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SimpleFail5a.hs:31:11: error:
• Couldn't match type ‘a’ with ‘Int’
Expected: S3 a
Actual: S3 Int
‘a’ is a rigid type variable bound by
the type signature for:
bar3wrong :: forall a. S3 a -> a
at SimpleFail5a.hs:30:1-22
• In the pattern: D3Int
In an equation for ‘bar3wrong’: bar3wrong D3Int = 1
• Relevant bindings include
bar3wrong :: S3 a -> a (bound at SimpleFail5a.hs:31:1)
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