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Scheme lisp 是否提供任何库。类似于 perl“严格”变量声明?
与 Perl 相比,Scheme 一开始就非常严格和干净(例如,在大多数实现中引用未声明的变量会引发异常)。编译时警告是一个实现质量问题。您正在使用哪种方案实现?