# Struct rustc_builtin_macros::cfg_eval::CfgEval

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    struct CfgEval<'a, 'b> {
        cfg: &'a mut StripUnconfigured<'b>,
    }

## Fields§

§`cfg: &'a mut StripUnconfigured<'b>`

## Implementations§

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### impl CfgEval<'_, '_>

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#### fn configure<T: HasAttrs + HasTokens>(&mut self, node: T) -> Option<T>

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#### fn configure_annotatable( &mut self, annotatable: Annotatable, ) -> Option<Annotatable>

## Trait Implementations§

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### impl MutVisitor for CfgEval<'_, '_>

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#### fn visit_expr(&mut self, expr: &mut P<Expr>)

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#### fn visit_method_receiver_expr(&mut self, expr: &mut P<Expr>)

This method is a hack to workaround unstable of `stmt_expr_attributes`. It can be removed once that feature is stabilized.
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#### fn filter_map_expr(&mut self, expr: P<Expr>) -> Option<P<Expr>>

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#### fn flat_map_generic_param( &mut self, param: GenericParam, ) -> SmallVec<[GenericParam; 1]>

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#### fn flat_map_stmt(&mut self, stmt: Stmt) -> SmallVec<[Stmt; 1]>

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#### fn flat_map_item(&mut self, item: P<Item>) -> SmallVec<[P<Item>; 1]>

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#### fn flat_map_impl_item( &mut self, item: P<AssocItem>, ) -> SmallVec<[P<AssocItem>; 1]>

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#### fn flat_map_trait_item( &mut self, item: P<AssocItem>, ) -> SmallVec<[P<AssocItem>; 1]>

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#### fn flat_map_foreign_item( &mut self, foreign_item: P<ForeignItem>, ) -> SmallVec<[P<ForeignItem>; 1]>

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#### fn flat_map_arm(&mut self, arm: Arm) -> SmallVec<[Arm; 1]>

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#### fn flat_map_expr_field(&mut self, field: ExprField) -> SmallVec<[ExprField; 1]>

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#### fn flat_map_pat_field(&mut self, fp: PatField) -> SmallVec<[PatField; 1]>

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#### fn flat_map_param(&mut self, p: Param) -> SmallVec<[Param; 1]>

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#### fn flat_map_field_def(&mut self, sf: FieldDef) -> SmallVec<[FieldDef; 1]>

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#### fn flat_map_variant(&mut self, variant: Variant) -> SmallVec<[Variant; 1]>

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#### const VISIT_TOKENS: bool = false

Mutable token visiting only exists for the `macro_rules` token marker and should not be used otherwise. Token visitor would be entirely separate from the regular visitor if the marker didn’t have to visit AST fragments in nonterminal tokens.
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#### fn visit_crate(&mut self, c: &mut Crate)

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#### fn visit_meta_list_item(&mut self, list_item: &mut NestedMetaItem)

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#### fn visit_meta_item(&mut self, meta_item: &mut MetaItem)

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#### fn visit_use_tree(&mut self, use_tree: &mut UseTree)

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#### fn visit_fn_header(&mut self, header: &mut FnHeader)

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#### fn visit_fn_decl(&mut self, d: &mut P<FnDecl>)

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#### fn visit_coroutine_kind(&mut self, a: &mut CoroutineKind)

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#### fn visit_closure_binder(&mut self, b: &mut ClosureBinder)

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#### fn visit_block(&mut self, b: &mut P<Block>)

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#### fn visit_pat(&mut self, p: &mut P<Pat>)

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#### fn visit_anon_const(&mut self, c: &mut AnonConst)

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#### fn visit_generic_arg(&mut self, arg: &mut GenericArg)

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#### fn visit_ty(&mut self, t: &mut P<Ty>)

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#### fn visit_lifetime(&mut self, l: &mut Lifetime)

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#### fn visit_assoc_item_constraint(&mut self, c: &mut AssocItemConstraint)

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#### fn visit_foreign_mod(&mut self, nm: &mut ForeignMod)

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#### fn visit_ident(&mut self, i: &mut Ident)

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#### fn visit_path(&mut self, p: &mut Path)

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#### fn visit_qself(&mut self, qs: &mut Option<P<QSelf>>)

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#### fn visit_generic_args(&mut self, p: &mut GenericArgs)

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#### fn visit_angle_bracketed_parameter_data(&mut self, p: &mut AngleBracketedArgs)

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#### fn visit_parenthesized_parameter_data(&mut self, p: &mut ParenthesizedArgs)

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#### fn visit_local(&mut self, l: &mut P<Local>)

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#### fn visit_mac_call(&mut self, mac: &mut MacCall)

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#### fn visit_macro_def(&mut self, def: &mut MacroDef)

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#### fn visit_label(&mut self, label: &mut Label)

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#### fn visit_attribute(&mut self, at: &mut Attribute)

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#### fn visit_generics(&mut self, generics: &mut Generics)

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#### fn visit_trait_ref(&mut self, tr: &mut TraitRef)

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#### fn visit_poly_trait_ref(&mut self, p: &mut PolyTraitRef)

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#### fn visit_variant_data(&mut self, vdata: &mut VariantData)

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#### fn visit_param_bound(&mut self, tpb: &mut GenericBound)

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#### fn visit_precise_capturing_arg(&mut self, arg: &mut PreciseCapturingArg)

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#### fn visit_mt(&mut self, mt: &mut MutTy)

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#### fn visit_where_clause(&mut self, where_clause: &mut WhereClause)

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#### fn visit_where_predicate(&mut self, where_predicate: &mut WherePredicate)

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#### fn visit_vis(&mut self, vis: &mut Visibility)

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#### fn visit_id(&mut self, _id: &mut NodeId)

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#### fn visit_span(&mut self, _sp: &mut Span)

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#### fn visit_inline_asm(&mut self, asm: &mut InlineAsm)

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#### fn visit_inline_asm_sym(&mut self, sym: &mut InlineAsmSym)

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#### fn visit_format_args(&mut self, fmt: &mut FormatArgs)

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#### fn visit_capture_by(&mut self, capture_by: &mut CaptureBy)

## Auto Trait Implementations§

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### impl<'a, 'b> DynSend for CfgEval<'a, 'b>

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### impl<'a, 'b> DynSync for CfgEval<'a, 'b>

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### impl<'a, 'b> Freeze for CfgEval<'a, 'b>

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### impl<'a, 'b> !RefUnwindSafe for CfgEval<'a, 'b>

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### impl<'a, 'b> !Send for CfgEval<'a, 'b>

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### impl<'a, 'b> !Sync for CfgEval<'a, 'b>

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### impl<'a, 'b> Unpin for CfgEval<'a, 'b>

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### impl<'a, 'b> !UnwindSafe for CfgEval<'a, 'b>

## Blanket Implementations§

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### impl<T> Aligned for T

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#### const ALIGN: Alignment = _

Alignment of `Self`.
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### impl<T> Any for T
where T: 'static + ?Sized,

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#### fn type_id(&self) -> TypeId

Gets the `TypeId` of `self`. Read more
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### impl<T> Borrow<T> for T
where T: ?Sized,

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#### fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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### impl<T> BorrowMut<T> for T
where T: ?Sized,

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#### fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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### impl<T, R> CollectAndApply<T, R> for T

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#### fn collect_and_apply<I, F>(iter: I, f: F) -> R
where I: Iterator<Item = T>, F: FnOnce(&[T]) -> R,

Equivalent to `f(&iter.collect::<Vec<_>>())`.

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#### type Output = R

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### impl<T> Filterable for T

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#### fn filterable( self, filter_name: &'static str, ) -> RequestFilterDataProvider<T, fn(_: DataRequest<'_>) -> bool>

Creates a filterable data provider with the given name for debugging. Read more
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### impl<T> From<T> for T

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#### fn from(t: T) -> T

Returns the argument unchanged.

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### impl<T> Instrument for T

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#### fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided `Span`, returning an `Instrumented` wrapper. Read more
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#### fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current `Span`, returning an `Instrumented` wrapper. Read more
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### impl<T, U> Into<U> for T
where U: From<T>,

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#### fn into(self) -> U

Calls `U::from(self)`.

That is, this conversion is whatever the implementation of `From<T> for U` chooses to do.

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### impl<T> IntoEither for T

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#### fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts `self` into a `Left` variant of `Either<Self, Self>` if `into_left` is `true`. Converts `self` into a `Right` variant of `Either<Self, Self>` otherwise. Read more
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#### fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts `self` into a `Left` variant of `Either<Self, Self>` if `into_left(&self)` returns `true`. Converts `self` into a `Right` variant of `Either<Self, Self>` otherwise. Read more
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### impl<T> Pointable for T

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#### const ALIGN: usize = _

The alignment of pointer.
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#### type Init = T

The type for initializers.
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#### unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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#### unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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#### unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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#### unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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### impl<T> Same for T

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#### type Output = T

Should always be `Self`
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### impl<T, U> TryFrom<U> for T
where U: Into<T>,

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#### type Error = Infallible

The type returned in the event of a conversion error.
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#### fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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### impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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#### type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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### impl<I, T, U> Upcast<I, U> for T
where U: UpcastFrom<I, T>,

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#### fn upcast(self, interner: I) -> U

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### impl<I, T> UpcastFrom<I, T> for T

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#### fn upcast_from(from: T, _tcx: I) -> T

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### impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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#### fn vzip(self) -> V

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### impl<T> WithSubscriber for T

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#### fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided `Subscriber` to this type, returning a `WithDispatch` wrapper. Read more
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#### fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default `Subscriber` to this type, returning a `WithDispatch` wrapper. Read more
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### impl<'a, T> Captures<'a> for T
where T: ?Sized,

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### impl<T> ErasedDestructor for T
where T: 'static,

## Layout§

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain `repr(...)` attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 8 bytes