syntax_data: {"ast_node_type":"other","tokens":[{"end":39,"kind":"keyword","start":0,"text":"ty::ExprKind::UnOp(op)"}]}
source_snippet:             ty::ExprKind::UnOp(op) => {
context_before:             }
context_after:                 let (rhs_ty, rhs) = self.unop_args();