In a non-delivered LispWorks image, the form
(eq (symbol-name 'foo) (symbol-name 'foo)) evaluates to t . This behaviour is due to the way symbol names are cached. There is no requirement or guarantee that the results of successive calls to symbol-name be the same ( eq ) object.
After delivery, LispWorks symbol names are implemented differently such that the eq test above fails. Take care that your application does not rely on identity of symbol names.
Note: eq is not a reliable comparison of strings in general. Use equal for reliable string comparison.