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Building classy-prelude-0.12.8...
Failed to install classy-prelude-0.12.8
Build log ( /home/builder/.cabal/logs/classy-prelude-0.12.8.log ):
cabal: Entering directory '/tmp/cabal-tmp-23990/classy-prelude-0.12.8'
Configuring classy-prelude-0.12.8...
Building classy-prelude-0.12.8...
Preprocessing library classy-prelude-0.12.8...
[1 of 1] Compiling ClassyPrelude    ( ClassyPrelude.hs, dist/build/ClassyPrelude.o )

ClassyPrelude.hs:203:34: error:
    Module ‘Data.Sequences’ does not export ‘intercalate’

ClassyPrelude.hs:207:1: error:
    Failed to load interface for ‘Data.MinLen’
    Use -v to see a list of the files searched for.

ClassyPrelude.hs:208:1: error:
    Failed to load interface for ‘Data.ByteVector’
    Perhaps you meant Data.Vector (from vector-0.11.0.0)
    Use -v to see a list of the files searched for.

ClassyPrelude.hs:229:1: error:
    Failed to load interface for ‘Data.Textual.Encoding’
    Perhaps you meant
      Data.Text.Encoding (from text-1.2.2.1)
      Data.Text.Lazy.Encoding (from text-1.2.2.1)
    Use -v to see a list of the files searched for.

ClassyPrelude.hs:230:1: error:
    Failed to load interface for ‘Data.Sequences.Lazy’
    Perhaps you meant Data.Sequences (from mono-traversable-1.0.1)
    Use -v to see a list of the files searched for.
cabal: Leaving directory '/tmp/cabal-tmp-23990/classy-prelude-0.12.8'
Installed yesod-form-1.4.9
cabal: Error: some packages failed to install:
classy-prelude-0.12.8 failed during the building phase. The exception was:
ExitFailure 1
yesod-crud-0.1.7 depends on classy-prelude-0.12.8 which failed to install.