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Configuring rfc-0.0.0.18...
Building rfc-0.0.0.18...
Failed to install rfc-0.0.0.18
Build log ( /home/builder/.cabal/logs/ghc-8.2.2/rfc-0.0.0.18-7Vr4QS3MaD7CcJzW9rbNcq.log ):
cabal: Entering directory '/tmp/cabal-tmp-14853/rfc-0.0.0.18'
Configuring rfc-0.0.0.18...
Preprocessing library for rfc-0.0.0.18..
Building library for rfc-0.0.0.18..
[ 1 of 15] Compiling RFC.HTTP.Types   ( src/RFC/HTTP/Types.hs, dist/build/RFC/HTTP/Types.o )
[ 2 of 15] Compiling RFC.Miso.String  ( src/RFC/Miso/String.hs, dist/build/RFC/Miso/String.o )

src/RFC/Miso/String.hs:17:30: error:
    Duplicate instance declarations:
      instance [overlapping] ConvertibleStrings MisoString MisoString
        -- Defined at src/RFC/Miso/String.hs:17:30
      instance [safe] ConvertibleStrings StrictText StrictText
        -- Defined in ‘Data.String.Conversions’
   |
17 | instance {-# OVERLAPPING #-} ConvertibleStrings MisoString MisoString where
   |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cabal: Leaving directory '/tmp/cabal-tmp-14853/rfc-0.0.0.18'
cabal: Error: some packages failed to install:
rfc-0.0.0.18-7Vr4QS3MaD7CcJzW9rbNcq failed during the building phase. The
exception was:
ExitFailure 1