本文探讨了通过语法扩展器处理抽象语法的过程。当遇到抽象语法时，扩展器会调用相应的转换器进行展开，然后对返回的形式重复展开过程。对于核心形式，它递归地处理表达式或定义上下文中的子形式，并在扩展后重构形式。在展开过程中维护标识符绑定信息，以确保变量和关键字的词法作用域。
I need a good sleep.
Macro uses by a syntax expander. The set of core forms is implementation-dependent, as is the representation of
these forms in the expander’soutput. If the expander encounters a syntactic abstraction, it invokes the associated
transformer to expand the syntactic abstraction, then repeats the expansion process for the form returned by the
transformer. If the expander encounters a core form, it recursively processes its subforms that are in expression or
definition context, if any, and reconstructs the form from the expanded subforms. Information about identifier bind-
ings is maintained during expansion to enforce lexical scoping for variables and keywords.
Macro uses by a syntax expander. The set of core forms is implementation-dependent, as is the representation of
these forms in the expander’soutput. If the expander encounters a syntactic abstraction, it invokes the associated
transformer to expand the syntactic abstraction, then repeats the expansion process for the form returned by the
transformer. If the expander encounters a core form, it recursively processes its subforms that are in expression or
definition context, if any, and reconstructs the form from the expanded subforms. Information about identifier bind-
ings is maintained during expansion to enforce lexical scoping for variables and keywords.
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