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31 lines
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<TITLE>CLHS: Section 3.2.3.1.2</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="03_bcaa.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Previous]" SRC="../Graphics/Prev.gif" ALIGN=Bottom></A><A REL=UP HREF="03_bca.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Up]" SRC="../Graphics/Up.gif" ALIGN=Bottom></A><A REL=NEXT HREF="03_bd.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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3.2.3.1.2 Constraints on Macros and Compiler Macros</H2> <P>
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Except where explicitly stated otherwise, no <A REL=DEFINITION HREF="26_glo_m.htm#macro"><I>macro</I></A> defined in the Common Lisp standard produces an expansion that could cause any of the <A REL=DEFINITION HREF="26_glo_s.htm#subform"><I>subforms</I></A> of the <A REL=DEFINITION HREF="26_glo_m.htm#macro_form"><I>macro form</I></A> to be treated as <A REL=DEFINITION HREF="26_glo_t.htm#top_level_form"><I>top level forms</I></A>. If an <A REL=DEFINITION HREF="26_glo_i.htm#implementation"><I>implementation</I></A> also provides a <A REL=DEFINITION HREF="26_glo_s.htm#special_operator"><I>special operator</I></A> definition of a Common Lisp <A REL=DEFINITION HREF="26_glo_m.htm#macro"><I>macro</I></A>, the <A REL=DEFINITION HREF="26_glo_s.htm#special_operator"><I>special operator</I></A> definition must be semantically equivalent in this respect. <P>
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<A REL=DEFINITION HREF="26_glo_c.htm#compiler_macro"><I>Compiler macro</I></A> expansions must also have the same top level evaluation semantics as the <A REL=DEFINITION HREF="26_glo_f.htm#form"><I>form</I></A> which they replace. This is of concern both to <A REL=DEFINITION HREF="26_glo_c.htm#conforming_implementation"><I>conforming implementations</I></A> and to <A REL=DEFINITION HREF="26_glo_c.htm#conforming_program"><I>conforming programs</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/iss232.htm">MACRO-SUBFORMS-TOP-LEVEL-P:ADD-CONSTRAINTS</A><P></UL><HR>
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