On 9 Apr 2013, at 14:46, Sturdy, Ian wrote:
> As far as the use of Eq goes, Eq is already enshrined in pattern matching by
> pattern matching against literals.
Not true. Pattern-matching literals explicitly avoids any use of Eq.
Demonstration:
data Foo = Foo | Bar
instance Eq Foo where
_ == _ = True
isFoo Foo = True
isFoo Bar = False
main = do print (isFoo Bar)
print (Foo==Bar)
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