syntax_data: {"ast_node_type":"other","tokens":[{"end":92,"kind":"keyword","start":0,"text":"write!(f,"}]}
source_snippet:                 write!(f, "({op:?}: ({:?}: {:?}), ({:?}: {:?}))", lhs, lhs_ty, rhs, rhs_ty,)
context_before:                 let (lhs_ty, rhs_ty, lhs, rhs) = self.binop_args();
context_after:             }