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<h1>XMLSimplifyTypes</h1>
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<div class="paragraph"><p><a href="XMLSimplifyTypes">XMLSimplifyTypes</a> is an optimization pass for the <a href="XML">XML</a>
<a href="IntermediateLanguage">IntermediateLanguage</a>, invoked from <a href="XMLSimplify">XMLSimplify</a>.</p></div>
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<div class="sect1">
<h2 id="_description">Description</h2>
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<div class="paragraph"><p>This pass simplifies types in an <a href="XML">XML</a> program, eliminating all
unused type arguments.</p></div>
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<h2 id="_implementation">Implementation</h2>
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<div class="ulist"><ul>
<li>
<p>
<a href="https://github.com/MLton/mlton/blob/master/mlton/xml/simplify-types.sig"><span class="monospaced">simplify-types.sig</span></a>
</p>
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<p>
<a href="https://github.com/MLton/mlton/blob/master/mlton/xml/simplify-types.fun"><span class="monospaced">simplify-types.fun</span></a>
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<h2 id="_details_and_notes">Details and Notes</h2>
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<div class="paragraph"><p>It first computes a simple fixpoint on all the <span class="monospaced">datatype</span> declarations
to determine which <span class="monospaced">datatype</span> <span class="monospaced">tycon</span> args are actually used. Then it
does a single pass over the program to determine which polymorphic
declaration type variables are used, and rewrites types to eliminate
unused type arguments.</p></div>
<div class="paragraph"><p>This pass should eliminate any spurious duplication that the
<a href="Monomorphise">Monomorphise</a> pass might perform due to phantom types.</p></div>
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