我可以用cabal构建并运行一个简单的Haskell程序

module Main where
import System.Environment ( getArgs )
main :: IO ()
main = do

   -- (input:_:_) <- getArgs
   print "Hello Oren"

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当 no arguments 被期望时，一切都很好：

$ cabal build 1>/dev/null 2>/dev/null
$ cabal run
Up to date
"Hello Oren"

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似乎可以将参数传递给程序：

$ cabal run --help | sed -n '13,16p'
Extra arguments can be passed to the program, but use '--' to separate
arguments for the program from arguments for cabal. The executable is run in
an environment where it can find its data files inplace in the build tree.

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但是，我似乎无法让它工作：

$ cabal run -- Oren 13 10              
cabal: Cannot run the package Oren, it is not in this project (either directly
or indirectly). If you want to add it to the project then edit the
cabal.project file.

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