wenzelm [Sat, 14 Jan 2006 17:14:16 +0100] rev 18683
Output.error_msg;
wenzelm [Sat, 14 Jan 2006 17:14:15 +0100] rev 18682
removed special ERROR handling stuff (transform_error etc.);
moved plain ERROR/error to library.ML;
added toplevel_errors, exception TOPLEVEL_ERROR;
error_msg, panic, info, debug no longer pervasive;
wenzelm [Sat, 14 Jan 2006 17:14:14 +0100] rev 18681
added exception ERROR, error, cat_error, sys_error, assert, deny, assert_all;
added transform_failure;
added prefix;