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16 lines
507 B
Scheme
16 lines
507 B
Scheme
(define-library (test-lib test)
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(import (scheme base))
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(export
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my-or)
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(begin
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(define-syntax my-or
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(er-macro-transformer
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(lambda (expr rename compare)
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(cond ((null? (cdr expr)) #f)
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((null? (cddr expr)) (cadr expr))
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(else
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(list (rename 'let) (list (list (rename 'tmp) (cadr expr)))
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(list (rename 'if) (rename 'tmp)
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(rename 'tmp)
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(cons (rename 'or) (cddr expr)))))))))
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))
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