Trait SingleAttributeParser 

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

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

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

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

const ON_DUPLICATE: OnDuplicate<S>

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

Required Methods

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.

Implementors

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

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

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

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

const PATH: &[Symbol]

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

const TEMPLATE: AttributeTemplate

const ALLOWED_TARGETS: AllowedTargets

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

const PATH: &[Symbol]

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

const TEMPLATE: AttributeTemplate

const ALLOWED_TARGETS: AllowedTargets

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

const PATH: &[Symbol]

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

const TEMPLATE: AttributeTemplate

const ALLOWED_TARGETS: AllowedTargets

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

const PATH: &[Symbol]

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

const TEMPLATE: AttributeTemplate

const ALLOWED_TARGETS: AllowedTargets

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

const PATH: &[Symbol]

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

const TEMPLATE: AttributeTemplate

const ALLOWED_TARGETS: AllowedTargets

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const TEMPLATE: AttributeTemplate

const ALLOWED_TARGETS: AllowedTargets

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

const PATH: &[Symbol]

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

const TEMPLATE: AttributeTemplate

const ALLOWED_TARGETS: AllowedTargets

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets = PROC_MACRO_ALLOWED_TARGETS

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

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

const TEMPLATE: AttributeTemplate

impl<S: Stage> SingleAttributeParser<S> for RustcDeprecatedSafe2024Parser

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

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

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const TEMPLATE: AttributeTemplate

const ALLOWED_TARGETS: AllowedTargets

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

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

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

const PATH: &[Symbol]

const ON_DUPLICATE: OnDuplicate<S>

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

impl<T: NoArgsAttributeParser<S>, S: Stage> SingleAttributeParser<S> for WithoutArgs<T, S>

const PATH: &[Symbol] = T::PATH

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

const ALLOWED_TARGETS: AllowedTargets = T::ALLOWED_TARGETS

const TEMPLATE: AttributeTemplate