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diff --git a/src/rva.lisp b/src/rva.lisp
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+(defpackage :rva
+  (:use :cl))
+
+(in-package :rva)
+
+(defparameter *version* "v0.1")
+
+(defun error-cli (message)
+  (format *error-output*
+	    "~a~%Usage:
+	risc_vector file
+Options:
+	--version, -v: print version information~%"
+	    message)
+  (sb-ext:exit :code 1))
+
+(defun main ()
+  (lex:stub)
+  (error-cli "foobar"))