/CHANGES/system-result-value
#! | 17 lines | 13 code | 4 blank | 0 comment | 0 complexity | 23892b18b1d6d27c2b25834d0f10b2f1 MD5 | raw file
1In mzscheme, 'system returns #t if the command it ran failed and #f otherwise. 2This hack makes that information available in arc; 'system returns t on success 3and nil on failure. In vanilla arc, 'system always returns nil. 4 5In vanilla arc: 6 7 arc> (system "false") 8 nil 9 arc> (system "true") 10 nil 11 12With this hack: 13 14 arc> (system "false") 15 nil 16 arc> (system "true") 17 t