Just to clear up MeowChow's answer, the =>
acts like a comma AND tries to quote the word to its left.
If you confuse the parser into not knowing that it is reading
a word, it doesn't know what to quote and it complains and
dies. Basically if your words are going to have characters
other than a-zA-Z0-9_- in them, go ahead and quote it manually
and save yourself and the parser some worry.