Trait SingleAttributeParser

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pub(crate) trait SingleAttributeParser<S: Stage>: 'static {
    const PATH: &[Symbol];
    const ATTRIBUTE_ORDER: AttributeOrder;
    const ON_DUPLICATE: OnDuplicate<S>;
    const TEMPLATE: AttributeTemplate;

    // Required method
    fn convert(
        cx: &mut AcceptContext<'_, '_, S>,
        args: &ArgParser<'_>,
    ) -> Option<AttributeKind>;
}
Expand description

Alternative to AttributeParser that automatically handles state management. A slightly simpler and more restricted way to convert attributes. Assumes that an attribute can only appear a single time on an item, and errors when it sees more.

Single<T> where T: SingleAttributeParser implements AttributeParser.

SingleAttributeParser can only convert attributes one-to-one, and cannot combine multiple attributes together like is necessary for #[stable()] and #[unstable()] for example.

Required Associated Constants§

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const PATH: &[Symbol]

The single path of the attribute this parser accepts.

If you need the parser to accept more than one path, use AttributeParser instead

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const ATTRIBUTE_ORDER: AttributeOrder

Configures the precedence of attributes with the same PATH on a syntax node.

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const ON_DUPLICATE: OnDuplicate<S>

Configures what to do when when the same attribute is applied more than once on the same syntax node.

ATTRIBUTE_ORDER specified which one is assumed to be correct, and this specified whether to, for example, warn or error on the other one.

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const TEMPLATE: AttributeTemplate

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

Required Methods§

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fn convert( cx: &mut AcceptContext<'_, '_, S>, args: &ArgParser<'_>, ) -> Option<AttributeKind>

Converts a single syntactical attribute to a single 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.

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impl<S: Stage> SingleAttributeParser<S> for ColdParser

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const PATH: &[Symbol]

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const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepLast

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const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Warn

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const TEMPLATE: AttributeTemplate

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impl<S: Stage> SingleAttributeParser<S> for ExportNameParser

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const PATH: &[Symbol]

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const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepFirst

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const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::WarnButFutureError

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const TEMPLATE: AttributeTemplate

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impl<S: Stage> SingleAttributeParser<S> for NoMangleParser

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const PATH: &[Symbol]

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const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepLast

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const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Warn

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const TEMPLATE: AttributeTemplate

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impl<S: Stage> SingleAttributeParser<S> for OptimizeParser

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const PATH: &[Symbol]

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const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepLast

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const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::WarnButFutureError

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const TEMPLATE: AttributeTemplate

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impl<S: Stage> SingleAttributeParser<S> for TrackCallerParser

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const PATH: &[Symbol]

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const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepLast

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const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Warn

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const TEMPLATE: AttributeTemplate

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impl<S: Stage> SingleAttributeParser<S> for DeprecationParser

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const PATH: &[Symbol]

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const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepFirst

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const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Error

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const TEMPLATE: AttributeTemplate

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impl<S: Stage> SingleAttributeParser<S> for InlineParser

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const PATH: &'static [Symbol]

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const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepLast

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const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::WarnButFutureError

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const TEMPLATE: AttributeTemplate

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impl<S: Stage> SingleAttributeParser<S> for RustcForceInlineParser

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const PATH: &'static [Symbol]

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const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepLast

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const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::WarnButFutureError

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const TEMPLATE: AttributeTemplate

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impl<S: Stage> SingleAttributeParser<S> for LinkNameParser

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const PATH: &[Symbol]

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const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepFirst

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const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::WarnButFutureError

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const TEMPLATE: AttributeTemplate

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impl<S: Stage> SingleAttributeParser<S> for AsPtrParser

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const PATH: &[Symbol]

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const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepFirst

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const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Error

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const TEMPLATE: AttributeTemplate

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impl<S: Stage> SingleAttributeParser<S> for PubTransparentParser

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const PATH: &[Symbol]

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const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepFirst

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const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Error

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const TEMPLATE: AttributeTemplate

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impl<S: Stage> SingleAttributeParser<S> for ConstContinueParser

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const PATH: &[Symbol]

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const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepFirst

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const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Warn

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const TEMPLATE: AttributeTemplate

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impl<S: Stage> SingleAttributeParser<S> for LoopMatchParser

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const PATH: &[Symbol]

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const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepFirst

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const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Warn

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const TEMPLATE: AttributeTemplate

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impl<S: Stage> SingleAttributeParser<S> for MustUseParser

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const PATH: &[Symbol]

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const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepLast

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const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::WarnButFutureError

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const TEMPLATE: AttributeTemplate

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impl<S: Stage> SingleAttributeParser<S> for MayDangleParser

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const PATH: &[Symbol]

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const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepFirst

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const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Warn

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const TEMPLATE: AttributeTemplate

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impl<S: Stage> SingleAttributeParser<S> for ConstStabilityIndirectParser

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const PATH: &[Symbol]

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const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepFirst

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const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Ignore

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const TEMPLATE: AttributeTemplate

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impl<S: Stage> SingleAttributeParser<S> for SkipDuringMethodDispatchParser

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const PATH: &[Symbol]

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const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepFirst

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const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Error

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const TEMPLATE: AttributeTemplate

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impl<S: Stage> SingleAttributeParser<S> for TransparencyParser