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May 23, 2016 17:35
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anaphoric macro
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| (define-syntax (aif stx) | |
| (syntax-case stx () | |
| [(_ expr then else) | |
| (with-syntax ([it (datum->syntax stx 'it)] ) | |
| #'(let ((it expr)) | |
| (if it then else)))])) |
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