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T2664.hs:31:52:
Could not deduce (b ~ a)
from the context (Connect a, Connect b)
bound by the instance declaration at T2664.hs:22:10-52
or from ((a :*: b) ~ Dual c, c ~ Dual (a :*: b))
bound by the type signature for
newPChan :: ((a :*: b) ~ Dual c, c ~ Dual (a :*: b)) =>
IO (PChan (a :*: b), PChan c)
at T2664.hs:23:5-12
‛b’ is a rigid type variable bound by
the instance declaration at T2664.hs:22:10
‛a’ is a rigid type variable bound by
the instance declaration at T2664.hs:22:10
Expected type: Dual (Dual a)
Actual type: b
Relevant bindings include
newPChan :: IO (PChan (a :*: b), PChan c) (bound at T2664.hs:23:5)
v :: MVar (Either (PChan a) (PChan b)) (bound at T2664.hs:24:9)
In the third argument of ‛pchoose’, namely ‛newPChan’
In the first argument of ‛E’, namely ‛(pchoose Right v newPChan)’
In the expression:
E (pchoose Right v newPChan) (pchoose Left v newPChan)
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