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T7594.hs:37:12: error:
• Could not deduce (b ~ IO ())
from the context: (:&:) c0 Real a
bound by a type expected by the context:
forall a. (:&:) c0 Real a => a -> b
at T7594.hs:37:12-16
Expected: a -> b
Actual: a -> IO ()
‘b’ is a rigid type variable bound by
the inferred type of bar2 :: b
at T7594.hs:37:1-19
• In the first argument of ‘app’, namely ‘print’
In the expression: app print q2
In an equation for ‘bar2’: bar2 = app print q2
• Relevant bindings include bar2 :: b (bound at T7594.hs:37:1)
Suggested fix: Consider giving ‘bar2’ a type signature
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