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34 lines
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<TITLE>CLHS: Section 11.1.2.1.2.1</TITLE>
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<H1><A REV=MADE HREF="http://www.lispworks.com/"><IMG WIDTH=80 HEIGHT=65 ALT="[LISPWORKS]" SRC="../Graphics/LWSmall.gif" ALIGN=Bottom></A><A REL=TOP HREF="../Front/index.htm"><IMG WIDTH=237 HEIGHT=65 ALT="[Common Lisp HyperSpec (TM)]" SRC="../Graphics/CLHS_Sm.gif" ALIGN=Bottom></A> <A REL=PREV HREF="11_abab.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Previous]" SRC="../Graphics/Prev.gif" ALIGN=Bottom></A><A REL=UP HREF="11_abab.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Up]" SRC="../Graphics/Up.gif" ALIGN=Bottom></A><A REL=NEXT HREF="11_abb.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Next]" SRC="../Graphics/Next.gif" ALIGN=Bottom></A></H1>
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<H2>
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11.1.2.1.2.1 Some Exceptions to Constraints on the COMMON-LISP Package for Conforming Programs</H2> <P>
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If an <A REL=DEFINITION HREF="26_glo_e.htm#external_symbol"><I>external symbol</I></A> of the <TT>COMMON-LISP</TT> package is not globally defined as a <A REL=DEFINITION HREF="26_glo_s.htm#standardized"><I>standardized</I></A> <A REL=DEFINITION HREF="26_glo_d.htm#dynamic_variable"><I>dynamic variable</I></A> or <A REL=DEFINITION HREF="26_glo_c.htm#constant_variable"><I>constant variable</I></A>, it is allowed to lexically <A REL=DEFINITION HREF="26_glo_b.htm#bind"><I>bind</I></A> it and to declare the <A REL=DEFINITION HREF="d_type.htm#type"><B>type</B></A> of that <A REL=DEFINITION HREF="26_glo_b.htm#binding"><I>binding</I></A>, and it is allowed to locally <A REL=DEFINITION HREF="26_glo_e.htm#establish"><I>establish</I></A> it as a <A REL=DEFINITION HREF="26_glo_s.htm#symbol_macro"><I>symbol macro</I></A> (e.g., with <A REL=DEFINITION HREF="s_symbol.htm#symbol-macrolet"><B>symbol-macrolet</B></A>). <P>
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Unless explicitly specified otherwise, if an <A REL=DEFINITION HREF="26_glo_e.htm#external_symbol"><I>external symbol</I></A> of the <TT>COMMON-LISP</TT> package is globally defined as a <A REL=DEFINITION HREF="26_glo_s.htm#standardized"><I>standardized</I></A> <A REL=DEFINITION HREF="26_glo_d.htm#dynamic_variable"><I>dynamic variable</I></A>, it is permitted to <A REL=DEFINITION HREF="26_glo_b.htm#bind"><I>bind</I></A> or <A REL=DEFINITION HREF="26_glo_a.htm#assign"><I>assign</I></A> that <A REL=DEFINITION HREF="26_glo_d.htm#dynamic_variable"><I>dynamic variable</I></A> provided that the ``Value Type'' constraints on the <A REL=DEFINITION HREF="26_glo_d.htm#dynamic_variable"><I>dynamic variable</I></A> are maintained, and that the new <A REL=DEFINITION HREF="26_glo_v.htm#value"><I>value</I></A> of the <A REL=DEFINITION HREF="26_glo_v.htm#variable"><I>variable</I></A> is consistent with the stated purpose of the <A REL=DEFINITION HREF="26_glo_v.htm#variable"><I>variable</I></A>. <P>
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If an <A REL=DEFINITION HREF="26_glo_e.htm#external_symbol"><I>external symbol</I></A> of the <TT>COMMON-LISP</TT> package is not defined as a <A REL=DEFINITION HREF="26_glo_s.htm#standardized"><I>standardized</I></A> <A REL=DEFINITION HREF="26_glo_f.htm#function"><I>function</I></A>, <A REL=DEFINITION HREF="26_glo_m.htm#macro"><I>macro</I></A>, or <A REL=DEFINITION HREF="26_glo_s.htm#special_operator"><I>special operator</I></A>, it is allowed to lexically <A REL=DEFINITION HREF="26_glo_b.htm#bind"><I>bind</I></A> it as a <A REL=DEFINITION HREF="26_glo_f.htm#function"><I>function</I></A> (e.g., with <A REL=DEFINITION HREF="s_flet_.htm#flet"><B>flet</B></A>), to declare the <A REL=DEFINITION HREF="d_ftype.htm#ftype"><B>ftype</B></A> of that <A REL=DEFINITION HREF="26_glo_b.htm#binding"><I>binding</I></A>, and (in <A REL=DEFINITION HREF="26_glo_i.htm#implementation"><I>implementations</I></A> which provide the ability to do so) to <A REL=DEFINITION HREF="m_tracec.htm#trace"><B>trace</B></A> that <A REL=DEFINITION HREF="26_glo_b.htm#binding"><I>binding</I></A>. <P>
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If an <A REL=DEFINITION HREF="26_glo_e.htm#external_symbol"><I>external symbol</I></A> of the <TT>COMMON-LISP</TT> package is not defined as a <A REL=DEFINITION HREF="26_glo_s.htm#standardized"><I>standardized</I></A> <A REL=DEFINITION HREF="26_glo_f.htm#function"><I>function</I></A>, <A REL=DEFINITION HREF="26_glo_m.htm#macro"><I>macro</I></A>, or <A REL=DEFINITION HREF="26_glo_s.htm#special_operator"><I>special operator</I></A>, it is allowed to lexically <A REL=DEFINITION HREF="26_glo_b.htm#bind"><I>bind</I></A> it as a <A REL=DEFINITION HREF="26_glo_m.htm#macro"><I>macro</I></A> (e.g., with <A REL=DEFINITION HREF="s_flet_.htm#macrolet"><B>macrolet</B></A>). <P>
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<P>
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If an <A REL=DEFINITION HREF="26_glo_e.htm#external_symbol"><I>external symbol</I></A> of the <TT>COMMON-LISP</TT> package is not defined as a <A REL=DEFINITION HREF="26_glo_s.htm#standardized"><I>standardized</I></A> <A REL=DEFINITION HREF="26_glo_f.htm#function"><I>function</I></A>, <A REL=DEFINITION HREF="26_glo_m.htm#macro"><I>macro</I></A>, or <A REL=DEFINITION HREF="26_glo_s.htm#special_operator"><I>special operator</I></A>, it is allowed to lexically <A REL=DEFINITION HREF="26_glo_b.htm#bind"><I>bind</I></A> its <A REL=DEFINITION HREF="26_glo_s.htm#setf_function_name"><I>setf function name</I></A> as a <A REL=DEFINITION HREF="26_glo_f.htm#function"><I>function</I></A>, and to declare the <A REL=DEFINITION HREF="d_ftype.htm#ftype"><B>ftype</B></A> of that <A REL=DEFINITION HREF="26_glo_b.htm#binding"><I>binding</I></A>. <P>
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<P><HR>The following <A REL=META HREF="../Front/X3J13Iss.htm">X3J13 cleanup issue</A>, <I>not part of the specification</I>, applies to this section:<P><UL><LI> <A REL=CHILD HREF="../Issues/iss213.htm">LISP-SYMBOL-REDEFINITION-AGAIN:MORE-FIXES</A><P></UL><HR>
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<A REL=NAVIGATOR HREF="../Front/StartPts.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Starting Points]" SRC="../Graphics/StartPts.gif" ALIGN=Bottom></A><A REL=TOC HREF="../Front/Contents.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Contents]" SRC="../Graphics/Contents.gif" ALIGN=Bottom></A><A REL=INDEX HREF="../Front/X_Master.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Index]" SRC="../Graphics/Index.gif" ALIGN=Bottom></A><A REL=INDEX HREF="../Front/X_Symbol.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Symbols]" SRC="../Graphics/Symbols.gif" ALIGN=Bottom></A><A REL=GLOSSARY HREF="../Body/26_a.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Glossary]" SRC="../Graphics/Glossary.gif" ALIGN=Bottom></A><A HREF="../Front/X3J13Iss.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Issues]" SRC="../Graphics/Issues.gif" ALIGN=Bottom></A><BR>
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<A REL=COPYRIGHT HREF="../Front/Help.htm#Legal"><I>Copyright 1996-2005, LispWorks Ltd. All rights reserved.</I></A><P>
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