Simon Peyton-Jones wrote:
(A) data RecContTest a where
Show a => C { showable :: Show a => a } :: RecContTest a
(B) data RecContTest a where
C :: Show a => { showable :: Show a => a } -> RecContTest a
What about
(A') data RecContTest a where
Show a => C { showable :: a } :: RecContTest a
(B') data RecContTest a where
C :: Show a => { showable :: a } -> RecContTest a
? Would this be allowed?
I would expect A' and B' to generate
showable :: RecContTest a -> a
and not the less useful (Show-requiring)
showable :: Show a => RecContTest a -> a
Zun.
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