[Haskell-beginners] undefined symbol not allowed?

[Christopher Howard]

I'm one of those evil people who loves to sprinkle Unicode throughout my 
code. I thought it was pretty cool when I learned about the 
UnicodeSyntax language extension, as well as the base-unicode-symbols 
package. However, I am a little perplexed that this symbol is not 
provided by either of those:

⊥

That is, the "bottom" symbol, Unicode #22A5 (\8869), which I have seen 
in some programming texts as representing the undefined expression.

I tried just defining

⊥ = undefined

But ghc won't parse that. Why is this? And is there a way to make it work?

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