Struct syntax::ext::base::SyntaxExtension

pub struct SyntaxExtension {
    pub kind: SyntaxExtensionKind,
    pub def_info: Option<(NodeId, Span)>,
    pub default_transparency: Transparency,
    pub allow_internal_unstable: Option<Lrc<[Symbol]>>,
    pub allow_internal_unsafe: bool,
    pub local_inner_macros: bool,
    pub unstable_feature: Option<(Symbol, u32)>,
    pub helper_attrs: Vec<Symbol>,
    pub edition: Edition,
}

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

Fields

kind: SyntaxExtensionKind

A syntax extension kind.

def_info: Option<(NodeId, Span)>

Some info about the macro's definition point.

default_transparency: Transparency

Hygienic properties of spans produced by this macro by default.

allow_internal_unstable: Option<Lrc<[Symbol]>>

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

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.

unstable_feature: Option<(Symbol, u32)>

The macro's feature name and tracking issue number if it is unstable.

helper_attrs: Vec<Symbol>

Names of helper attributes registered by this macro.

edition: Edition

Edition of the crate in which this macro is defined.

Methods

impl SyntaxExtension

pub fn macro_kind(&self) -> MacroKind

Returns which kind of macro calls this syntax extension.

pub fn default(kind: SyntaxExtensionKind, edition: Edition) -> SyntaxExtension

Constructs a syntax extension with default properties.

pub fn expn_info(&self, call_site: Span, format: &str) -> ExpnInfo