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T9017.hs:8:7: error: [GHC-25897]
• Couldn't match kind ‘k2’ with ‘*’
When matching types
a0 :: * -> * -> *
a :: k1 -> k2 -> *
Expected: a b (m b)
Actual: a0 b0 (m0 b0)
‘k2’ is a rigid type variable bound by
the type signature for:
foo :: forall {k1} {k2} (a :: k1 -> k2 -> *) (b :: k1)
(m :: k1 -> k2).
a b (m b)
at T9017.hs:7:1-16
• In the expression: arr return
In an equation for ‘foo’: foo = arr return
• Relevant bindings include
foo :: a b (m b) (bound at T9017.hs:8:1)
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