Resolving dependencies...
Configuring extensible-exceptions-0.1.1.4...
Configuring mtl-2.2.1...
Building extensible-exceptions-0.1.1.4...
Building mtl-2.2.1...
Configuring random-1.1...
Installed extensible-exceptions-0.1.1.4
Building random-1.1...
Configuring text-1.2.2.1...
Installed mtl-2.2.1
Building text-1.2.2.1...
Configuring regex-base-0.93.2...
Installed random-1.1
Building regex-base-0.93.2...
Installed regex-base-0.93.2
Configuring regex-posix-0.95.2...
Building regex-posix-0.95.2...
Installed regex-posix-0.95.2
Configuring regex-compat-0.95.1...
Building regex-compat-0.95.1...
Installed regex-compat-0.95.1
Installed text-1.2.2.1
Configuring polyparse-1.12...
Configuring text-icu-0.7.0.1...
Building polyparse-1.12...
Building text-icu-0.7.0.1...
Installed polyparse-1.12
Configuring HaXml-1.23.3...
Building HaXml-1.23.3...
Installed text-icu-0.7.0.1
Configuring stringprep-1.0.0...
Building stringprep-1.0.0...
Installed stringprep-1.0.0
Installed HaXml-1.23.3
Configuring encoding-0.6.7.1...
Failed to install encoding-0.6.7.1
Build log ( /home/builder/.cabal/logs/encoding-0.6.7.1.log ):
cabal: Entering directory '/tmp/cabal-tmp-16011/encoding-0.6.7.1'
cabal: Leaving directory '/tmp/cabal-tmp-16011/encoding-0.6.7.1'
cabal: Error: some packages failed to install:
encoding-0.6.7.1 failed during the configure step. The exception was:
user error ('/opt/ghc/8.0.2/bin/ghc' exited with an error:

/tmp/cabal-tmp-16011/encoding-0.6.7.1/Data/Static.hs:39:28: error:
• Couldn't match expected type ‘Bool’ with actual type ‘Int#’
• In the expression: eqWord# v (int2Word# 4294967295#)
In the expression:
if eqWord# v (int2Word# 4294967295#) then
Nothing
else
(if (I# (word2Int# v)) > 1114111 then
error
(show (I# (word2Int# v))
++ " is not a valid char (" ++ show (I# i) ++ ")")
else
Just (chr (I# (word2Int# v))))
In the expression:
let !v = indexWord32OffAddr# addr i
in
if eqWord# v (int2Word# 4294967295#) then
Nothing
else
(if (I# (word2Int# v)) > 1114111 then
error
(show (I# (word2Int# v))
++ " is not a valid char (" ++ show (I# i) ++ ")")
else
Just (chr (I# (word2Int# v))))
)
idna-0.1.1 depends on encoding-0.6.7.1 which failed to install.