Christophe Rhodes  <csr21@cam.ac.uk> wrote:
+---------------
| "Karsten Poeck" <karsten.poeck.nadadespam@wanadoo.es> writes:
| > In cl-http there are a lot of uses of loop in the following style
| > (simplified)
| > (loop with idx = 0 and end = 3
| >    while (< idx end)
| >    for char = (aref "012" idx)
| >    do (print char)(incf idx))
| >
| > Is the above pattern indeed incorrect?
| 
| I believe so.
+---------------

Yup, incorrect. From CLHS "Macro LOOP" <URL:http://www.lispworks.com/
reference/HyperSpec/Body/m_loop.htm>:

    loop [name-clause] {variable-clause}* {main-clause}* => result*
    ...
    variable-clause::= with-clause | initial-final | for-as-clause 
    ...
    main-clause::= unconditional | accumulation | conditional |
                   termination-test | initial-final
    ...
    termination-test::= while form | until form | repeat form |
			always form | never form | thereis form

Therefore all FOR (and WITH) clauses must precede all WHILE clauses.


-Rob

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Rob Warnock			<rpw3@rpw3.org>
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