6.10.2.3 Shorthands

One often ends up writing simple one-clause syntax-rules macros. There is a convenient shorthand for this idiom, in the form of define-syntax-rule.

Syntax: define-syntax-rule (keyword . pattern) [docstring] template

Define keyword as a new syntax-rules macro with one clause.

Cast into this form, our when example is significantly shorter:

(define-syntax-rule (when c e ...)
  (if c (begin e ...)))

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