Enum syntax::ext::base::SyntaxExtension

pub enum SyntaxExtension {
    NonMacroAttr {
        mark_used: bool,
    },
    MultiDecorator(Box<MultiItemDecorator + Sync + Send>),
    MultiModifier(Box<MultiItemModifier + Sync + Send>),
    ProcMacro {
        expander: Box<ProcMacro + Sync + Send>,
        allow_internal_unstable: bool,
        edition: Edition,
    },
    AttrProcMacro(Box<AttrProcMacro + Sync + Send>, Edition),
    NormalTT {
        expander: Box<TTMacroExpander + Sync + Send>,
        def_info: Option<(NodeId, Span)>,
        allow_internal_unstable: bool,
        allow_internal_unsafe: bool,
        local_inner_macros: bool,
        unstable_feature: Option<(Symbol, u32)>,
        edition: Edition,
    },
    IdentTT(Box<IdentMacroExpander + Sync + Send>, Option<Span>, bool),
    ProcMacroDerive(Box<MultiItemModifier + Sync + Send>, Vec<Symbol>, Edition),
    BuiltinDerive(BuiltinDeriveFn),
    DeclMacro {
        expander: Box<TTMacroExpander + Sync + Send>,
        def_info: Option<(NodeId, Span)>,
        is_transparent: bool,
        edition: Edition,
    },
}

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An enum representing the different kinds of syntax extensions.

Variants

NonMacroAttr

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A trivial "extension" that does nothing, only keeps the attribute and marks it as known.

Fields of NonMacroAttr

mark_used: bool

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MultiDecorator(Box<MultiItemDecorator + Sync + Send>)

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A syntax extension that is attached to an item and creates new items based upon it.

#[derive(...)] is a MultiItemDecorator.

Prefer ProcMacro or MultiModifier since they are more flexible.

MultiModifier(Box<MultiItemModifier + Sync + Send>)

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A syntax extension that is attached to an item and modifies it in-place. Also allows decoration, i.e., creating new items.

ProcMacro

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A function-like procedural macro. TokenStream -> TokenStream.

Fields of ProcMacro

expander: Box<ProcMacro + Sync + Send>	🔬 This is a nightly-only experimental API. (rustc_private) this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?
allow_internal_unstable: bool	🔬 This is a nightly-only experimental API. (rustc_private) this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?
edition: Edition	🔬 This is a nightly-only experimental API. (rustc_private) this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

AttrProcMacro(Box<AttrProcMacro + Sync + Send>, Edition)

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An attribute-like procedural macro. TokenStream, TokenStream -> TokenStream. The first TokenSteam is the attribute, the second is the annotated item. Allows modification of the input items and adding new items, similar to MultiModifier, but uses TokenStreams, rather than AST nodes.

NormalTT

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A normal, function-like syntax extension.

bytes! is a NormalTT.

Fields of NormalTT

expander: Box<TTMacroExpander + Sync + Send>	🔬 This is a nightly-only experimental API. (rustc_private) this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?
def_info: Option<(NodeId, Span)>	🔬 This is a nightly-only experimental API. (rustc_private) this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?
allow_internal_unstable: bool	🔬 This is a nightly-only experimental API. (rustc_private) this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead? Whether the contents of the macro can directly use #[unstable] things (true == yes).
allow_internal_unsafe: bool	🔬 This is a nightly-only experimental API. (rustc_private) this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead? Whether the contents of the macro can use unsafe without triggering the unsafe_code lint.
local_inner_macros: bool	🔬 This is a nightly-only experimental API. (rustc_private) this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead? Enables the macro helper hack (ident!(...) -> $crate::ident!(...)) for a given macro.
unstable_feature: Option<(Symbol, u32)>	🔬 This is a nightly-only experimental API. (rustc_private) this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead? The macro's feature name if it is unstable, and the stability feature
edition: Edition	🔬 This is a nightly-only experimental API. (rustc_private) this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead? Edition of the crate in which the macro is defined

IdentTT(Box<IdentMacroExpander + Sync + Send>, Option<Span>, bool)

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A function-like syntax extension that has an extra ident before the block.

ProcMacroDerive(Box<MultiItemModifier + Sync + Send>, Vec<Symbol>, Edition)

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An attribute-like procedural macro. TokenStream -> TokenStream. The input is the annotated item. Allows generating code to implement a Trait for a given struct or enum item.

BuiltinDerive(BuiltinDeriveFn)

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An attribute-like procedural macro that derives a builtin trait.

DeclMacro

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A declarative macro, e.g. macro m() {}.

Fields of DeclMacro

expander: Box<TTMacroExpander + Sync + Send>	🔬 This is a nightly-only experimental API. (rustc_private) this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?
def_info: Option<(NodeId, Span)>	🔬 This is a nightly-only experimental API. (rustc_private) this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?
is_transparent: bool	🔬 This is a nightly-only experimental API. (rustc_private) this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?
edition: Edition	🔬 This is a nightly-only experimental API. (rustc_private) this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

Methods

impl SyntaxExtension

pub fn kind(&self) -> MacroKind

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Return which kind of macro calls this syntax extension.

pub fn default_transparency(&self) -> Transparency

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pub fn edition(&self) -> Edition

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