Subject: Re: `loop' and arrays
From: Erik Naggum <>
Date: 1998/08/02
Newsgroups: comp.lang.lisp
Message-ID: <>

* Marco Antoniotti
| CLtL2 and ANSI warn against changing the structure being iterated over.
| You are asking for trouble.

  hm?  the relevant warnings explicitly allow changing the values without
  changing the structure.  if you traverse a list, you can change the CARs,
  but not the CDRs.  if you traverse a hash table, you can change the value
  for the given key, even delete it, but not any others.  etc.  it's kind
  of hard to change the structure of a vector you're traversing, though.

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