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 HUnit-1.5.0.0...
Building HUnit-1.5.0.0...
Installed mtl-2.2.1
Installed HUnit-1.5.0.0
Configuring regexpr-0.1.7...
Failed to install regexpr-0.1.7
Build log ( /home/builder/.cabal/logs/regexpr-0.1.7.log ):
cabal: Entering directory '/tmp/cabal-tmp-12700/regexpr-0.1.7'
cabal: Leaving directory '/tmp/cabal-tmp-12700/regexpr-0.1.7'
cabal: Error: some packages failed to install:
regexpr-0.1.7 failed during the configure step. The exception was:
user error ('/opt/ghc/8.0.2/bin/ghc' exited with an error:

/tmp/cabal-tmp-12700/regexpr-0.1.7/Hidden/ParseLib.hs:6:16: warning:
-fglasgow-exts is deprecated: Use individual extensions instead

/tmp/cabal-tmp-12700/regexpr-0.1.7/Hidden/ParseLib.hs:7:16: warning:
-fallow-undecidable-instances is deprecated: use -XUndecidableInstances or
pragma {-# LANGUAGE UndecidableInstances #-} instead

/tmp/cabal-tmp-12700/regexpr-0.1.7/Hidden/ParseLibCore.hs:6:16: warning:
-fglasgow-exts is deprecated: Use individual extensions instead

/tmp/cabal-tmp-12700/regexpr-0.1.7/Hidden/ParseLibCore.hs:7:16: warning:
-fallow-undecidable-instances is deprecated: use -XUndecidableInstances or
pragma {-# LANGUAGE UndecidableInstances #-} instead

/tmp/cabal-tmp-12700/regexpr-0.1.7/Hidden/ParseLibCore.hs:81:10: error:
• No instance for (Applicative (Parse a))
arising from the superclasses of an instance declaration
• In the instance declaration for ‘Monad (Parse a)’

/tmp/cabal-tmp-12700/regexpr-0.1.7/Hidden/ParseLibCore.hs:86:10: error:
• No instance for (GHC.Base.Alternative (Parse a))
arising from the superclasses of an instance declaration
• In the instance declaration for ‘MonadPlus (Parse a)’
)