Resolving dependencies...
Starting     parser-combinators-1.3.0
Starting     hashable-1.3.2.0
Starting     primitive-0.7.2.0
Starting     integer-logarithms-1.0.3.1
Building     hashable-1.3.2.0
Building     parser-combinators-1.3.0
Building     integer-logarithms-1.0.3.1
Building     primitive-0.7.2.0
Completed    integer-logarithms-1.0.3.1
Completed    parser-combinators-1.3.0
Completed    hashable-1.3.2.0
Starting     case-insensitive-1.2.1.0
Building     case-insensitive-1.2.1.0
Completed    case-insensitive-1.2.1.0
Completed    primitive-0.7.2.0
Starting     scientific-0.3.7.0
Building     scientific-0.3.7.0
Completed    scientific-0.3.7.0
Starting     megaparsec-9.0.1
Building     megaparsec-9.0.1
Completed    megaparsec-9.0.1
Starting     lambda-cube-0.1.0.0
Building     lambda-cube-0.1.0.0
Failed to install lambda-cube-0.1.0.0
Build log ( /home/builder/.cabal/logs/ghc-8.10.2/lambda-cube-0.1.0.0-3uUGyQ3zKCkEwB6rZvdikW.log ):
cabal: Entering directory '/tmp/cabal-tmp-2076/lambda-cube-0.1.0.0'
Configuring lambda-cube-0.1.0.0...
Preprocessing library for lambda-cube-0.1.0.0..
Building library for lambda-cube-0.1.0.0..
[ 1 of 35] Compiling LambdaCube.Common.Parser ( src/LambdaCube/Common/Parser.hs, dist/build/LambdaCube/Common/Parser.o, dist/build/LambdaCube/Common/Parser.dyn_o )
[ 2 of 35] Compiling LambdaCube.Common.PrettyPrinter ( src/LambdaCube/Common/PrettyPrinter.hs, dist/build/LambdaCube/Common/PrettyPrinter.o, dist/build/LambdaCube/Common/PrettyPrinter.dyn_o )
[ 3 of 35] Compiling LambdaCube.STLC.Ast ( src/LambdaCube/STLC/Ast.hs, dist/build/LambdaCube/STLC/Ast.o, dist/build/LambdaCube/STLC/Ast.dyn_o )

src/LambdaCube/STLC/Ast.hs:10:29: error:
    " No instance for (Lift Text)
        arising from the first field of ExtLCVar (type Text)
      Possible fix:
        use a standalone 'deriving instance' declaration,
          so you can specify the instance context yourself
    " When deriving the instance for (Lift ExtLCTerm)
   |
10 |   deriving stock (Eq, Show, Lift)
   |                             ^^^^
cabal: Leaving directory '/tmp/cabal-tmp-2076/lambda-cube-0.1.0.0'
cabal: Error: some packages failed to install:
lambda-cube-0.1.0.0-3uUGyQ3zKCkEwB6rZvdikW failed during the building phase.
The exception was:
ExitFailure 1