[Haskell-cafe] typeclass constraint question

[Jeff Polakow]

Hello,

I'm trying to understand what happens when a typeclass constraint with an 
uninstantiated type variable gets duplicated. 
Does the type checker treat the separate copies of the constraint as two 
constraints (with the same type variable) which are checked separately?
Or does the type checker only consider one constraint which is checked 
(simultaneously) in different contexts?
Also does it matter if the constraints are on datatype, or even gadt, 
constructors rather than functions?

thanks,
  Jeff


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