showErrorMessage (MustSpecifyVersionWithUpgrade elmVersion) =
    "I can only upgrade code to the latest Elm version.  To make sure I'm doing what you expect, you must also specify --elm-version=" ++ show elmVersion ++ " when you use --upgrade."
showErrorMessage (MustSpecifyVersionWithUpgrade elmVersion) =
    "I can only upgrade code to the latest Elm version.  To make sure I'm doing what you expect, you must also specify --elm-version=" ++ show elmVersion ++ " when you use --upgrade."
showErrorMessage (MustSpecifyVersionWithUpgrade elmVersion) =
    "I can only upgrade code to the latest Elm version.  To make sure I'm doing what you expect, you must also specify --elm-version=" ++ show elmVersion ++ " when you use --upgrade."