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/usr/lib/mlton/include/util/to-string.h is in mlton-basis 20100608-5.1.

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/* Copyright (C) 2004-2008 Henry Cejtin, Matthew Fluet, Suresh
 *    Jagannathan, and Stephen Weeks.
 *
 * MLton is released under a BSD-style license.
 * See the file MLton-LICENSE for details.
 */

PRIVATE const char* boolToString (bool b);
PRIVATE char* intmaxToCommaString (intmax_t n);
PRIVATE char* uintmaxToCommaString (uintmax_t n);