Wed, 03 Nov 2010 10:51:40 +0100 wenzelm try_param_tac: plain user error appears more appropriate;
Wed, 03 Nov 2010 10:48:55 +0100 wenzelm replaced ancient sys_error by raise Fail, assuming that the latter is not handled specifically by the environment;
Wed, 03 Nov 2010 10:20:37 +0100 wenzelm eliminated dead code;
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