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#lang racket/base
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(provide (all-defined-out))
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(define (to-string x)
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(cond
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[(string? x) x]
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[(or (null? x) (void? x)) ""]
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[(or (symbol? x) (number? x) (path? x) (char? x)) (format "~a" x)]
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[else (format "~v" x)])) |