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tcfail019.hs:18:10: error:
• No instance for (B [a])
arising from the superclasses of an instance declaration
• In the instance declaration for ‘D [a]’
tcfail019.hs:18:10: error:
• No instance for (C [a])
arising from the superclasses of an instance declaration
• In the instance declaration for ‘D [a]’
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