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Expansion Time Binding and Evaluation

Expansion time is the time at which macro and identifier macro definition values are evaluated and macro procedures are invoked. Macros, identifier macros, and primitive syntax are expansion-time values. General expansion-time values can be defined with the define-expansion-time and let-expansion-time syntactic forms. Scoped expansion-time bindings can be obtained with local-expansion-time-value or global-expansion-time-value, and scoping information is available through local-expansion-time-bound?.


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