Trait SingleAttributeParser 

pub(crate) trait SingleAttributeParser: 'static {
    const PATH: &[Symbol];
    const STABILITY: AttributeStability;
    const ALLOWED_TARGETS: AllowedTargets;
    const TEMPLATE: AttributeTemplate;
    const ON_DUPLICATE: OnDuplicate = OnDuplicate::Error;
    const SAFETY: AttributeSafety = AttributeSafety::Normal;

    // Required method
    fn convert(
        cx: &mut AcceptContext<'_, '_>,
        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 STABILITY: AttributeStability

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

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

Provided Associated Constants

const ON_DUPLICATE: OnDuplicate = OnDuplicate::Error

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

const SAFETY: AttributeSafety = AttributeSafety::Normal

Required Methods

fn convert( cx: &mut AcceptContext<'_, '_>, 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".

Implementors

impl SingleAttributeParser for CfiEncodingParser

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability

impl SingleAttributeParser for CollapseDebugInfoParser

const PATH: &[Symbol]

const TEMPLATE: AttributeTemplate

const ALLOWED_TARGETS: AllowedTargets

const STABILITY: AttributeStability = AttributeStability::Stable

impl SingleAttributeParser for CoverageParser

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability

impl SingleAttributeParser for CrateNameParser

const PATH: &[Symbol]

const ON_DUPLICATE: OnDuplicate = OnDuplicate::WarnButFutureError

const TEMPLATE: AttributeTemplate

const ALLOWED_TARGETS: AllowedTargets

const STABILITY: AttributeStability = AttributeStability::Stable

impl SingleAttributeParser for CustomMirParser

const PATH: &[Symbol]

const STABILITY: AttributeStability

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

impl SingleAttributeParser for DeprecatedParser

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability = AttributeStability::Stable

impl SingleAttributeParser for DoNotRecommendParser

const PATH: &[Symbol]

const ON_DUPLICATE: OnDuplicate = OnDuplicate::Warn

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability = AttributeStability::Stable

impl SingleAttributeParser for ExportNameParser

const PATH: &[Symbol]

const ON_DUPLICATE: OnDuplicate = OnDuplicate::WarnButFutureError

const SAFETY: AttributeSafety

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability = AttributeStability::Stable

impl SingleAttributeParser for IgnoreParser

const PATH: &[Symbol]

const ON_DUPLICATE: OnDuplicate = OnDuplicate::Warn

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability = AttributeStability::Stable

impl SingleAttributeParser for InlineParser

const PATH: &[Symbol]

const ON_DUPLICATE: OnDuplicate = OnDuplicate::WarnButFutureError

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability = AttributeStability::Stable

impl SingleAttributeParser for InstructionSetParser

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability = AttributeStability::Stable

impl SingleAttributeParser for LangParser

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability

impl SingleAttributeParser for LinkNameParser

const PATH: &[Symbol]

const ON_DUPLICATE: OnDuplicate = OnDuplicate::WarnButFutureError

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability = AttributeStability::Stable

impl SingleAttributeParser for LinkOrdinalParser

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability = AttributeStability::Stable

impl SingleAttributeParser for LinkSectionParser

const PATH: &[Symbol]

const ON_DUPLICATE: OnDuplicate = OnDuplicate::WarnButFutureError

const SAFETY: AttributeSafety

const STABILITY: AttributeStability = AttributeStability::Stable

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

impl SingleAttributeParser for LinkageParser

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability

impl SingleAttributeParser for MacroExportParser

const PATH: &[Symbol]

const ON_DUPLICATE: OnDuplicate = OnDuplicate::Warn

const TEMPLATE: AttributeTemplate

const ALLOWED_TARGETS: AllowedTargets

const STABILITY: AttributeStability = AttributeStability::Stable

impl SingleAttributeParser for MoveSizeLimitParser

const PATH: &[Symbol]

const TEMPLATE: AttributeTemplate

const ALLOWED_TARGETS: AllowedTargets

const STABILITY: AttributeStability

impl SingleAttributeParser for MustNotSuspendParser

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability

impl SingleAttributeParser for MustUseParser

const PATH: &[Symbol]

const ON_DUPLICATE: OnDuplicate = OnDuplicate::WarnButFutureError

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability = AttributeStability::Stable

impl SingleAttributeParser for OptimizeParser

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability

impl SingleAttributeParser for PatchableFunctionEntryParser

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability

impl SingleAttributeParser for PathParser

const PATH: &[Symbol]

const ON_DUPLICATE: OnDuplicate = OnDuplicate::WarnButFutureError

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability = AttributeStability::Stable

impl SingleAttributeParser for PatternComplexityLimitParser

const PATH: &[Symbol]

const TEMPLATE: AttributeTemplate

const ALLOWED_TARGETS: AllowedTargets

const STABILITY: AttributeStability

impl SingleAttributeParser for ProcMacroDeriveParser

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets = PROC_MACRO_ALLOWED_TARGETS

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability = AttributeStability::Stable

impl SingleAttributeParser for RecursionLimitParser

const PATH: &[Symbol]

const ON_DUPLICATE: OnDuplicate = OnDuplicate::WarnButFutureError

const TEMPLATE: AttributeTemplate

const ALLOWED_TARGETS: AllowedTargets

const STABILITY: AttributeStability = AttributeStability::Stable

impl SingleAttributeParser for ReexportTestHarnessMainParser

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability

impl SingleAttributeParser for RustcAbiParser

const PATH: &[Symbol]

const TEMPLATE: AttributeTemplate

const ALLOWED_TARGETS: AllowedTargets

const STABILITY: AttributeStability

impl SingleAttributeParser for RustcAllocatorZeroedVariantParser

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability

impl SingleAttributeParser for RustcAutodiffParser

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability

impl SingleAttributeParser for RustcBuiltinMacroParser

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability

impl SingleAttributeParser for RustcDeprecatedSafe2024Parser

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability

impl SingleAttributeParser for RustcDiagnosticItemParser

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability

impl SingleAttributeParser for RustcDocPrimitiveParser

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability

impl SingleAttributeParser for RustcDummyParser

const PATH: &[Symbol]

const ON_DUPLICATE: OnDuplicate = OnDuplicate::Ignore

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability

impl SingleAttributeParser for RustcDumpDefPathParser

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability

impl SingleAttributeParser for RustcDumpSymbolNameParser

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability

impl SingleAttributeParser for RustcForceInlineParser

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

const STABILITY: AttributeStability

const TEMPLATE: AttributeTemplate

impl SingleAttributeParser for RustcIfThisChangedParser

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability

impl SingleAttributeParser for RustcLegacyConstGenericsParser

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability

impl SingleAttributeParser for RustcLintOptDenyFieldAccessParser

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability

impl SingleAttributeParser for RustcMacroTransparencyParser

const PATH: &[Symbol]

const ON_DUPLICATE: OnDuplicate

const STABILITY: AttributeStability

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

impl SingleAttributeParser for RustcMustImplementOneOfParser

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

const STABILITY: AttributeStability

const TEMPLATE: AttributeTemplate

impl SingleAttributeParser for RustcNeverTypeOptionsParser

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability

impl SingleAttributeParser for RustcObjcClassParser

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability

impl SingleAttributeParser for RustcObjcSelectorParser

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability

impl SingleAttributeParser for RustcReservationImplParser

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability

impl SingleAttributeParser for RustcScalableVectorParser

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability

impl SingleAttributeParser for RustcSimdMonomorphizeLaneLimitParser

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability

impl SingleAttributeParser for RustcSkipDuringMethodDispatchParser

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability

impl SingleAttributeParser for RustcTestMarkerParser

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

const STABILITY: AttributeStability

const TEMPLATE: AttributeTemplate

impl SingleAttributeParser for SanitizeParser

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability

impl SingleAttributeParser for ShouldPanicParser

const PATH: &[Symbol]

const ON_DUPLICATE: OnDuplicate = OnDuplicate::WarnButFutureError

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability = AttributeStability::Stable

impl SingleAttributeParser for TestRunnerParser

const PATH: &[Symbol]

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability

impl SingleAttributeParser for TypeLengthLimitParser

const PATH: &[Symbol]

const ON_DUPLICATE: OnDuplicate = OnDuplicate::WarnButFutureError

const TEMPLATE: AttributeTemplate

const ALLOWED_TARGETS: AllowedTargets

const STABILITY: AttributeStability = AttributeStability::Stable

impl SingleAttributeParser for WindowsSubsystemParser

const PATH: &[Symbol]

const ON_DUPLICATE: OnDuplicate = OnDuplicate::WarnButFutureError

const ALLOWED_TARGETS: AllowedTargets

const TEMPLATE: AttributeTemplate

const STABILITY: AttributeStability = AttributeStability::Stable

impl<T: NoArgsAttributeParser> SingleAttributeParser for WithoutArgs<T>

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

const ON_DUPLICATE: OnDuplicate = T::ON_DUPLICATE

const SAFETY: AttributeSafety = T::SAFETY

const STABILITY: AttributeStability = T::STABILITY

const ALLOWED_TARGETS: AllowedTargets = T::ALLOWED_TARGETS

const TEMPLATE: AttributeTemplate