     negations.forEach (m) ->
         if m[1] == ""
             if m[3] == ""
-                assert(relativeFilePath != m[2], "Negation violated.")
+                assert(relativeFilePath != m[2], "NV: Negation violated.")
             else
-                assert(not relativeFilePath.startsWith(m[2]), "Negation violated.")
+                assert(not relativeFilePath.startsWith(m[2]), "NV: Negation violated.")
         else
             if m[3] == ""
                 assert(not (
                     relativeFilePath.endsWith("/" + m[2]) or
                     relativeFilePath == m[2]
-                ), "Negation violated.")
+                ), "NV: Negation violated.")
             else
                 assert(not (
                     relativeFilePath.includes("/" + m[2]) or
                     relativeFilePath.startsWith(m[2])
-                ), "Negation violated.")
+                ), "NV: Negation violated.")
     rawCodeType = path.extname(filePath).substr(1) # strip the leading "."
     rawCode = fs.readFileSync(filePath, {encoding: "utf8"})
     baseDirectory = path.dirname(filePath)

            i++
        else if arg == "-n"
            negation = args[i + 1].match(/^((?:\*\/)?)([^*]+)(\*?)$/)
            assert(negation != null)
            negations.push(negation)
            i += 2
        else if arg in ["--version", "-v"]

        writeOutput()
catch ex
    console.error("Error: " + ex.message)
    process.exit(
        if ex.message.startsWith("NV: ")
            64
        else
            1
    )
