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T14546d.hs:3:10: warning: [-Wmissing-methods (in -Wdefault)]
• No explicit implementation for
‘+’, ‘*’, ‘abs’, ‘signum’, and (either ‘negate’ or ‘-’)
• In the instance declaration for ‘Num D’
T14546d.hs:7:5: warning: [-Wincomplete-patterns (in -Wextra)]
Pattern match(es) are non-exhaustive
In a case alternative: Patterns of type ‘D’ not matched: 3
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