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I have been wondering what is the use of '&' symbol.
For example ...
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(defun abc ( attr goal &opt prior &aux (tree nil) )
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Sorry for not replying earlier. In Lisp, "&word" is not the symbol "&" followed by "word", it is actually a single symbol name. The "&" has no special significance to the compiler; it is just something that stands out to the human reader.
Here's a list of common naming conventions. http://www.cliki.net/naming%20conventions
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