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Problems with (open



Does anyone know why this does not work?

? (setf a (open "test" :direction :io :if-exists :overwrite
                :element-type :unsigned-byte))
> Error: Unbound variable: UNSIGNED-BYTE
> While executing: SYMBOL-VALUE
> Type Command-/ to continue, Command-. to abort.
> If continued: Retry getting the value of UNSIGNED-BYTE.
See the Restarts... menu item for further choices.
1 > 
Aborted
? (setf a (open "test" :direction :io :if-exists :overwrite
                :element-type unsigned-byte))
> Error: Unbound variable: UNSIGNED-BYTE
> While executing: SYMBOL-VALUE
> Type Command-/ to continue, Command-. to abort.
> If continued: Retry getting the value of UNSIGNED-BYTE.
See the Restarts... menu item for further choices.
1 >