File: RecordType.shell-protocol

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haskell-getopt-generics 0.13.1.0-2
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$ program --port 8080 --config some/path
Options {port = 8080, daemonize = False, config = Just "some/path"}
$ program  --port 8080 --daemonize
Options {port = 8080, daemonize = True, config = Nothing}
$ program --port foo
cannot parse as INTEGER: foo
# exit-code 1
$ program
missing option: --port=INTEGER
# exit-code 1
$ program --help
program [OPTIONS]
      --port=INTEGER
      --daemonize
      --config=STRING (optional)
  -h  --help                      show help and exit