D.12.2 mtwist exceptions

• <'memory overflow'> can be returned if there is insufficient memory to allocate a result.
• Messages of <'missing value'> and <'invalid value'> can be returned if any floating point argument is nil or is not a valid floating point number, unless there is a designated default interpretation for nil as in bern and u_cont.
• A message of <'bad mtwist specification'> is returned if an argument to the bern function is not in the range of 0 to 1, or if any probability passed to the w_* functions is negative.
• A message of <'draw from empty list'> is returned if an argument to the *_enum functions is nil or if an argument to w_enum contains nil.

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