{"ast_node_type":"other","tokens":[{"end":57,"kind":"keyword","start":0,"text":"sess.dcx().span_err(token.span,"}]}
                    sess.dcx().span_err(token.span, msg);
                        format!("expected identifier, found `{}`", pprust::token_to_string(token),);
                    TokenTree::MetaVar(token.span, Ident::dummy())