SYNOPSIS
        int remove_call_out(string fun)
        int remove_call_out(closure fun)

DESCRIPTION
        Remove next pending call-out for function fun in this object.
        The time left is returned.

        -1 is returned if there were no call-outs pending to this
        function.

EXAMPLE
        To remove every pending call-out to MyTimer() :

        while (remove_call_out("MyTimer") != -1) /* continue */ ;

HISTORY
        Removing a call_out to a closure was introduced in 3.2.1@45.

SEE ALSO
        call_out(E), call_out_info(E), find_call_out(E)