pub struct SyntaxExtension {
    pub kind: SyntaxExtensionKind,
    pub span: Span,
    pub allow_internal_unstable: Option<Lrc<[Symbol]>>,
    pub stability: Option<Stability>,
    pub deprecation: Option<Deprecation>,
    pub helper_attrs: Vec<Symbol>,
    pub edition: Edition,
    pub builtin_name: Option<Symbol>,
    pub allow_internal_unsafe: bool,
    pub local_inner_macros: bool,
    pub collapse_debuginfo: bool,
Expand description

A struct representing a macro definition in “lowered” form ready for expansion.


§kind: SyntaxExtensionKind

A syntax extension kind.

§span: Span

Span of the macro definition.

§allow_internal_unstable: Option<Lrc<[Symbol]>>

List of unstable features that are treated as stable inside this macro.

§stability: Option<Stability>

The macro’s stability info.

§deprecation: Option<Deprecation>

The macro’s deprecation info.

§helper_attrs: Vec<Symbol>

Names of helper attributes registered by this macro.

§edition: Edition

Edition of the crate in which this macro is defined.

§builtin_name: Option<Symbol>

Built-in macros have a couple of special properties like availability in #[no_implicit_prelude] modules, so we have to keep this flag.

§allow_internal_unsafe: bool

Suppresses the unsafe_code lint for code produced by this macro.

§local_inner_macros: bool

Enables the macro helper hack (ident!(...) -> $crate::ident!(...)) for this macro.

§collapse_debuginfo: bool

Should debuginfo for the macro be collapsed to the outermost expansion site (in other words, was the macro definition annotated with #[collapse_debuginfo])?


Returns which kind of macro calls this syntax extension.

Constructs a syntax extension with default properties.

Constructs a syntax extension with the given properties and other properties converted from attributes.

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Gets the TypeId of self. Read more
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.


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: 120 bytes