Wed, 03 Nov 2010 13:54:23 +0100 wenzelm explicit warning about opaque signature matching -- saves extra paragraph in implementation manual;
Wed, 03 Nov 2010 11:33:51 +0100 wenzelm discontinued obsolete function sys_error and exception SYS_ERROR;
Wed, 03 Nov 2010 11:11:49 +0100 wenzelm replaced ancient sys_error by raise Fail, assuming that the latter is not handled specifically by the environment;
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