question: prepends a statement to a block . concode_field_sep PlaceHolder placeHolder concode_field_sep BlockStatement toBlock concode_elem_sep Expression simple concode_elem_sep BlockStatement toFunctionBlock concode_elem_sep BlockStatement toFunctionBlock
target: BlockStatement function ( Statement arg0 , BlockStatement arg1 ) { return Expressions . arg1 ( Expressions . list ( arg0 ) . appendAll ( arg1 . statements ) ) ; }