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The function declaration-env.policy returns the optimize qualities that are stored in declaration-env.
PARSE-DECLARATIONS> (declaration-env.policy (parse-declarations
'((declare (optimize (speed 0) (debug 2)))
(declare (fixnum x y))
(declare (inline +))
(declae (optimize (safety 3))))))
=> ((SAFETY 3) (SPEED 0) (DEBUG 2))
Signals an error of type TYPE-ERROR if
declaration-env is not a declaration-env.