Hamlet gives a confusing error for trailing whitespace after $maybe syntax

[rehno-lindeque]

If you have trailing whitespace after the last argument of $maybe or directly after $nothing a compile error such as this occurs:

(line 38, column 4):\nunexpected \"n\"\nexpecting end of input, \"\\n\" or \"\\r\\n\""

Not sure if the same happens for other command like $if and such...

[snoyberg]

I've just released version 0.5.0.2 which makes trailing whitespace legal. Thanks for noticing this.