Enum rustc_expand::base::SyntaxExtensionKind

pub enum SyntaxExtensionKind {
    Bang(Box<dyn ProcMacro + Sync + Send>),
    LegacyBang(Box<dyn TTMacroExpander + Sync + Send>),
    Attr(Box<dyn AttrProcMacro + Sync + Send>),
    LegacyAttr(Box<dyn MultiItemModifier + Sync + Send>),
    NonMacroAttr {
        mark_used: bool,
    },
    Derive(Box<dyn MultiItemModifier + Sync + Send>),
    LegacyDerive(Box<dyn MultiItemModifier + Sync + Send>),
}

A syntax extension kind.

Variants

Bang(Box<dyn ProcMacro + Sync + Send>)

A token-based function-like macro.

LegacyBang(Box<dyn TTMacroExpander + Sync + Send>)

An AST-based function-like macro.

Attr(Box<dyn AttrProcMacro + Sync + Send>)

A token-based attribute macro.

LegacyAttr(Box<dyn MultiItemModifier + Sync + Send>)

An AST-based attribute macro.

NonMacroAttr

A trivial attribute “macro” that does nothing, only keeps the attribute and marks it as inert, thus making it ineligible for further expansion.

Fields of NonMacroAttr

mark_used: bool

Suppresses the unused_attributes lint for this attribute.

Derive(Box<dyn MultiItemModifier + Sync + Send>)

A token-based derive macro.

LegacyDerive(Box<dyn MultiItemModifier + Sync + Send>)

An AST-based derive macro.

Layout

Note: Most layout information is completely unstable and may be different between compiler versions and platforms. 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: 24 bytes