Function syntax::ext::tt::macro_rules::add_new_extensionExperimental
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pub fn add_new_extension<'cx>(cx: &'cx mut ExtCtxt, sp: Span, name: Ident, arg: Vec<TokenTree>) -> Box<MacResult + 'cx>
This procedure performs the expansion of the macro_rules! macro. It parses the RHS and adds an extension to the current context.