Trait CombineAttributeParser 

pub(crate) trait CombineAttributeParser: 'static {
    type Item;

    const PATH: &[Symbol];
    const CONVERT: fn(ThinVec<Self::Item>, Span) -> AttributeKind;
    const ALLOWED_TARGETS: AllowedTargets;
    const TEMPLATE: AttributeTemplate;
    const SAFETY: AttributeSafety = AttributeSafety::Normal;

    // Required method
    fn extend(
        cx: &mut AcceptContext<'_, '_>,
        args: &ArgParser,
    ) -> impl IntoIterator<Item = Self::Item>;
}

Alternative to AttributeParser that automatically handles state management. If multiple attributes appear on an element, combines the values of each into a ThinVec. Combine<T> where T: CombineAttributeParser implements AttributeParser.

CombineAttributeParser can only convert a single kind of attribute, and cannot combine multiple attributes together like is necessary for #[stable()] and #[unstable()] for example.

Required Associated Constants

const PATH: &[Symbol]

const CONVERT: fn(ThinVec<Self::Item>, Span) -> AttributeKind

A function that converts individual items (of type Item) into the final attribute.

For example, individual representations from #[repr(...)] attributes into an AttributeKind::Repr(x), where x is a vec of these individual reprs.

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

The template this attribute parser should implement. Used for diagnostics.

Provided Associated Constants

const SAFETY: AttributeSafety = AttributeSafety::Normal

Required Associated Types

type Item

Required Methods

fn extend( cx: &mut AcceptContext<'_, '_>, args: &ArgParser, ) -> impl IntoIterator<Item = Self::Item>

Converts a single syntactical attribute to a number of elements of the semantic attribute, or AttributeKind

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors

impl CombineAttributeParser for AllowInternalUnstableParser

const PATH: &[Symbol]

const CONVERT: fn(ThinVec<Self::Item>, Span) -> AttributeKind

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

type Item = (Symbol, Span)

impl CombineAttributeParser for RustcAllowConstFnUnstableParser

const PATH: &[Symbol]

const CONVERT: fn(ThinVec<Self::Item>, Span) -> AttributeKind

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

type Item = Symbol

impl CombineAttributeParser for UnstableFeatureBoundParser

const PATH: &[Symbol]

const CONVERT: fn(ThinVec<Self::Item>, Span) -> AttributeKind

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

type Item = (Symbol, Span)

impl CombineAttributeParser for ForceTargetFeatureParser

const PATH: &[Symbol]

const SAFETY: AttributeSafety

const CONVERT: fn(ThinVec<Self::Item>, Span) -> AttributeKind

const TEMPLATE: AttributeTemplate

const ALLOWED_TARGETS: AllowedTargets

type Item = (Symbol, Span)

impl CombineAttributeParser for TargetFeatureParser

const PATH: &[Symbol]

const CONVERT: fn(ThinVec<Self::Item>, Span) -> AttributeKind

const TEMPLATE: AttributeTemplate

const ALLOWED_TARGETS: AllowedTargets

type Item = (Symbol, Span)

impl CombineAttributeParser for CrateTypeParser

const PATH: &[Symbol]

const CONVERT: fn(ThinVec<Self::Item>, Span) -> AttributeKind

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

type Item = CrateType

impl CombineAttributeParser for FeatureParser

const PATH: &[Symbol]

const CONVERT: fn(ThinVec<Self::Item>, Span) -> AttributeKind = AttributeKind::Feature

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

type Item = Ident

impl CombineAttributeParser for RegisterToolParser

const PATH: &[Symbol]

const CONVERT: fn(ThinVec<Self::Item>, Span) -> AttributeKind = AttributeKind::RegisterTool

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

type Item = Ident

impl CombineAttributeParser for DebuggerViualizerParser

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const CONVERT: fn(ThinVec<Self::Item>, Span) -> AttributeKind

type Item = DebugVisualizer

impl CombineAttributeParser for LinkParser

const PATH: &[Symbol]

const CONVERT: fn(ThinVec<Self::Item>, Span) -> AttributeKind = AttributeKind::Link

const TEMPLATE: AttributeTemplate

const ALLOWED_TARGETS: AllowedTargets

type Item = LinkEntry

impl CombineAttributeParser for ReprParser

const PATH: &[Symbol]

const CONVERT: fn(ThinVec<Self::Item>, Span) -> AttributeKind

const TEMPLATE: AttributeTemplate

const ALLOWED_TARGETS: AllowedTargets

type Item = (ReprAttr, Span)

impl CombineAttributeParser for RustcDumpLayoutParser

const PATH: &[Symbol]

const CONVERT: fn(ThinVec<Self::Item>, Span) -> AttributeKind

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

type Item = RustcDumpLayoutKind

impl CombineAttributeParser for RustcCleanParser

const PATH: &[Symbol]

const CONVERT: fn(ThinVec<Self::Item>, Span) -> AttributeKind

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

type Item = RustcCleanAttribute

impl CombineAttributeParser for RustcMirParser

const PATH: &[Symbol]

const CONVERT: fn(ThinVec<Self::Item>, Span) -> AttributeKind

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

type Item = RustcMirKind

impl CombineAttributeParser for RustcThenThisWouldNeedParser

const PATH: &[Symbol]

const CONVERT: fn(ThinVec<Self::Item>, Span) -> AttributeKind

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

type Item = Ident

impl CombineAttributeParser for UnstableRemovedParser

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const CONVERT: fn(ThinVec<Self::Item>, Span) -> AttributeKind

type Item = UnstableRemovedFeature