Hi David, thanks. IBM APL provides only 1-4, but I have added 5 and 6 in SVN 227.
/// Jürgen On 04/27/2014 01:18 AM, David B. Lamkins wrote:
quad-NC should return 5 for system variables and 6 for system functions (Ref: ISO 13751, pg. 175). In GNU APL, quad-NC returns negative 1 for these cases.