Warning: The install command is a part of the legacy v1 style of cabal usage.

Please switch to using either the new project style and the new-install
command or the legacy v1-install alias as new-style projects will become the
default in the next version of cabal-install. Please file a bug if you cannot
replicate a working v1- use case with the new-style commands.

For more information, see: https://wiki.haskell.org/Cabal/NewBuild

Resolving dependencies...
Starting     megaparsec-4.4.0
Building     megaparsec-4.4.0
Completed    megaparsec-4.4.0
Starting     nmis-parser-0.1.0.2
Building     nmis-parser-0.1.0.2
Failed to install nmis-parser-0.1.0.2
Build log ( /home/builder/.cabal/logs/ghc-8.6.1/nmis-parser-0.1.0.2-L6EDu7oA7DZ22IdMs4x2tt.log ):
cabal: Entering directory '/tmp/cabal-tmp-23320/nmis-parser-0.1.0.2'
Configuring nmis-parser-0.1.0.2...
Preprocessing library for nmis-parser-0.1.0.2..
Building library for nmis-parser-0.1.0.2..
[1 of 3] Compiling Text.Internal.Helper ( src/Text/Internal/Helper.hs, dist/build/Text/Internal/Helper.o )

src/Text/Internal/Helper.hs:61:27: error:
    Not in scope: type constructor or class ‘Dec’
   |
61 | until :: String -> Parsec Dec String String
   |                           ^^^

src/Text/Internal/Helper.hs:65:20: error:
    Not in scope: type constructor or class ‘Dec’
   |
65 | untilEol :: Parsec Dec String String
   |                    ^^^
cabal: Leaving directory '/tmp/cabal-tmp-23320/nmis-parser-0.1.0.2'
cabal: Error: some packages failed to install:
nmis-parser-0.1.0.2-L6EDu7oA7DZ22IdMs4x2tt failed during the building phase.
The exception was:
ExitFailure 1