CLHS: Section 6.1.1.2

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## 6.1.1.2 Loop Keywords

Loop keywords are not true keywords[1]; they are special symbols, recognized by name rather than object identity, that are meaningful only to the loop facility. A loop keyword is a symbol but is recognized by its name (not its identity), regardless of the packages in which it is accessible.

In general, loop keywords are not external symbols of the `COMMON-LISP` package, except in the coincidental situation that a symbol with the same name as a loop keyword was needed for some other purpose in Common Lisp. For example, there is a symbol in the `COMMON-LISP` package whose name is `"UNLESS"` but not one whose name is `"UNTIL"`.

If no loop keywords are supplied in a loop form, the Loop Facility executes the loop body repeatedly; see Section 6.1.1.1.1 (Simple Loop).

The following X3J13 cleanup issue, not part of the specification, applies to this section:

- JUN90-TRIVIAL-ISSUES:11

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