1:8-22 TModule "TQualifiedName" 3:18-27 TModule "Data.List" 6:1-2 TVariable "a" 6:5-13 TModule "Prelude." 6:13-22 TVariable "undefined" 7:1-2 TVariable "b" 7:8-18 TModule "Data.List." 7:18-22 TClassMethod "elem" 8:1-2 TVariable "c" 8:6-14 TModule "Prelude." 8:14-15 TOperator "+" 9:1-2 TVariable "d" 9:6-7 TOperator "+"