Enum syntax::ext::base::SyntaxExtensionUnstable

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

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. #[derive(...)] is an ItemDecorator.
Modifier	A syntax extension that is attached to an item and modifies it in-place.
MultiModifier	A syntax extension that is attached to an item and modifies it in-place. More flexible version than Modifier.
NormalTT	A normal, function-like syntax extension. bytes! is a NormalTT. The bool dictates whether the contents of the macro can directly use #[unstable] things (true == yes).
IdentTT	A function-like syntax extension that has an extra ident before the block.
MacroRulesTT	Represents macro_rules! itself.