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85 lines
5.8 KiB
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<title>CLiki: Issue STANDARDIZED-RESTART-NAMES</title>
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<span class="hidden">CLiki - Issue STANDARDIZED-RESTART-NAMES</span>
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<div id="content"><div id="content-area"><div id="article-title">Issue STANDARDIZED-RESTART-NAMES</div><div id="article"><a href="Issue.html" class="category">Issue</a>: STANDARDIZED-RESTART-NAMES<p>Forum: Editorial<p>References: <a href="https://www.cliki.net/site/HyperSpec/Body/mac_restart-bind.html" class="hyperspec">RESTART-BIND</a>, <a href="https://www.cliki.net/site/HyperSpec/Body/mac_restart-case.html" class="hyperspec">RESTART-CASE</a>, <a href="https://www.cliki.net/site/HyperSpec/Body/mac_with-simple-restart.html" class="hyperspec">WITH-SIMPLE-RESTART</a><p>Category: CLARIFICATION/CHANGE<p>Edit history: 2004-06-16, Version 1 by Christophe Rhodes<p>Status: For CLiki consideration<p><dl>
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<dt>Problem Description:
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</dt>
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<dd>
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In the restrictions on conforming programs, <a href="http://www.cliki.net/site/HyperSpec/Body/sec_11-1-2-1-2.html">section 11.1.2.1.2</a>, point 18, it is specified that except where specifically allowed, the consequences are undefined if any symbols in the Common Lisp package are bound as a restart name. However, no such permission is given anywhere, even for the standardized restart names; strictly, this means that the user is unable to participate in the protocols defined by those restarts portably, by binding those names where it makes semantic sense.<p></dd>
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<dt>Proposal (STANDARDIZED-RESTART-NAMES:ALLOW-BINDING):
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</dt>
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<dd>
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Explicitly allow binding the standardized restart names (<a href="https://www.cliki.net/site/HyperSpec/Body/any_abort.html" class="hyperspec">abort</a>, <a href="https://www.cliki.net/site/HyperSpec/Body/any_continue.html" class="hyperspec">continue</a>, <a href="https://www.cliki.net/site/HyperSpec/Body/any_muffle-warning.html" class="hyperspec">muffle-warning</a>, <a href="https://www.cliki.net/site/HyperSpec/Body/any_store-value.html" class="hyperspec">store-value</a> and <a href="https://www.cliki.net/site/HyperSpec/Body/any_use-value.html" class="hyperspec">use-value</a>) as restarts names by conforming code.<p></dd>
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<dt>Test case:
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</dt>
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<dd>
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</dd>
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</dl><pre>
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(defun read-eval-print-loop (level)
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(with-simple-restart (abort "Exit command level ~D." level)
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(loop
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(with-simple-restart (abort "Return to command level ~D." level)
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(let ((form (prog2 (fresh-line) (read) (fresh-line))))
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(prin1 (eval form)))))))
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</pre><p><dt>Rationale:
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</dt><dd>
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<tt>read-eval-print-loop</tt>, above, is an example from the ANSI standard; it was clearly intended that this should work.<p></dd><dt>Current practice:
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</dt><dd>
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The author knows of no implementation which is incompatible with proposal STANDARDIZED-RESTART-NAMES:ALLOW-BINDING.<p></dd><dt>Cost to Implementors:
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</dt><dd>
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Minimal.<p></dd><dt>Cost to Users:
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</dt><dd>
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None.<p></dd><dt>Cost of Non-Adoption:
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</dt><dd>
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Continued inability to participate in the protocols defined by the ANSI standard.<p></dd><dt>Benefits:
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</dt><dd>
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Enhanced portability of code, and enhanced ability of disparate programs to cooperate in protocols.<p></dd><dt>Aesthetics:
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</dt><dd><p></dd><dt>Discussion:
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</dt><dd><p></dd></div></div>
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