rustc_expand::base

Enum SyntaxExtensionKind

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pub enum SyntaxExtensionKind {
    Bang(Box<dyn BangProcMacro + DynSync + DynSend>),
    LegacyBang(Box<dyn TTMacroExpander + DynSync + DynSend>),
    Attr(Box<dyn AttrProcMacro + DynSync + DynSend>),
    LegacyAttr(Box<dyn MultiItemModifier + DynSync + DynSend>),
    NonMacroAttr,
    Derive(Box<dyn MultiItemModifier + DynSync + DynSend>),
    LegacyDerive(Box<dyn MultiItemModifier + DynSync + DynSend>),
    GlobDelegation(Box<dyn GlobDelegationExpander + DynSync + DynSend>),
}
Expand description

A syntax extension kind.

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Bang(Box<dyn BangProcMacro + DynSync + DynSend>)

A token-based function-like macro.

Tuple Fields

§0: Box<dyn BangProcMacro + DynSync + DynSend>

An expander with signature TokenStream -> TokenStream.

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LegacyBang(Box<dyn TTMacroExpander + DynSync + DynSend>)

An AST-based function-like macro.

Tuple Fields

§0: Box<dyn TTMacroExpander + DynSync + DynSend>

An expander with signature TokenStream -> AST.

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Attr(Box<dyn AttrProcMacro + DynSync + DynSend>)

A token-based attribute macro.

Tuple Fields

§0: Box<dyn AttrProcMacro + DynSync + DynSend>

An expander with signature (TokenStream, TokenStream) -> TokenStream. The first TokenStream is the attribute itself, the second is the annotated item. The produced TokenStream replaces the input TokenStream.

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LegacyAttr(Box<dyn MultiItemModifier + DynSync + DynSend>)

An AST-based attribute macro.

Tuple Fields

§0: Box<dyn MultiItemModifier + DynSync + DynSend>

An expander with signature (AST, AST) -> AST. The first AST fragment is the attribute itself, the second is the annotated item. The produced AST fragment replaces the input AST fragment.

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NonMacroAttr

A trivial attribute “macro” that does nothing, only keeps the attribute and marks it as inert, thus making it ineligible for further expansion.

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Derive(Box<dyn MultiItemModifier + DynSync + DynSend>)

A token-based derive macro.

Tuple Fields

§0: Box<dyn MultiItemModifier + DynSync + DynSend>

An expander with signature TokenStream -> TokenStream. The produced TokenStream is appended to the input TokenStream.

FIXME: The text above describes how this should work. Currently it is handled identically to LegacyDerive. It should be migrated to a token-based representation like Bang and Attr, instead of using MultiItemModifier.

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LegacyDerive(Box<dyn MultiItemModifier + DynSync + DynSend>)

An AST-based derive macro.

Tuple Fields

§0: Box<dyn MultiItemModifier + DynSync + DynSend>

An expander with signature AST -> AST. The produced AST fragment is appended to the input AST fragment.

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GlobDelegation(Box<dyn GlobDelegationExpander + DynSync + DynSend>)

A glob delegation.

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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,

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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:

  • Bang: 16 bytes
  • LegacyBang: 16 bytes
  • Attr: 16 bytes
  • LegacyAttr: 16 bytes
  • NonMacroAttr: 0 bytes
  • Derive: 16 bytes
  • LegacyDerive: 16 bytes
  • GlobDelegation: 16 bytes