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<interactive>:11:1: error:
Unsafe overlapping instances for Pos [Int]
arising from a use of ‘res’
The matching instance is:
instance [overlapping] [safe] Pos [Int]
-- Defined at <interactive>:9:30
It is compiled in a Safe module and as such can only
overlap instances from the same module, however it
overlaps the following instances from different modules:
instance [safe] Pos [a] -- Defined at P13_A.hs:6:10
In the expression: res [1 :: Int, 2 :: Int]
In an equation for ‘it’: it = res [1 :: Int, 2 :: Int]
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