Enum syntax::ext::base::SyntaxExtensionExperimental

pub enum SyntaxExtension {
    Decorator(Box<ItemDecorator + 'static>),
    Modifier(Box<ItemModifier + 'static>),
    NormalTT(Box<TTMacroExpander + 'static>, Option<Span>),
    IdentTT(Box<IdentMacroExpander + 'static>, Option<Span>),
    LetSyntaxTT(Box<IdentMacroExpander + 'static>, Option<Span>),
}

An enum representing the different kinds of syntax extensions.

Variants

Decorator	A syntax extension that is attached to an item and creates new items based upon it. #[deriving(...)] is an ItemDecorator.
Modifier	A syntax extension that is attached to an item and modifies it in-place.
NormalTT	A normal, function-like syntax extension. bytes! is a NormalTT.
IdentTT	A function-like syntax extension that has an extra ident before the block.
LetSyntaxTT	An ident macro that has two properties: - it adds a macro definition to the environment, and - the definition it adds doesn't introduce any new identifiers. macro_rules! is a LetSyntaxTT