<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; "><DIV>I work mostly in MCL, but often I switch to OpenMCL to track down bugs and/or to note efficiency issues. I've seen a strange error in MCL with respect to this form/closure:</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><FONT class="Apple-style-span" color="#0000CC">(let ((copy-htable (make-hash-table #+Ignore :rehash-size #+Ignore 1.5)))</FONT></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><FONT class="Apple-style-span" color="#0000CC"> </FONT><FONT class="Apple-style-span" color="#0000CC">(defmethod copy-top-level (ORIGINAL-THING)</FONT></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><FONT class="Apple-style-span" color="#0000CC"> </FONT><FONT class="Apple-style-span" color="#0000CC">(clrhash COPY-HTABLE)</FONT></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><FONT class="Apple-style-span" color="#0000CC"> </FONT><FONT class="Apple-style-span" color="#0000CC">(copy-one ORIGINAL-THING COPY-HTABLE)))</FONT></DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>This is part of the library that my group uses. The trouble is that the copy-htable is getting smashed by something - probably GC. This error occurs after ~18 hrs of computation. So I fired up OpenMCL to see if I could reproduce the error there. It takes only 10 minutes for OpenMCL to crash and it does so without errors or a backtrace - the process just dies. I have no idea whether the two problems are related, but I usually have little (to no) trouble running the offending code (and other code) in OpenMCL.</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>Any suggestions on why OpenMCL would crash in such a way?</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>jjm</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>MCL Version 5.1b4</DIV><DIV>OpenMCL Version (Beta: Darwin) 0.14.3!</DIV><DIV>Mac OS 10.4.2 Dual G5 2.5 GHz.</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV><BR class="khtml-block-placeholder"></DIV></BODY></HTML>