syntax_data: {"ast_node_type":"other","tokens":[{"end":34,"kind":"keyword","start":0,"text":"write!(p,"}]}
source_snippet:             write!(p, "{kind}(")?;
context_before:         self.wrap_binder(&sig, WrapBinderMode::ForAll, |sig, p| {
context_after:             for (i, arg) in sig.inputs()[0].tuple_fields().iter().enumerate() {