Forget the parseBlock returnBlock comment

[Paul Dufresne]

Oops, I see, most of the time, parseUnaryMessage call parseAtom on the 
current token,
if the token is '[', then parseAtom defined on the '[' token in token.slate, 
create a new beginBlock node, and call parseBlock with this new beginBlock 
node. So in parseBlock, we modify this directly,
and return it.

But still, I expect I will find a bug in it, just let me find it! :-)

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