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T2846b.hs:5:11: error:
• Couldn't match expected type ‘a1’
with actual type ‘[Num a0 => a0]’
Cannot instantiate unification variable ‘a1’
with a type involving polytypes: [Num a0 => a0]
• In the first argument of ‘show’, namely
‘([1, 2, 3] :: [Num a => a])’
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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