+ (multiple-value-bind (lines-used lines-total max-depth depth-limit)
+ (cache-statistics cache)
+ (format stream
+ "~D key~P, ~:[no value~;value~], ~D/~D lines, depth ~D/~D"
+ (cache-key-count cache)
+ (cache-key-count cache)
+ (cache-value cache)
+ lines-used
+ lines-total
+ max-depth
+ depth-limit))))