[REBOL] howto non_existance- check?

[riachtchenko]

Hi all,
sorry, i certainly could 've seen the solution -
but coud't find it now ;-)

>> f: func [w ] [either [ value? 'w ] [ do 'w][print "no way..."]]
>> value? 'm
== false
>> x
== 10
>> f x
== 10
>> f m
** Script Error: m has no value.
** Where: f m
>> f 'm
== m
>>
thank you
Sascha

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