修改记录参数时出现REPL错误

考虑 shell :: String -> CreateProcess .例如:

Prelude System.IO System.Process> shell "pwd"
CreateProcess {cmdspec = ShellCommand "pwd", cwd = Nothing, env = Nothing, std_in = Inherit, std_out = Inherit, std_err = Inherit, close_fds = False, create_group = False, delegate_ctlc = False, detach_console = False, create_new_console = False, new_session = False, child_group = Nothing, child_user = Nothing, use_process_jobs = False}

我正试图修改 CreateProcess ,但收到REPL错误:

Prelude System.IO System.Process> shell "pwd" { cwd = "/home" }

<interactive>:7:7: error:
    • Couldn't match type ‘CreateProcess’ with ‘[Char]’
      Expected type: String
        Actual type: CreateProcess
    • In the first argument of ‘shell’, namely ‘"pwd" {cwd = "/home"}’
      In the expression: shell "pwd" {cwd = "/home"}
      In an equation for ‘it’: it = shell "pwd" {cwd = "/home"}

<interactive>:7:21: error:
    • Couldn't match expected type ‘Maybe FilePath’
                  with actual type ‘[Char]’
    • In the ‘cwd’ field of a record
      In the first argument of ‘shell’, namely ‘"pwd" {cwd = "/home"}’
      In the expression: shell "pwd" {cwd = "/home"}