EarlyParsedAttribute in rustc_ast::ast - Rust
Description: Some attributes are stored in parsed form in the AST. This is done for performance reasons, so the attributes don’t need to be reparsed on every use.

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## EarlyParsedAttribute

# Enum EarlyParsedAttribute

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    pub enum EarlyParsedAttribute {
        CfgTrace(CfgEntry),
        CfgAttrTrace,
    }

Expand description

Some attributes are stored in parsed form in the AST. This is done for performance reasons, so the attributes don’t need to be reparsed on every use.

Currently all early parsed attributes are excluded from pretty printing at rustc_ast_pretty::pprust::state::print_attribute_inline. When adding new early parsed attributes, consider whether they should be pretty printed.

## Variants§

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### CfgTrace(CfgEntry)

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### CfgAttrTrace

## Trait Implementations§

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### impl Clone for EarlyParsedAttribute

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#### fn clone(&self) -> EarlyParsedAttribute

Returns a duplicate of the value. Read more
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#### fn clone_from(&mut self, source: &Self)

Performs copy-assignment from `source`. Read more
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### impl Debug for EarlyParsedAttribute

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#### fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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### impl<__D: SpanDecoder> Decodable<__D> for EarlyParsedAttribute

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#### fn decode(__decoder: &mut __D) -> Self

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### impl<__E: SpanEncoder> Encodable<__E> for EarlyParsedAttribute

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#### fn encode(&self, __encoder: &mut __E)

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### impl<__CTX> HashStable<__CTX> for EarlyParsedAttribute
where __CTX: HashStableContext,

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#### fn hash_stable(&self, __hcx: &mut __CTX, __hasher: &mut StableHasher)

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### impl<V: MutVisitor> MutVisitable<V> for EarlyParsedAttribute

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#### type Extra = ()

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#### fn visit_mut(&mut self, _vis: &mut V, _extra: Self::Extra) -> V::Result

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### impl<'a, V: Visitor<'a>> Visitable<'a, V> for EarlyParsedAttribute

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#### type Extra = ()

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#### fn visit(&'a self, _vis: &mut V, _extra: Self::Extra) -> V::Result

## Auto Trait Implementations§

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### impl DynSend for EarlyParsedAttribute

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### impl DynSync for EarlyParsedAttribute

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### impl Freeze for EarlyParsedAttribute

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### impl RefUnwindSafe for EarlyParsedAttribute

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### impl Send for EarlyParsedAttribute

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### impl Sync for EarlyParsedAttribute

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### impl Unpin for EarlyParsedAttribute

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### impl UnsafeUnpin for EarlyParsedAttribute

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### impl UnwindSafe for EarlyParsedAttribute

## 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> CloneToUninit for T
where T: Clone,

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#### unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (`clone_to_uninit`)
Performs copy-assignment from `self` to `dest`. 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> MutVisitorResult for T

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#### type Result = ()

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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> ToOwned for T
where T: Clone,

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#### type Owned = T

The resulting type after obtaining ownership.
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#### fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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#### fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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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<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

## 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: 24 bytes

Size for each variant:

- `CfgTrace`: 24 bytes
- `CfgAttrTrace`: 0 bytes