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#lang racket
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(provide bound/c (rename-out (top~ #%top)))
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(define-syntax-rule (top~ . id)
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(λ x `(id ,@x)))
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(define-syntax (bound/c stx)
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(syntax-case stx ()
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[(_ x)
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(if (identifier-binding #'x )
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#'x
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#'(#%top . x))]))
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