map(|it| Token![;](tokens_helper(f, &it.spans))),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_item_macro2<F>(f: &mut F, node: ItemMacro2) -> ItemMacro2
+where
+    F: Fold + ?Sized,
+{
+    ItemMacro2 {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        vis: f.fold_visibility(node.vis),
+        macro_token: Token![macro](tokens_helper(f, &node.macro_token.span)),
+        ident: f.fold_ident(node.ident),
+        rules: node.rules,
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_item_mod<F>(f: &mut F, node: ItemMod) -> ItemMod
+where
+    F: Fold + ?Sized,
+{
+    ItemMod {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        vis: f.fold_visibility(node.vis),
+        mod_token: Token![mod](tokens_helper(f, &node.mod_token.span)),
+        ident: f.fold_ident(node.ident),
+        content: (node.content)
+            .map(|it| (
+                Brace(tokens_helper(f, &(it).0.span)),
+                FoldHelper::lift((it).1, |it| f.fold_item(it)),
+            )),
+        semi: (node.semi).map(|it| Token![;](tokens_helper(f, &it.spans))),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_item_static<F>(f: &mut F, node: ItemStatic) -> ItemStatic
+where
+    F: Fold + ?Sized,
+{
+    ItemStatic {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        vis: f.fold_visibility(node.vis),
+        static_token: Token![static](tokens_helper(f, &node.static_token.span)),
+        mutability: (node.mutability).map(|it| Token![mut](tokens_helper(f, &it.span))),
+        ident: f.fold_ident(node.ident),
+        colon_token: Token![:](tokens_helper(f, &node.colon_token.spans)),
+        ty: Box::new(f.fold_type(*node.ty)),
+        eq_token: Token![=](tokens_helper(f, &node.eq_token.spans)),
+        expr: Box::new(f.fold_expr(*node.expr)),
+        semi_token: Token![;](tokens_helper(f, &node.semi_token.spans)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_item_struct<F>(f: &mut F, node: ItemStruct) -> ItemStruct
+where
+    F: Fold + ?Sized,
+{
+    ItemStruct {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        vis: f.fold_visibility(node.vis),
+        struct_token: Token![struct](tokens_helper(f, &node.struct_token.span)),
+        ident: f.fold_ident(node.ident),
+        generics: f.fold_generics(node.generics),
+        fields: f.fold_fields(node.fields),
+        semi_token: (node.semi_token).map(|it| Token![;](tokens_helper(f, &it.spans))),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_item_trait<F>(f: &mut F, node: ItemTrait) -> ItemTrait
+where
+    F: Fold + ?Sized,
+{
+    ItemTrait {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        vis: f.fold_visibility(node.vis),
+        unsafety: (node.unsafety).map(|it| Token![unsafe](tokens_helper(f, &it.span))),
+        auto_token: (node.auto_token).map(|it| Token![auto](tokens_helper(f, &it.span))),
+        trait_token: Token![trait](tokens_helper(f, &node.trait_token.span)),
+        ident: f.fold_ident(node.ident),
+        generics: f.fold_generics(node.generics),
+        colon_token: (node.colon_token).map(|it| Token![:](tokens_helper(f, &it.spans))),
+        supertraits: FoldHelper::lift(
+            node.supertraits,
+            |it| f.fold_type_param_bound(it),
+        ),
+        brace_token: Brace(tokens_helper(f, &node.brace_token.span)),
+        items: FoldHelper::lift(node.items, |it| f.fold_trait_item(it)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_item_trait_alias<F>(f: &mut F, node: ItemTraitAlias) -> ItemTraitAlias
+where
+    F: Fold + ?Sized,
+{
+    ItemTraitAlias {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        vis: f.fold_visibility(node.vis),
+        trait_token: Token![trait](tokens_helper(f, &node.trait_token.span)),
+        ident: f.fold_ident(node.ident),
+        generics: f.fold_generics(node.generics),
+        eq_token: Token![=](tokens_helper(f, &node.eq_token.spans)),
+        bounds: FoldHelper::lift(node.bounds, |it| f.fold_type_param_bound(it)),
+        semi_token: Token![;](tokens_helper(f, &node.semi_token.spans)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_item_type<F>(f: &mut F, node: ItemType) -> ItemType
+where
+    F: Fold + ?Sized,
+{
+    ItemType {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        vis: f.fold_visibility(node.vis),
+        type_token: Token![type](tokens_helper(f, &node.type_token.span)),
+        ident: f.fold_ident(node.ident),
+        generics: f.fold_generics(node.generics),
+        eq_token: Token![=](tokens_helper(f, &node.eq_token.spans)),
+        ty: Box::new(f.fold_type(*node.ty)),
+        semi_token: Token![;](tokens_helper(f, &node.semi_token.spans)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_item_union<F>(f: &mut F, node: ItemUnion) -> ItemUnion
+where
+    F: Fold + ?Sized,
+{
+    ItemUnion {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        vis: f.fold_visibility(node.vis),
+        union_token: Token![union](tokens_helper(f, &node.union_token.span)),
+        ident: f.fold_ident(node.ident),
+        generics: f.fold_generics(node.generics),
+        fields: f.fold_fields_named(node.fields),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_item_use<F>(f: &mut F, node: ItemUse) -> ItemUse
+where
+    F: Fold + ?Sized,
+{
+    ItemUse {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        vis: f.fold_visibility(node.vis),
+        use_token: Token![use](tokens_helper(f, &node.use_token.span)),
+        leading_colon: (node.leading_colon)
+            .map(|it| Token![::](tokens_helper(f, &it.spans))),
+        tree: f.fold_use_tree(node.tree),
+        semi_token: Token![;](tokens_helper(f, &node.semi_token.spans)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_label<F>(f: &mut F, node: Label) -> Label
+where
+    F: Fold + ?Sized,
+{
+    Label {
+        name: f.fold_lifetime(node.name),
+        colon_token: Token![:](tokens_helper(f, &node.colon_token.spans)),
+    }
+}
+pub fn fold_lifetime<F>(f: &mut F, node: Lifetime) -> Lifetime
+where
+    F: Fold + ?Sized,
+{
+    Lifetime {
+        apostrophe: f.fold_span(node.apostrophe),
+        ident: f.fold_ident(node.ident),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_lifetime_def<F>(f: &mut F, node: LifetimeDef) -> LifetimeDef
+where
+    F: Fold + ?Sized,
+{
+    LifetimeDef {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        lifetime: f.fold_lifetime(node.lifetime),
+        colon_token: (node.colon_token).map(|it| Token![:](tokens_helper(f, &it.spans))),
+        bounds: FoldHelper::lift(node.bounds, |it| f.fold_lifetime(it)),
+    }
+}
+pub fn fold_lit<F>(f: &mut F, node: Lit) -> Lit
+where
+    F: Fold + ?Sized,
+{
+    match node {
+        Lit::Str(_binding_0) => Lit::Str(f.fold_lit_str(_binding_0)),
+        Lit::ByteStr(_binding_0) => Lit::ByteStr(f.fold_lit_byte_str(_binding_0)),
+        Lit::Byte(_binding_0) => Lit::Byte(f.fold_lit_byte(_binding_0)),
+        Lit::Char(_binding_0) => Lit::Char(f.fold_lit_char(_binding_0)),
+        Lit::Int(_binding_0) => Lit::Int(f.fold_lit_int(_binding_0)),
+        Lit::Float(_binding_0) => Lit::Float(f.fold_lit_float(_binding_0)),
+        Lit::Bool(_binding_0) => Lit::Bool(f.fold_lit_bool(_binding_0)),
+        Lit::Verbatim(_binding_0) => Lit::Verbatim(_binding_0),
+    }
+}
+pub fn fold_lit_bool<F>(f: &mut F, node: LitBool) -> LitBool
+where
+    F: Fold + ?Sized,
+{
+    LitBool {
+        value: node.value,
+        span: f.fold_span(node.span),
+    }
+}
+pub fn fold_lit_byte<F>(f: &mut F, node: LitByte) -> LitByte
+where
+    F: Fold + ?Sized,
+{
+    let span = f.fold_span(node.span());
+    let mut node = node;
+    node.set_span(span);
+    node
+}
+pub fn fold_lit_byte_str<F>(f: &mut F, node: LitByteStr) -> LitByteStr
+where
+    F: Fold + ?Sized,
+{
+    let span = f.fold_span(node.span());
+    let mut node = node;
+    node.set_span(span);
+    node
+}
+pub fn fold_lit_char<F>(f: &mut F, node: LitChar) -> LitChar
+where
+    F: Fold + ?Sized,
+{
+    let span = f.fold_span(node.span());
+    let mut node = node;
+    node.set_span(span);
+    node
+}
+pub fn fold_lit_float<F>(f: &mut F, node: LitFloat) -> LitFloat
+where
+    F: Fold + ?Sized,
+{
+    let span = f.fold_span(node.span());
+    let mut node = node;
+    node.set_span(span);
+    node
+}
+pub fn fold_lit_int<F>(f: &mut F, node: LitInt) -> LitInt
+where
+    F: Fold + ?Sized,
+{
+    let span = f.fold_span(node.span());
+    let mut node = node;
+    node.set_span(span);
+    node
+}
+pub fn fold_lit_str<F>(f: &mut F, node: LitStr) -> LitStr
+where
+    F: Fold + ?Sized,
+{
+    let span = f.fold_span(node.span());
+    let mut node = node;
+    node.set_span(span);
+    node
+}
+#[cfg(feature = "full")]
+pub fn fold_local<F>(f: &mut F, node: Local) -> Local
+where
+    F: Fold + ?Sized,
+{
+    Local {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        let_token: Token![let](tokens_helper(f, &node.let_token.span)),
+        pat: f.fold_pat(node.pat),
+        init: (node.init)
+            .map(|it| (
+                Token![=](tokens_helper(f, &(it).0.spans)),
+                Box::new(f.fold_expr(*(it).1)),
+            )),
+        semi_token: Token![;](tokens_helper(f, &node.semi_token.spans)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_macro<F>(f: &mut F, node: Macro) -> Macro
+where
+    F: Fold + ?Sized,
+{
+    Macro {
+        path: f.fold_path(node.path),
+        bang_token: Token![!](tokens_helper(f, &node.bang_token.spans)),
+        delimiter: f.fold_macro_delimiter(node.delimiter),
+        tokens: node.tokens,
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_macro_delimiter<F>(f: &mut F, node: MacroDelimiter) -> MacroDelimiter
+where
+    F: Fold + ?Sized,
+{
+    match node {
+        MacroDelimiter::Paren(_binding_0) => {
+            MacroDelimiter::Paren(Paren(tokens_helper(f, &_binding_0.span)))
+        }
+        MacroDelimiter::Brace(_binding_0) => {
+            MacroDelimiter::Brace(Brace(tokens_helper(f, &_binding_0.span)))
+        }
+        MacroDelimiter::Bracket(_binding_0) => {
+            MacroDelimiter::Bracket(Bracket(tokens_helper(f, &_binding_0.span)))
+        }
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_member<F>(f: &mut F, node: Member) -> Member
+where
+    F: Fold + ?Sized,
+{
+    match node {
+        Member::Named(_binding_0) => Member::Named(f.fold_ident(_binding_0)),
+        Member::Unnamed(_binding_0) => Member::Unnamed(f.fold_index(_binding_0)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_meta<F>(f: &mut F, node: Meta) -> Meta
+where
+    F: Fold + ?Sized,
+{
+    match node {
+        Meta::Path(_binding_0) => Meta::Path(f.fold_path(_binding_0)),
+        Meta::List(_binding_0) => Meta::List(f.fold_meta_list(_binding_0)),
+        Meta::NameValue(_binding_0) => {
+            Meta::NameValue(f.fold_meta_name_value(_binding_0))
+        }
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_meta_list<F>(f: &mut F, node: MetaList) -> MetaList
+where
+    F: Fold + ?Sized,
+{
+    MetaList {
+        path: f.fold_path(node.path),
+        paren_token: Paren(tokens_helper(f, &node.paren_token.span)),
+        nested: FoldHelper::lift(node.nested, |it| f.fold_nested_meta(it)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_meta_name_value<F>(f: &mut F, node: MetaNameValue) -> MetaNameValue
+where
+    F: Fold + ?Sized,
+{
+    MetaNameValue {
+        path: f.fold_path(node.path),
+        eq_token: Token![=](tokens_helper(f, &node.eq_token.spans)),
+        lit: f.fold_lit(node.lit),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_method_turbofish<F>(f: &mut F, node: MethodTurbofish) -> MethodTurbofish
+where
+    F: Fold + ?Sized,
+{
+    MethodTurbofish {
+        colon2_token: Token![::](tokens_helper(f, &node.colon2_token.spans)),
+        lt_token: Token![<](tokens_helper(f, &node.lt_token.spans)),
+        args: FoldHelper::lift(node.args, |it| f.fold_generic_method_argument(it)),
+        gt_token: Token![>](tokens_helper(f, &node.gt_token.spans)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_nested_meta<F>(f: &mut F, node: NestedMeta) -> NestedMeta
+where
+    F: Fold + ?Sized,
+{
+    match node {
+        NestedMeta::Meta(_binding_0) => NestedMeta::Meta(f.fold_meta(_binding_0)),
+        NestedMeta::Lit(_binding_0) => NestedMeta::Lit(f.fold_lit(_binding_0)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_parenthesized_generic_arguments<F>(
+    f: &mut F,
+    node: ParenthesizedGenericArguments,
+) -> ParenthesizedGenericArguments
+where
+    F: Fold + ?Sized,
+{
+    ParenthesizedGenericArguments {
+        paren_token: Paren(tokens_helper(f, &node.paren_token.span)),
+        inputs: FoldHelper::lift(node.inputs, |it| f.fold_type(it)),
+        output: f.fold_return_type(node.output),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_pat<F>(f: &mut F, node: Pat) -> Pat
+where
+    F: Fold + ?Sized,
+{
+    match node {
+        Pat::Box(_binding_0) => Pat::Box(f.fold_pat_box(_binding_0)),
+        Pat::Ident(_binding_0) => Pat::Ident(f.fold_pat_ident(_binding_0)),
+        Pat::Lit(_binding_0) => Pat::Lit(f.fold_pat_lit(_binding_0)),
+        Pat::Macro(_binding_0) => Pat::Macro(f.fold_pat_macro(_binding_0)),
+        Pat::Or(_binding_0) => Pat::Or(f.fold_pat_or(_binding_0)),
+        Pat::Path(_binding_0) => Pat::Path(f.fold_pat_path(_binding_0)),
+        Pat::Range(_binding_0) => Pat::Range(f.fold_pat_range(_binding_0)),
+        Pat::Reference(_binding_0) => Pat::Reference(f.fold_pat_reference(_binding_0)),
+        Pat::Rest(_binding_0) => Pat::Rest(f.fold_pat_rest(_binding_0)),
+        Pat::Slice(_binding_0) => Pat::Slice(f.fold_pat_slice(_binding_0)),
+        Pat::Struct(_binding_0) => Pat::Struct(f.fold_pat_struct(_binding_0)),
+        Pat::Tuple(_binding_0) => Pat::Tuple(f.fold_pat_tuple(_binding_0)),
+        Pat::TupleStruct(_binding_0) => {
+            Pat::TupleStruct(f.fold_pat_tuple_struct(_binding_0))
+        }
+        Pat::Type(_binding_0) => Pat::Type(f.fold_pat_type(_binding_0)),
+        Pat::Verbatim(_binding_0) => Pat::Verbatim(_binding_0),
+        Pat::Wild(_binding_0) => Pat::Wild(f.fold_pat_wild(_binding_0)),
+        #[cfg(syn_no_non_exhaustive)]
+        _ => unreachable!(),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_pat_box<F>(f: &mut F, node: PatBox) -> PatBox
+where
+    F: Fold + ?Sized,
+{
+    PatBox {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        box_token: Token![box](tokens_helper(f, &node.box_token.span)),
+        pat: Box::new(f.fold_pat(*node.pat)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_pat_ident<F>(f: &mut F, node: PatIdent) -> PatIdent
+where
+    F: Fold + ?Sized,
+{
+    PatIdent {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        by_ref: (node.by_ref).map(|it| Token![ref](tokens_helper(f, &it.span))),
+        mutability: (node.mutability).map(|it| Token![mut](tokens_helper(f, &it.span))),
+        ident: f.fold_ident(node.ident),
+        subpat: (node.subpat)
+            .map(|it| (
+                Token![@](tokens_helper(f, &(it).0.spans)),
+                Box::new(f.fold_pat(*(it).1)),
+            )),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_pat_lit<F>(f: &mut F, node: PatLit) -> PatLit
+where
+    F: Fold + ?Sized,
+{
+    PatLit {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        expr: Box::new(f.fold_expr(*node.expr)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_pat_macro<F>(f: &mut F, node: PatMacro) -> PatMacro
+where
+    F: Fold + ?Sized,
+{
+    PatMacro {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        mac: f.fold_macro(node.mac),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_pat_or<F>(f: &mut F, node: PatOr) -> PatOr
+where
+    F: Fold + ?Sized,
+{
+    PatOr {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        leading_vert: (node.leading_vert)
+            .map(|it| Token![|](tokens_helper(f, &it.spans))),
+        cases: FoldHelper::lift(node.cases, |it| f.fold_pat(it)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_pat_path<F>(f: &mut F, node: PatPath) -> PatPath
+where
+    F: Fold + ?Sized,
+{
+    PatPath {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        qself: (node.qself).map(|it| f.fold_qself(it)),
+        path: f.fold_path(node.path),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_pat_range<F>(f: &mut F, node: PatRange) -> PatRange
+where
+    F: Fold + ?Sized,
+{
+    PatRange {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        lo: Box::new(f.fold_expr(*node.lo)),
+        limits: f.fold_range_limits(node.limits),
+        hi: Box::new(f.fold_expr(*node.hi)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_pat_reference<F>(f: &mut F, node: PatReference) -> PatReference
+where
+    F: Fold + ?Sized,
+{
+    PatReference {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        and_token: Token![&](tokens_helper(f, &node.and_token.spans)),
+        mutability: (node.mutability).map(|it| Token![mut](tokens_helper(f, &it.span))),
+        pat: Box::new(f.fold_pat(*node.pat)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_pat_rest<F>(f: &mut F, node: PatRest) -> PatRest
+where
+    F: Fold + ?Sized,
+{
+    PatRest {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        dot2_token: Token![..](tokens_helper(f, &node.dot2_token.spans)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_pat_slice<F>(f: &mut F, node: PatSlice) -> PatSlice
+where
+    F: Fold + ?Sized,
+{
+    PatSlice {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        bracket_token: Bracket(tokens_helper(f, &node.bracket_token.span)),
+        elems: FoldHelper::lift(node.elems, |it| f.fold_pat(it)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_pat_struct<F>(f: &mut F, node: PatStruct) -> PatStruct
+where
+    F: Fold + ?Sized,
+{
+    PatStruct {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        path: f.fold_path(node.path),
+        brace_token: Brace(tokens_helper(f, &node.brace_token.span)),
+        fields: FoldHelper::lift(node.fields, |it| f.fold_field_pat(it)),
+        dot2_token: (node.dot2_token).map(|it| Token![..](tokens_helper(f, &it.spans))),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_pat_tuple<F>(f: &mut F, node: PatTuple) -> PatTuple
+where
+    F: Fold + ?Sized,
+{
+    PatTuple {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        paren_token: Paren(tokens_helper(f, &node.paren_token.span)),
+        elems: FoldHelper::lift(node.elems, |it| f.fold_pat(it)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_pat_tuple_struct<F>(f: &mut F, node: PatTupleStruct) -> PatTupleStruct
+where
+    F: Fold + ?Sized,
+{
+    PatTupleStruct {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        path: f.fold_path(node.path),
+        pat: f.fold_pat_tuple(node.pat),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_pat_type<F>(f: &mut F, node: PatType) -> PatType
+where
+    F: Fold + ?Sized,
+{
+    PatType {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        pat: Box::new(f.fold_pat(*node.pat)),
+        colon_token: Token![:](tokens_helper(f, &node.colon_token.spans)),
+        ty: Box::new(f.fold_type(*node.ty)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_pat_wild<F>(f: &mut F, node: PatWild) -> PatWild
+where
+    F: Fold + ?Sized,
+{
+    PatWild {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        underscore_token: Token![_](tokens_helper(f, &node.underscore_token.spans)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_path<F>(f: &mut F, node: Path) -> Path
+where
+    F: Fold + ?Sized,
+{
+    Path {
+        leading_colon: (node.leading_colon)
+            .map(|it| Token![::](tokens_helper(f, &it.spans))),
+        segments: FoldHelper::lift(node.segments, |it| f.fold_path_segment(it)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_path_arguments<F>(f: &mut F, node: PathArguments) -> PathArguments
+where
+    F: Fold + ?Sized,
+{
+    match node {
+        PathArguments::None => PathArguments::None,
+        PathArguments::AngleBracketed(_binding_0) => {
+            PathArguments::AngleBracketed(
+                f.fold_angle_bracketed_generic_arguments(_binding_0),
+            )
+        }
+        PathArguments::Parenthesized(_binding_0) => {
+            PathArguments::Parenthesized(
+                f.fold_parenthesized_generic_arguments(_binding_0),
+            )
+        }
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_path_segment<F>(f: &mut F, node: PathSegment) -> PathSegment
+where
+    F: Fold + ?Sized,
+{
+    PathSegment {
+        ident: f.fold_ident(node.ident),
+        arguments: f.fold_path_arguments(node.arguments),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_predicate_eq<F>(f: &mut F, node: PredicateEq) -> PredicateEq
+where
+    F: Fold + ?Sized,
+{
+    PredicateEq {
+        lhs_ty: f.fold_type(node.lhs_ty),
+        eq_token: Token![=](tokens_helper(f, &node.eq_token.spans)),
+        rhs_ty: f.fold_type(node.rhs_ty),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_predicate_lifetime<F>(
+    f: &mut F,
+    node: PredicateLifetime,
+) -> PredicateLifetime
+where
+    F: Fold + ?Sized,
+{
+    PredicateLifetime {
+        lifetime: f.fold_lifetime(node.lifetime),
+        colon_token: Token![:](tokens_helper(f, &node.colon_token.spans)),
+        bounds: FoldHelper::lift(node.bounds, |it| f.fold_lifetime(it)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_predicate_type<F>(f: &mut F, node: PredicateType) -> PredicateType
+where
+    F: Fold + ?Sized,
+{
+    PredicateType {
+        lifetimes: (node.lifetimes).map(|it| f.fold_bound_lifetimes(it)),
+        bounded_ty: f.fold_type(node.bounded_ty),
+        colon_token: Token![:](tokens_helper(f, &node.colon_token.spans)),
+        bounds: FoldHelper::lift(node.bounds, |it| f.fold_type_param_bound(it)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_qself<F>(f: &mut F, node: QSelf) -> QSelf
+where
+    F: Fold + ?Sized,
+{
+    QSelf {
+        lt_token: Token![<](tokens_helper(f, &node.lt_token.spans)),
+        ty: Box::new(f.fold_type(*node.ty)),
+        position: node.position,
+        as_token: (node.as_token).map(|it| Token![as](tokens_helper(f, &it.span))),
+        gt_token: Token![>](tokens_helper(f, &node.gt_token.spans)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_range_limits<F>(f: &mut F, node: RangeLimits) -> RangeLimits
+where
+    F: Fold + ?Sized,
+{
+    match node {
+        RangeLimits::HalfOpen(_binding_0) => {
+            RangeLimits::HalfOpen(Token![..](tokens_helper(f, &_binding_0.spans)))
+        }
+        RangeLimits::Closed(_binding_0) => {
+            RangeLimits::Closed(Token![..=](tokens_helper(f, &_binding_0.spans)))
+        }
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_receiver<F>(f: &mut F, node: Receiver) -> Receiver
+where
+    F: Fold + ?Sized,
+{
+    Receiver {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        reference: (node.reference)
+            .map(|it| (
+                Token![&](tokens_helper(f, &(it).0.spans)),
+                ((it).1).map(|it| f.fold_lifetime(it)),
+            )),
+        mutability: (node.mutability).map(|it| Token![mut](tokens_helper(f, &it.span))),
+        self_token: Token![self](tokens_helper(f, &node.self_token.span)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_return_type<F>(f: &mut F, node: ReturnType) -> ReturnType
+where
+    F: Fold + ?Sized,
+{
+    match node {
+        ReturnType::Default => ReturnType::Default,
+        ReturnType::Type(_binding_0, _binding_1) => {
+            ReturnType::Type(
+                Token![->](tokens_helper(f, &_binding_0.spans)),
+                Box::new(f.fold_type(*_binding_1)),
+            )
+        }
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_signature<F>(f: &mut F, node: Signature) -> Signature
+where
+    F: Fold + ?Sized,
+{
+    Signature {
+        constness: (node.constness).map(|it| Token![const](tokens_helper(f, &it.span))),
+        asyncness: (node.asyncness).map(|it| Token![async](tokens_helper(f, &it.span))),
+        unsafety: (node.unsafety).map(|it| Token![unsafe](tokens_helper(f, &it.span))),
+        abi: (node.abi).map(|it| f.fold_abi(it)),
+        fn_token: Token![fn](tokens_helper(f, &node.fn_token.span)),
+        ident: f.fold_ident(node.ident),
+        generics: f.fold_generics(node.generics),
+        paren_token: Paren(tokens_helper(f, &node.paren_token.span)),
+        inputs: FoldHelper::lift(node.inputs, |it| f.fold_fn_arg(it)),
+        variadic: (node.variadic).map(|it| f.fold_variadic(it)),
+        output: f.fold_return_type(node.output),
+    }
+}
+pub fn fold_span<F>(f: &mut F, node: Span) -> Span
+where
+    F: Fold + ?Sized,
+{
+    node
+}
+#[cfg(feature = "full")]
+pub fn fold_stmt<F>(f: &mut F, node: Stmt) -> Stmt
+where
+    F: Fold + ?Sized,
+{
+    match node {
+        Stmt::Local(_binding_0) => Stmt::Local(f.fold_local(_binding_0)),
+        Stmt::Item(_binding_0) => Stmt::Item(f.fold_item(_binding_0)),
+        Stmt::Expr(_binding_0) => Stmt::Expr(f.fold_expr(_binding_0)),
+        Stmt::Semi(_binding_0, _binding_1) => {
+            Stmt::Semi(
+                f.fold_expr(_binding_0),
+                Token![;](tokens_helper(f, &_binding_1.spans)),
+            )
+        }
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_trait_bound<F>(f: &mut F, node: TraitBound) -> TraitBound
+where
+    F: Fold + ?Sized,
+{
+    TraitBound {
+        paren_token: (node.paren_token).map(|it| Paren(tokens_helper(f, &it.span))),
+        modifier: f.fold_trait_bound_modifier(node.modifier),
+        lifetimes: (node.lifetimes).map(|it| f.fold_bound_lifetimes(it)),
+        path: f.fold_path(node.path),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_trait_bound_modifier<F>(
+    f: &mut F,
+    node: TraitBoundModifier,
+) -> TraitBoundModifier
+where
+    F: Fold + ?Sized,
+{
+    match node {
+        TraitBoundModifier::None => TraitBoundModifier::None,
+        TraitBoundModifier::Maybe(_binding_0) => {
+            TraitBoundModifier::Maybe(Token![?](tokens_helper(f, &_binding_0.spans)))
+        }
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_trait_item<F>(f: &mut F, node: TraitItem) -> TraitItem
+where
+    F: Fold + ?Sized,
+{
+    match node {
+        TraitItem::Const(_binding_0) => {
+            TraitItem::Const(f.fold_trait_item_const(_binding_0))
+        }
+        TraitItem::Method(_binding_0) => {
+            TraitItem::Method(f.fold_trait_item_method(_binding_0))
+        }
+        TraitItem::Type(_binding_0) => {
+            TraitItem::Type(f.fold_trait_item_type(_binding_0))
+        }
+        TraitItem::Macro(_binding_0) => {
+            TraitItem::Macro(f.fold_trait_item_macro(_binding_0))
+        }
+        TraitItem::Verbatim(_binding_0) => TraitItem::Verbatim(_binding_0),
+        #[cfg(syn_no_non_exhaustive)]
+        _ => unreachable!(),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_trait_item_const<F>(f: &mut F, node: TraitItemConst) -> TraitItemConst
+where
+    F: Fold + ?Sized,
+{
+    TraitItemConst {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        const_token: Token![const](tokens_helper(f, &node.const_token.span)),
+        ident: f.fold_ident(node.ident),
+        colon_token: Token![:](tokens_helper(f, &node.colon_token.spans)),
+        ty: f.fold_type(node.ty),
+        default: (node.default)
+            .map(|it| (Token![=](tokens_helper(f, &(it).0.spans)), f.fold_expr((it).1))),
+        semi_token: Token![;](tokens_helper(f, &node.semi_token.spans)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_trait_item_macro<F>(f: &mut F, node: TraitItemMacro) -> TraitItemMacro
+where
+    F: Fold + ?Sized,
+{
+    TraitItemMacro {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        mac: f.fold_macro(node.mac),
+        semi_token: (node.semi_token).map(|it| Token![;](tokens_helper(f, &it.spans))),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_trait_item_method<F>(f: &mut F, node: TraitItemMethod) -> TraitItemMethod
+where
+    F: Fold + ?Sized,
+{
+    TraitItemMethod {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        sig: f.fold_signature(node.sig),
+        default: (node.default).map(|it| f.fold_block(it)),
+        semi_token: (node.semi_token).map(|it| Token![;](tokens_helper(f, &it.spans))),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_trait_item_type<F>(f: &mut F, node: TraitItemType) -> TraitItemType
+where
+    F: Fold + ?Sized,
+{
+    TraitItemType {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        type_token: Token![type](tokens_helper(f, &node.type_token.span)),
+        ident: f.fold_ident(node.ident),
+        generics: f.fold_generics(node.generics),
+        colon_token: (node.colon_token).map(|it| Token![:](tokens_helper(f, &it.spans))),
+        bounds: FoldHelper::lift(node.bounds, |it| f.fold_type_param_bound(it)),
+        default: (node.default)
+            .map(|it| (Token![=](tokens_helper(f, &(it).0.spans)), f.fold_type((it).1))),
+        semi_token: Token![;](tokens_helper(f, &node.semi_token.spans)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_type<F>(f: &mut F, node: Type) -> Type
+where
+    F: Fold + ?Sized,
+{
+    match node {
+        Type::Array(_binding_0) => Type::Array(f.fold_type_array(_binding_0)),
+        Type::BareFn(_binding_0) => Type::BareFn(f.fold_type_bare_fn(_binding_0)),
+        Type::Group(_binding_0) => Type::Group(f.fold_type_group(_binding_0)),
+        Type::ImplTrait(_binding_0) => {
+            Type::ImplTrait(f.fold_type_impl_trait(_binding_0))
+        }
+        Type::Infer(_binding_0) => Type::Infer(f.fold_type_infer(_binding_0)),
+        Type::Macro(_binding_0) => Type::Macro(f.fold_type_macro(_binding_0)),
+        Type::Never(_binding_0) => Type::Never(f.fold_type_never(_binding_0)),
+        Type::Paren(_binding_0) => Type::Paren(f.fold_type_paren(_binding_0)),
+        Type::Path(_binding_0) => Type::Path(f.fold_type_path(_binding_0)),
+        Type::Ptr(_binding_0) => Type::Ptr(f.fold_type_ptr(_binding_0)),
+        Type::Reference(_binding_0) => Type::Reference(f.fold_type_reference(_binding_0)),
+        Type::Slice(_binding_0) => Type::Slice(f.fold_type_slice(_binding_0)),
+        Type::TraitObject(_binding_0) => {
+            Type::TraitObject(f.fold_type_trait_object(_binding_0))
+        }
+        Type::Tuple(_binding_0) => Type::Tuple(f.fold_type_tuple(_binding_0)),
+        Type::Verbatim(_binding_0) => Type::Verbatim(_binding_0),
+        #[cfg(syn_no_non_exhaustive)]
+        _ => unreachable!(),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_type_array<F>(f: &mut F, node: TypeArray) -> TypeArray
+where
+    F: Fold + ?Sized,
+{
+    TypeArray {
+        bracket_token: Bracket(tokens_helper(f, &node.bracket_token.span)),
+        elem: Box::new(f.fold_type(*node.elem)),
+        semi_token: Token![;](tokens_helper(f, &node.semi_token.spans)),
+        len: f.fold_expr(node.len),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_type_bare_fn<F>(f: &mut F, node: TypeBareFn) -> TypeBareFn
+where
+    F: Fold + ?Sized,
+{
+    TypeBareFn {
+        lifetimes: (node.lifetimes).map(|it| f.fold_bound_lifetimes(it)),
+        unsafety: (node.unsafety).map(|it| Token![unsafe](tokens_helper(f, &it.span))),
+        abi: (node.abi).map(|it| f.fold_abi(it)),
+        fn_token: Token![fn](tokens_helper(f, &node.fn_token.span)),
+        paren_token: Paren(tokens_helper(f, &node.paren_token.span)),
+        inputs: FoldHelper::lift(node.inputs, |it| f.fold_bare_fn_arg(it)),
+        variadic: (node.variadic).map(|it| f.fold_variadic(it)),
+        output: f.fold_return_type(node.output),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_type_group<F>(f: &mut F, node: TypeGroup) -> TypeGroup
+where
+    F: Fold + ?Sized,
+{
+    TypeGroup {
+        group_token: Group(tokens_helper(f, &node.group_token.span)),
+        elem: Box::new(f.fold_type(*node.elem)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_type_impl_trait<F>(f: &mut F, node: TypeImplTrait) -> TypeImplTrait
+where
+    F: Fold + ?Sized,
+{
+    TypeImplTrait {
+        impl_token: Token![impl](tokens_helper(f, &node.impl_token.span)),
+        bounds: FoldHelper::lift(node.bounds, |it| f.fold_type_param_bound(it)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_type_infer<F>(f: &mut F, node: TypeInfer) -> TypeInfer
+where
+    F: Fold + ?Sized,
+{
+    TypeInfer {
+        underscore_token: Token![_](tokens_helper(f, &node.underscore_token.spans)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_type_macro<F>(f: &mut F, node: TypeMacro) -> TypeMacro
+where
+    F: Fold + ?Sized,
+{
+    TypeMacro {
+        mac: f.fold_macro(node.mac),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_type_never<F>(f: &mut F, node: TypeNever) -> TypeNever
+where
+    F: Fold + ?Sized,
+{
+    TypeNever {
+        bang_token: Token![!](tokens_helper(f, &node.bang_token.spans)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_type_param<F>(f: &mut F, node: TypeParam) -> TypeParam
+where
+    F: Fold + ?Sized,
+{
+    TypeParam {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        ident: f.fold_ident(node.ident),
+        colon_token: (node.colon_token).map(|it| Token![:](tokens_helper(f, &it.spans))),
+        bounds: FoldHelper::lift(node.bounds, |it| f.fold_type_param_bound(it)),
+        eq_token: (node.eq_token).map(|it| Token![=](tokens_helper(f, &it.spans))),
+        default: (node.default).map(|it| f.fold_type(it)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_type_param_bound<F>(f: &mut F, node: TypeParamBound) -> TypeParamBound
+where
+    F: Fold + ?Sized,
+{
+    match node {
+        TypeParamBound::Trait(_binding_0) => {
+            TypeParamBound::Trait(f.fold_trait_bound(_binding_0))
+        }
+        TypeParamBound::Lifetime(_binding_0) => {
+            TypeParamBound::Lifetime(f.fold_lifetime(_binding_0))
+        }
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_type_paren<F>(f: &mut F, node: TypeParen) -> TypeParen
+where
+    F: Fold + ?Sized,
+{
+    TypeParen {
+        paren_token: Paren(tokens_helper(f, &node.paren_token.span)),
+        elem: Box::new(f.fold_type(*node.elem)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_type_path<F>(f: &mut F, node: TypePath) -> TypePath
+where
+    F: Fold + ?Sized,
+{
+    TypePath {
+        qself: (node.qself).map(|it| f.fold_qself(it)),
+        path: f.fold_path(node.path),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_type_ptr<F>(f: &mut F, node: TypePtr) -> TypePtr
+where
+    F: Fold + ?Sized,
+{
+    TypePtr {
+        star_token: Token![*](tokens_helper(f, &node.star_token.spans)),
+        const_token: (node.const_token)
+            .map(|it| Token![const](tokens_helper(f, &it.span))),
+        mutability: (node.mutability).map(|it| Token![mut](tokens_helper(f, &it.span))),
+        elem: Box::new(f.fold_type(*node.elem)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_type_reference<F>(f: &mut F, node: TypeReference) -> TypeReference
+where
+    F: Fold + ?Sized,
+{
+    TypeReference {
+        and_token: Token![&](tokens_helper(f, &node.and_token.spans)),
+        lifetime: (node.lifetime).map(|it| f.fold_lifetime(it)),
+        mutability: (node.mutability).map(|it| Token![mut](tokens_helper(f, &it.span))),
+        elem: Box::new(f.fold_type(*node.elem)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_type_slice<F>(f: &mut F, node: TypeSlice) -> TypeSlice
+where
+    F: Fold + ?Sized,
+{
+    TypeSlice {
+        bracket_token: Bracket(tokens_helper(f, &node.bracket_token.span)),
+        elem: Box::new(f.fold_type(*node.elem)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_type_trait_object<F>(f: &mut F, node: TypeTraitObject) -> TypeTraitObject
+where
+    F: Fold + ?Sized,
+{
+    TypeTraitObject {
+        dyn_token: (node.dyn_token).map(|it| Token![dyn](tokens_helper(f, &it.span))),
+        bounds: FoldHelper::lift(node.bounds, |it| f.fold_type_param_bound(it)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_type_tuple<F>(f: &mut F, node: TypeTuple) -> TypeTuple
+where
+    F: Fold + ?Sized,
+{
+    TypeTuple {
+        paren_token: Paren(tokens_helper(f, &node.paren_token.span)),
+        elems: FoldHelper::lift(node.elems, |it| f.fold_type(it)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_un_op<F>(f: &mut F, node: UnOp) -> UnOp
+where
+    F: Fold + ?Sized,
+{
+    match node {
+        UnOp::Deref(_binding_0) => {
+            UnOp::Deref(Token![*](tokens_helper(f, &_binding_0.spans)))
+        }
+        UnOp::Not(_binding_0) => {
+            UnOp::Not(Token![!](tokens_helper(f, &_binding_0.spans)))
+        }
+        UnOp::Neg(_binding_0) => {
+            UnOp::Neg(Token![-](tokens_helper(f, &_binding_0.spans)))
+        }
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_use_glob<F>(f: &mut F, node: UseGlob) -> UseGlob
+where
+    F: Fold + ?Sized,
+{
+    UseGlob {
+        star_token: Token![*](tokens_helper(f, &node.star_token.spans)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_use_group<F>(f: &mut F, node: UseGroup) -> UseGroup
+where
+    F: Fold + ?Sized,
+{
+    UseGroup {
+        brace_token: Brace(tokens_helper(f, &node.brace_token.span)),
+        items: FoldHelper::lift(node.items, |it| f.fold_use_tree(it)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_use_name<F>(f: &mut F, node: UseName) -> UseName
+where
+    F: Fold + ?Sized,
+{
+    UseName {
+        ident: f.fold_ident(node.ident),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_use_path<F>(f: &mut F, node: UsePath) -> UsePath
+where
+    F: Fold + ?Sized,
+{
+    UsePath {
+        ident: f.fold_ident(node.ident),
+        colon2_token: Token![::](tokens_helper(f, &node.colon2_token.spans)),
+        tree: Box::new(f.fold_use_tree(*node.tree)),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_use_rename<F>(f: &mut F, node: UseRename) -> UseRename
+where
+    F: Fold + ?Sized,
+{
+    UseRename {
+        ident: f.fold_ident(node.ident),
+        as_token: Token![as](tokens_helper(f, &node.as_token.span)),
+        rename: f.fold_ident(node.rename),
+    }
+}
+#[cfg(feature = "full")]
+pub fn fold_use_tree<F>(f: &mut F, node: UseTree) -> UseTree
+where
+    F: Fold + ?Sized,
+{
+    match node {
+        UseTree::Path(_binding_0) => UseTree::Path(f.fold_use_path(_binding_0)),
+        UseTree::Name(_binding_0) => UseTree::Name(f.fold_use_name(_binding_0)),
+        UseTree::Rename(_binding_0) => UseTree::Rename(f.fold_use_rename(_binding_0)),
+        UseTree::Glob(_binding_0) => UseTree::Glob(f.fold_use_glob(_binding_0)),
+        UseTree::Group(_binding_0) => UseTree::Group(f.fold_use_group(_binding_0)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_variadic<F>(f: &mut F, node: Variadic) -> Variadic
+where
+    F: Fold + ?Sized,
+{
+    Variadic {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        dots: Token![...](tokens_helper(f, &node.dots.spans)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_variant<F>(f: &mut F, node: Variant) -> Variant
+where
+    F: Fold + ?Sized,
+{
+    Variant {
+        attrs: FoldHelper::lift(node.attrs, |it| f.fold_attribute(it)),
+        ident: f.fold_ident(node.ident),
+        fields: f.fold_fields(node.fields),
+        discriminant: (node.discriminant)
+            .map(|it| (Token![=](tokens_helper(f, &(it).0.spans)), f.fold_expr((it).1))),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_vis_crate<F>(f: &mut F, node: VisCrate) -> VisCrate
+where
+    F: Fold + ?Sized,
+{
+    VisCrate {
+        crate_token: Token![crate](tokens_helper(f, &node.crate_token.span)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_vis_public<F>(f: &mut F, node: VisPublic) -> VisPublic
+where
+    F: Fold + ?Sized,
+{
+    VisPublic {
+        pub_token: Token![pub](tokens_helper(f, &node.pub_token.span)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_vis_restricted<F>(f: &mut F, node: VisRestricted) -> VisRestricted
+where
+    F: Fold + ?Sized,
+{
+    VisRestricted {
+        pub_token: Token![pub](tokens_helper(f, &node.pub_token.span)),
+        paren_token: Paren(tokens_helper(f, &node.paren_token.span)),
+        in_token: (node.in_token).map(|it| Token![in](tokens_helper(f, &it.span))),
+        path: Box::new(f.fold_path(*node.path)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_visibility<F>(f: &mut F, node: Visibility) -> Visibility
+where
+    F: Fold + ?Sized,
+{
+    match node {
+        Visibility::Public(_binding_0) => {
+            Visibility::Public(f.fold_vis_public(_binding_0))
+        }
+        Visibility::Crate(_binding_0) => Visibility::Crate(f.fold_vis_crate(_binding_0)),
+        Visibility::Restricted(_binding_0) => {
+            Visibility::Restricted(f.fold_vis_restricted(_binding_0))
+        }
+        Visibility::Inherited => Visibility::Inherited,
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_where_clause<F>(f: &mut F, node: WhereClause) -> WhereClause
+where
+    F: Fold + ?Sized,
+{
+    WhereClause {
+        where_token: Token![where](tokens_helper(f, &node.where_token.span)),
+        predicates: FoldHelper::lift(node.predicates, |it| f.fold_where_predicate(it)),
+    }
+}
+#[cfg(any(feature = "derive", feature = "full"))]
+pub fn fold_where_predicate<F>(f: &mut F, node: WherePredicate) -> WherePredicate
+where
+    F: Fold + ?Sized,
+{
+    match node {
+        WherePredicate::Type(_binding_0) => {
+            WherePredicate::Type(f.fold_predicate_type(_binding_0))
+        }
+        WherePredicate::Lifetime(_binding_0) => {
+            WherePredicate::Lifetime(f.fold_predicate_lifetime(_binding_0))
+        }
+        WherePredicate::Eq(_binding_0) => {
+            WherePredicate::Eq(f.fold_predicate_eq(_binding_0))
+        }
+    }
+}