{"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"ObligationCauseCode::WhereClause(_,"}]}
                    ObligationCauseCode::WhereClause(_, span)
                match cause.code().peel_derives() {
                    | ObligationCauseCode::WhereClauseInExpr(_, span, ..)