如何使用 windows 的 powershell 运行 Haskell 文件？

Question

I downloaded chocolatey and am able to load up ghci and get prelude on powershell . I then cd into the directory where I have a haskell file I want to run, then I type ghci and then type:

load haskellprogram.hs

but then I get an error about it not being in scope. Is this not how you run a Haskell program?

Answer 1

The GHCi command to load a file is :load , not load . You should write:

:load haskellprogram.hs

The command can also be abbreviated :l . You can find more information about the available commands in GHCi by entering :help . Also note that the prompt shows the modules you have imported; Prelude is just the name of the standard library module that gets imported by default. You can change the prompt with:

:set prompt "> "
:set prompt-cont "| "

(Where prompt-cont is the prompt for multi-line input, using the commands :{ and :} or the multi-line input mode enabled by :set +m .)

When you entered load haskellprogram.hs , it was interpreted as a Haskell expression: (load haskellprogram) . hs (load haskellprogram) . hs , which tries to use the (.) composition operator and three variables load , haskellprogram , and hs that are not defined.