# Struct rustc_expand::base::SyntaxExtension

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    pub struct SyntaxExtension {
        pub kind: SyntaxExtensionKind,
        pub span: Span,
        pub allow_internal_unstable: Option<Lrc<[Symbol]>>,
        pub stability: Option<Stability>,
        pub deprecation: Option<Deprecation>,
        pub helper_attrs: Vec<Symbol>,
        pub edition: Edition,
        pub builtin_name: Option<Symbol>,
        pub allow_internal_unsafe: bool,
        pub local_inner_macros: bool,
        pub collapse_debuginfo: bool,
    }

Expand description

A struct representing a macro definition in “lowered” form ready for expansion.

## Fields§

§`kind: SyntaxExtensionKind`

A syntax extension kind.

§`span: Span`

Span of the macro definition.

§`allow_internal_unstable: Option<Lrc<[Symbol]>>`

List of unstable features that are treated as stable inside this macro.

§`stability: Option<Stability>`

The macro’s stability info.

§`deprecation: Option<Deprecation>`

The macro’s deprecation info.

§`helper_attrs: Vec<Symbol>`

Names of helper attributes registered by this macro.

§`edition: Edition`

Edition of the crate in which this macro is defined.

§`builtin_name: Option<Symbol>`

Built-in macros have a couple of special properties like availability in `#[no_implicit_prelude]` modules, so we have to keep this flag.

§`allow_internal_unsafe: bool`

Suppresses the `unsafe_code` lint for code produced by this macro.

§`local_inner_macros: bool`

Enables the macro helper hack (`ident!(...)` -> `$crate::ident!(...)`) for this macro.

§`collapse_debuginfo: bool`

Should debuginfo for the macro be collapsed to the outermost expansion site (in other words, was the macro definition annotated with `#[collapse_debuginfo]`)?

## Implementations§

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### impl SyntaxExtension

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#### pub fn macro_kind(&self) -> MacroKind

Returns which kind of macro calls this syntax extension.

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#### pub fn default(kind: SyntaxExtensionKind, edition: Edition) -> SyntaxExtension

Constructs a syntax extension with default properties.

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#### fn collapse_debuginfo_by_name( sess: &Session, attr: &Attribute ) -> CollapseMacroDebuginfo

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#### fn get_collapse_debuginfo( sess: &Session, attrs: &[Attribute], is_local: bool ) -> bool

if-ext - if macro from different crate (related to callsite code) | cmd \ attr | no | (unspecified) | external | yes | | no | no | no | no | no | | (unspecified) | no | no | if-ext | yes | | external | no | if-ext | if-ext | yes | | yes | yes | yes | yes | yes |

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#### pub fn new( sess: &Session, features: &Features, kind: SyntaxExtensionKind, span: Span, helper_attrs: Vec<Symbol>, edition: Edition, name: Symbol, attrs: &[Attribute], is_local: bool ) -> SyntaxExtension

Constructs a syntax extension with the given properties and other properties converted from attributes.

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#### pub fn dummy_bang(edition: Edition) -> SyntaxExtension

A dummy bang macro `foo!()`.

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#### pub fn dummy_derive(edition: Edition) -> SyntaxExtension

A dummy derive macro `#[derive(Foo)]`.

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#### pub fn non_macro_attr(edition: Edition) -> SyntaxExtension

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#### pub fn expn_data( &self, parent: LocalExpnId, call_site: Span, descr: Symbol, macro_def_id: Option<DefId>, parent_module: Option<DefId> ) -> ExpnData

## Auto Trait Implementations§

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### impl DynSend for SyntaxExtension

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### impl DynSync for SyntaxExtension

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### impl Freeze for SyntaxExtension

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### impl !RefUnwindSafe for SyntaxExtension

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### impl !Send for SyntaxExtension

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### impl !Sync for SyntaxExtension

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### impl Unpin for SyntaxExtension

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### impl !UnwindSafe for SyntaxExtension

## 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> 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<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: 120 bytes