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T2846b.hs:5:5: error:
• No instance for (Show (Num a0 => a0))
arising from a use of ‘show’
(maybe you haven't applied a function to enough arguments?)
• In the expression: show ([1, 2, 3] :: [Num a => a])
In an equation for ‘f’: f = show ([1, 2, 3] :: [Num a => a])
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