{"ast_node_type":"other","tokens":[{"end":99,"kind":"keyword","start":0,"text":".struct_span_err(after_eq.to(before_next),"}]}
                    .struct_span_err(after_eq.to(before_next), "missing type to the right of `=`");
                    .dcx()
                if matches!(self.token.kind, token::Comma | token::Gt) {