Tom Ellis:
If I were writing a Haskell compiler I could certainly define 'IO' to be a
datatype that would allow me to compare 'putStr "c"' to itself. The
comparison could not be of operational equivalence, but it would still be
possible to compare values in IO in a reasonable sense.
Would you add to all this:
getLine == getLine
etc.?
Good luck!
I suspect that you would have to establish also the equality relation
between functions and between infinite streams.
And you would end as Giordano Bruno and Jeanne d'Arc. But for different
reasons.
Jerzy Karczmarczuk
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