On 7 Apr 2008, at 21:15, Dan Weston wrote:
To answer your second question (which everyone else ignored):
Yes. A different keyword might have been more descriptive, such as
"automatically_deriving_instances_for".
They are called instantiations, which Haskell can supply
automatically in some cases. And there is already a keyword
"instance" for that - in general, it is good to keep down the number
of keywords. So
data Bool = False | True
instance (Eq, Ord, Enum, Read, Show, Bounded)
might have been better.
But here, one would have to think about how the compiler should be
able to distinguish
data Bool = False | True
instance (Eq)
from
data Bool = False | True
instance Eq Bool where
x == y = ...
One wants to be able to do that with as little lookahead as possible.
Hans Aberg
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