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72 lines
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Copyright (C) 2024 Tomas Volf
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Next: <a href="rnrs-mutable_002dstrings.html" accesskey="n" rel="next">rnrs mutable-strings</a>, Previous: <a href="rnrs-eval.html" accesskey="p" rel="prev">rnrs eval</a>, Up: <a href="R6RS-Standard-Libraries.html" accesskey="u" rel="up">R6RS Standard Libraries</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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<h4 class="subsubsection" id="rnrs-mutable_002dpairs-1"><span>7.6.2.29 rnrs mutable-pairs<a class="copiable-link" href="#rnrs-mutable_002dpairs-1"> ¶</a></span></h4>
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<p>The <code class="code">(rnrs mutable-pairs (6))</code> library provides the <code class="code">set-car!</code>
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and <code class="code">set-cdr!</code> procedures, which allow the <code class="code">car</code> and
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<code class="code">cdr</code> fields of a pair to be modified.
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<p>These procedures are identical to the ones provide by Guile’s core
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library. See <a class="xref" href="Pairs.html">Pairs</a>, for documentation. All pairs in Guile are
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mutable; consequently, these procedures will never throw the
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<code class="code">&assertion</code> condition described in the R6RS libraries
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specification.
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