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MLton is a whole-program optimizing Standard ML compiler that supports the full SML 97 language. Features include a complete basis library (except for use) matching the 2002 specs, untagged native integers and reals, unboxed native arrays, fast C FFI, multiple garbage collection strategies (copying, mark contact, generational), source-level profiling of both time and allocation, and a fast IntInf based on GNUmp. It also includes libraries for continuations, finalization, heap save and restore, interval timers, random numbers, resource limits, resource usage, signal handlers, system logging, threads, weak pointers.


User guide available in HTML format from

"IRC irc:// " IRC development channel


Download version 20041109 (stable)
released on 9 November 2004

VCS Checkout co mlton



LicenseVerified byVerified onNotes
SimplePermissiveNonWarrantyJanet Casey14 August 2003

Leaders and contributors

See for a complete list of contributors Contributor
Stephen Weeks Maintainer

Resources and communication

Audience Resource type URI
Support E-mail
Bug Tracking,Developer E-mail
Developer VCS Repository Webview

Software prerequisites

This entry (in part or in whole) was last reviewed on 16 May 2005.


Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.

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