LOOP关键字列表

Question

有没有可以在LOOP宏中引入新子句的关键字列表？http://www.lispworks.com/documentation/lw51/CLHS/Body/m_loop.htm是提供信息的,但我仍然不清楚提供的语法中的哪些单词是字面关键字而不是生产名称,以及是否存在是一些只能在子句中出现的关键字,而不是引入新的子句.

Answer 1

他们来了.这些可以引入一个条款:

姓名条款

named

变量条款

initially finally for as with

主要条款

do collect collecting append
appending nconc nconcing into count
counting sum summing maximize return
maximizing minimize minimizing doing 
thereis always never if when
unless repeat while until

这些不引入条款

= and it else end from upfrom 
above below to upto downto downfrom 
in on then across being each the hash-key
hash-keys of using hash-value hash-values
symbol symbols present-symbol 
present-symbols external-symbol 
external-symbols fixnum float t nil of-type

但请注意,它是解析什么是关键字的解析.例如:

(loop for key in hash-values)

只有for和in是关键字.