Resolving dependencies...
Configuring tdoc-0.3.0...
Building tdoc-0.3.0...
Preprocessing library tdoc-0.3.0...
[1 of 8] Compiling Text.TDoc.Core   ( Text/TDoc/Core.hs, dist/build/Text/TDoc/Core.o )

Text/TDoc/Core.hs:32:22:
    Illegal operator ‘IsAttributeOf’ in type ‘attr
                                              `IsAttributeOf` node’
      Use TypeOperators to allow operators in types

Text/TDoc/Core.hs:44:24:
    Illegal operator ‘IsChildOf’ in type ‘child `IsChildOf` father’
      Use TypeOperators to allow operators in types

Text/TDoc/Core.hs:70:22:
    Illegal operator ‘IsChildOf’ in type ‘a `IsChildOf` b’
      Use TypeOperators to allow operators in types

Text/TDoc/Core.hs:111:22:
    Illegal operator ‘IsChildOf’ in type ‘b `IsChildOf` a’
      Use TypeOperators to allow operators in types

Text/TDoc/Core.hs:133:26:
    Illegal operator ‘IsChildOf’ in type ‘child `IsChildOf` node’
      Use TypeOperators to allow operators in types

Text/TDoc/Core.hs:137:35:
    Illegal operator ‘IsChildOf’ in type ‘child `IsChildOf` node’
      Use TypeOperators to allow operators in types

Text/TDoc/Core.hs:148:12:
    Illegal operator ‘IsChildOf’ in type ‘a `IsChildOf` b’
      Use TypeOperators to allow operators in types
Failed to install tdoc-0.3.0
cabal: Error: some packages failed to install:
tdoc-0.3.0 failed during the building phase. The exception was:
ExitFailure 1