SYNOPSIS
        mixed catch(expr, expr, ...)
        mixed catch(expr, expr, ... ; modifiers)

DESCRIPTION
        Evaluate the expressions. If there is no error, 0 is returned.
        If there is an error, the evaluation of the expressions stops at
        that point, and a string with the error message is returned.

        System error messages start with a leading '*', user-defined
        error values (other than 0) as given to throw() and raise_error() are
        returned as they are.

        If at the time the catch() is encountered less than
        __CATCH_EVAL_COST__ eval ticks are left, a runtime error will be
        thrown and the expressions will not be executed.

        The default behaviour of catch() can be changed using modifiers:

          'nolog':   Normally, the caught error will be logged in the
                     error logs for easier debugging. With this
                     modifier, the log is suppressed.

          'publish': Normally, master::runtime_error() is not called
                     for a caught error. This modifier instructs
                     catch() to call it nevertheless.

        Catch is not really an efun but a compiler directive.

EXAMPLES
        object obj;
        string err;
        if (err = catch(obj = clone_object("/foo/bar/baz")))
           write("Cannot clone object, reason:"+err"+\n");

HISTORY
        LDMud 3.2.9 introduced the 'nolog' catch() as experimental feature.
        LDMud 3.2.10 implemented 'nolog' as official form and added
          'publish'.

SEE ALSO
        throw(E), raise_error(E), predefined(D), runtime_error(M)
