Common Lisp: Difference between revisions

Revision as of 14:52, 1 March 2006

Revision as of 14:07, 10 March 2006

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Some Lisp systems, such as Scheme, avoid variable capture by using macro syntax — so-called "hygienic macros" — that does not allow it. In Common Lisp, one can usually avoid unwanted capture by using [[gensym]]s: guaranteed-unique symbols which can be used in a macro-expansion without threat of capture.

Another issue is the inadvertantinadvertent ''shadowing of operators'' used in a macroexpansion. For example, consider the following (incorrect) code:

(macrolet ((do (...) ... something else ...))