question: f0 - > primaryexpression f1 - > '' & '' f2 - > primaryexpression concode_field_sep String class_name concode_elem_sep String meth_name concode_field_sep placeholderType placeHolder
target: R function ( AndExpression arg0 ) { R loc0 = null ; arg0 . f0 . accept ( this ) ; arg0 . f1 . accept ( this ) ; arg0 . f2 . accept ( this ) ; return loc0 ; }