syntax_data: {"ast_node_type":"other","tokens":[{"end":64,"kind":"keyword","start":0,"text":"write!(self,"}]}
source_snippet:                     write!(self, " closure_sig_as_fn_ptr_ty=")?;
context_before:                     args.as_closure().kind_ty().print(self)?;
context_after:                     args.as_closure().sig_as_fn_ptr_ty().print(self)?;