ghci

The Glasgow Haskell Compiler's interactive environment. More information: https://downloads.haskell.org/ghc/latest/docs/html/users_guide/ghci.html.

• Start a REPL (interactive shell):
  ghci
• Start a REPL and load the specified Haskell source file:
  ghci {{source_file.hs}}
• Start a REPL and enable a language option:
  ghci -X{{language_option}}
• Start a REPL and enable some level of compiler warnings (e.g. all or compact):
  ghci -W{{warning_level}}
• Start a REPL with a colon-separated list of directories for finding source files:
  ghci -i{{path/to/directory1}}:{{path/to/directory2}}