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PushedInAsGivens.hs:10:31: error:
• Could not deduce: a1 ~ a
from the context: F Int ~ [a1]
bound by the type signature for:
foo :: forall a1. (F Int ~ [a1]) => a1 -> Int
at PushedInAsGivens.hs:9:13-44
‘a1’ is a rigid type variable bound by
the type signature for:
foo :: forall a1. (F Int ~ [a1]) => a1 -> Int
at PushedInAsGivens.hs:9:13-44
‘a’ is a rigid type variable bound by
the inferred type of bar :: a -> (a, Int)
at PushedInAsGivens.hs:(9,1)-(11,20)
• In the expression: y
In the first argument of ‘length’, namely ‘[x, y]’
In the expression: length [x, y]
• Relevant bindings include
x :: a1 (bound at PushedInAsGivens.hs:10:17)
foo :: a1 -> Int (bound at PushedInAsGivens.hs:10:13)
y :: a (bound at PushedInAsGivens.hs:9:5)
bar :: a -> (a, Int) (bound at PushedInAsGivens.hs:9:1)
PushedInAsGivens.hs:11:15: error:
• Couldn't match type: F Int
with: [a]
arising from a use of ‘foo’
• In the expression: foo y
In the expression: (y, foo y)
In the expression:
let
foo :: (F Int ~ [a]) => a -> Int
foo x = length [...]
in (y, foo y)
• Relevant bindings include
y :: a (bound at PushedInAsGivens.hs:9:5)
bar :: a -> (a, Int) (bound at PushedInAsGivens.hs:9:1)
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