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Task/Metaprogramming/Racket/metaprogramming-2.rkt
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Task/Metaprogramming/Racket/metaprogramming-2.rkt
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(require (for-syntax syntax/parse))
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(define-syntax list-when
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(syntax-parser
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[(_ test:expr body:expr)
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#'(if test
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body
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null)]))
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