parsing of ^ is now OK

[Paul Dufresne]

Ok, All is fine now with ^ value!

All I changed was in:

((token selector = #^ or: [token selector = #^^]) and: [argument isNil])
          ifTrue:
            [
              node:
              ...
              node value: argument  <--- replaced argument by (p 
parseUnaryMessage).
            ]

So it was not what I told it was, it was just that the argument of 
ReturnNode was wrong (Nil).

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