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#lang racket/base
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(require (for-syntax racket/base racket/syntax))
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(provide report)
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(define-syntax (report stx)
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(syntax-case stx ()
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[(_ expr) #'(report expr expr)]
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[(_ expr name)
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#'(begin
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(displayln (format "~a = ~v" 'name expr) (current-error-port))
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expr)])) |