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Configuring exchangerates-0.0.0.0...
Building exchangerates-0.0.0.0...
Failed to install exchangerates-0.0.0.0
Build log ( /home/builder/.cabal/logs/ghc-8.4.3/exchangerates-0.0.0.0-4olQor1TpIu6jSzuPZvNWS.log ):
cabal: Entering directory '/tmp/cabal-tmp-4301/exchangerates-0.0.0.0'
Configuring exchangerates-0.0.0.0...
Preprocessing library for exchangerates-0.0.0.0..
Building library for exchangerates-0.0.0.0..
[1 of 6] Compiling ExchangeRates.Types ( src/ExchangeRates/Types.hs, dist/build/ExchangeRates/Types.o )

src/ExchangeRates/Types.hs:86:5: error:
    ‘isValid’ is not a (visible) method of class ‘Validity’
   |
86 |     isValid = isValidByValidating
   |     ^^^^^^^

src/ExchangeRates/Types.hs:171:5: error:
    ‘isValid’ is not a (visible) method of class ‘Validity’
    |
171 |     isValid = isValidByValidating
    |     ^^^^^^^
cabal: Leaving directory '/tmp/cabal-tmp-4301/exchangerates-0.0.0.0'
cabal: Error: some packages failed to install:
exchangerates-0.0.0.0-4olQor1TpIu6jSzuPZvNWS failed during the building phase.
The exception was:
ExitFailure 1