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<title>
HOLTrace: ML REPL</title>
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HOLTrace</div>
<div class="navt away"><a href=index.html>Intro</a>
</div><div class="navt away"><a href=download.html>Download</a>
</div><div class="navt away"><a href=install.html>Install</a>
</div><div class="navt away"><a href=test.html>Test</a>
</div><div class="navt away"><a href=save.html>Save</a>
</div><div class="navt away"><a href=prune.html>Prune</a>
</div><div class="navt away"><a href=verify.html>Verify</a>
</div><div class="navt away"><a href=tex.html>TeX</a>
</div><div class="navt here">ML REPL
</div><div class="navt away"><a href=prooftrace.html>ProofTrace</a>
</div><div class="navt away"><a href=format.html>Format</a>
</div><div class="navt away"><a href=license.html>License</a>
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<div class=pagetitle>HOLTrace: ML REPL</div>
<p>The command-line tool <code>holtrace2ml</code>
takes a trace on standard output
and prints OCaml commands on standard output.
The OCaml commands are essentially a series of HOL Light kernel calls,
and if they are provided as input to HOL Light
then they will verify proofs similarly to
<a href="verify.html"><code>holtrace_restore</code></a>,
while printing out each lemma
(not just the named theorems).
These commands will also check definitions against existing definitions,
but (unlike <code>holtrace_restore</code>) will not allow new definitions.</p>
<p>This tool is written in C
and is not necessarily safe to run on untrusted input.
A VM is recommended.</p>
<p>On <a href="install.html"><code>rome1</code></a>,
<code>holtrace2ml</code> takes 1.53 seconds and 42MB RAM
to convert the 37.5MB pruned trace of <code>hol.ml</code>
into a 252MB file containing OCaml commands (<code>gzip -9</code> reduces this to 40.5MB).</p>
<p>Reading the commands into OCaml
is much less efficient than <code>holtrace_restore</code>.
(Also, OCaml's <code>.ml</code> parser produces <code>Uncaught exception: Stack overflow</code>
around 9MB of input.)
However, the verbosity can be useful for humans.</p><hr><font size=1><b>Version:</b>
This is version 2025.06.17 of the "ML REPL" web page.
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