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(define (read-line . o)
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(let ((port (if (pair? o) (car o) (current-input-port))))
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(let lp ((res '()))
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(let ((c (read-char port)))
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(cond
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[(and (eof-object? c) (null? res)) #f]
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[(or (eof-object? c) (eqv? c #\newline))
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(list->string (reverse res))]
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[else
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(lp (cons c res))])))))
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