Type Definition syntax::ext::base::BuiltinDeriveFn [] [src]

type BuiltinDeriveFn = fn<'cx>(_: &'cx mut ExtCtxt, _: Span, _: &MetaItem, _: &Annotatable, _: &mut FnMut(Annotatable));
🔬 This is a nightly-only experimental API. (rustc_private)