Struct rustc_parse::parser::attr_wrapper::AttrWrapper

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pub(super) struct AttrWrapper {
    attrs: AttrVec,
    start_pos: Option<u32>,
}
Expand description

A wrapper type to ensure that the parser handles outer attributes correctly. When we parse outer attributes, we need to ensure that we capture tokens for the attribute target. This allows us to perform cfg-expansion on a token stream before we invoke a derive proc-macro.

This wrapper prevents direct access to the underlying ast::AttrVec. Parsing code can only get access to the underlying attributes by passing an AttrWrapper to collect_tokens. This makes it difficult to accidentally construct an AST node (which stores an ast::AttrVec) without first collecting tokens.

This struct has its own module, to ensure that the parser code cannot directly access the attrs field.

Fields§

§attrs: AttrVec§start_pos: Option<u32>

Implementations§

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impl AttrWrapper

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pub(super) fn new(attrs: AttrVec, start_pos: u32) -> AttrWrapper

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pub(super) fn empty() -> AttrWrapper

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pub(super) fn take_for_recovery(self, psess: &ParseSess) -> AttrVec

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pub(super) fn prepend_to_nt_inner(self, attrs: &mut AttrVec)

Prepend self.attrs to attrs.

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pub(super) fn is_empty(&self) -> bool

Trait Implementations§

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impl Clone for AttrWrapper

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fn clone(&self) -> AttrWrapper

Returns a copy 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 AttrWrapper

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

Formats the value using the given formatter. Read more

Auto Trait 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

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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
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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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fn filterable( self, filter_name: &'static str, ) -> RequestFilterDataProvider<T, fn(_: DataRequest<'_>) -> bool>

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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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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, U> TryFrom<U> for 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
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type Error = <U as TryFrom<T>>::Error

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Performs the conversion.
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fn upcast(self, interner: I) -> U

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

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impl<V, T> VZip<V> for T
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where S: Into<Dispatch>,

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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: 16 bytes