Resolving dependencies...
Configuring call-stack-0.1.0...
Configuring mtl-2.2.1...
Building call-stack-0.1.0...
Building mtl-2.2.1...
Installed call-stack-0.1.0
Configuring syb-0.6...
Building syb-0.6...
Configuring HUnit-1.5.0.0...
Installed mtl-2.2.1
Building HUnit-1.5.0.0...
Configuring text-1.2.2.1...
Installed syb-0.6
Building text-1.2.2.1...
Configuring haskell-src-1.0.2.0...
Installed HUnit-1.5.0.0
Building haskell-src-1.0.2.0...
Installed haskell-src-1.0.2.0
Installed text-1.2.2.1
Configuring parsec-3.1.11...
Building parsec-3.1.11...
Installed parsec-3.1.11
Configuring DocTest-0.0.2...
Building DocTest-0.0.2...
Failed to install DocTest-0.0.2
Build log ( /home/builder/.cabal/logs/DocTest-0.0.2.log ):
cabal: Entering directory '/tmp/cabal-tmp-23348/DocTest-0.0.2'
Configuring DocTest-0.0.2...
Building DocTest-0.0.2...
Preprocessing executable 'doctest' for DocTest-0.0.2...
[1 of 5] Compiling Test.DocTest.Util ( Test/DocTest/Util.hs, dist/build/doctest/doctest-tmp/Test/DocTest/Util.o )

Test/DocTest/Util.hs:14:1: warning: [-Wtabs]
    Tab character found here, and in 8 further locations.
    Please use spaces instead.
[2 of 5] Compiling Test.DocTest.Error ( Test/DocTest/Error.hs, dist/build/doctest/doctest-tmp/Test/DocTest/Error.o )

Test/DocTest/Error.hs:9:1: warning: [-Wtabs]
    Tab character found here, and in five further locations.
    Please use spaces instead.
[3 of 5] Compiling Test.DocTest     ( Test/DocTest.hs, dist/build/doctest/doctest-tmp/Test/DocTest.o )

Test/DocTest.hs:12:1: warning: [-Wtabs]
    Tab character found here, and in 20 further locations.
    Please use spaces instead.
[4 of 5] Compiling Test.DocTest.Parser ( Test/DocTest/Parser.hs, dist/build/doctest/doctest-tmp/Test/DocTest/Parser.o )

Test/DocTest/Parser.hs:13:1: warning: [-Wtabs]
    Tab character found here, and in 65 further locations.
    Please use spaces instead.
[5 of 5] Compiling Main             ( Main.hs, dist/build/doctest/doctest-tmp/Main.o )

Main.hs:23:19: error:
    • Variable not in scope:
        catch :: IO FilePath -> (t0 -> m0 [Char]) -> IO FilePath
    • Perhaps you want to add ‘catch’ to the import list
      in the import of ‘Control.Exception’ (Main.hs:6:1-33).
cabal: Leaving directory '/tmp/cabal-tmp-23348/DocTest-0.0.2'
cabal: Error: some packages failed to install:
DocTest-0.0.2 failed during the building phase. The exception was:
ExitFailure 1