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<H2>Issue DEFINE-METHOD-COMBINATION-BEHAVIOR Writeup</H2>
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<PRE><B>Issue:</B> <A HREF="iss103.htm">DEFINE-METHOD-COMBINATION-BEHAVIOR</A><P>
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<B>Forum:</B> X3J13 Letter Ballot<P>
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<B>References:</B> <A REL=DEFINITION HREF="../Body/m_defi_4.htm#define-method-combination"><B>DEFINE-METHOD-COMBINATION</B></A> (X3J13/92-102, p7-77)<P>
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Public review comment Barrett-23<P>
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Public review comment Loosemore-9<P>
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<B>Category:</B> CLARIFICATION<P>
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<B>Edit history:</B> 21-Jun-93, Version 1 by Steele (based on text by Loosemore)<P>
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<B>Status:</B> Proposal CLARIFY passed 11-0 on letter ballot 93-304.<P>
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<P>
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<B>Problem Description:<P>
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</B><P>
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A portion of a previously approved technical issue<P>
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(<A HREF="iss051.htm">CLOS-MACRO-COMPILATION</A>) that specified when <A REL=DEFINITION HREF="../Body/t_method.htm#method"><B>method</B></A> combinations are<P>
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executed was not incorporated into the draft.<P>
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<P>
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<B>Proposal (DEFINE-METHOD-COMBINATION:CLARIFY):<P>
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</B><P>
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Add this statement to the description of DEFINE-METHOD-COMBINATION:<P>
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<P>
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If a \macref{define-method-combination} \term{form} appears as a<P>
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\term{top level form}, the \term{compiler} must make the<P>
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\term{method combination} \term{name} be recognized as a valid<P>
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\term{method combination} \term{name} in subsequent \macref{defgeneric}<P>
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\term{forms}. However, the \term{method combination} is executed<P>
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no earlier than when the \macref{define-method-combination} \term{form}<P>
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is executed, and possibly as late as the time that \term{generic functions}<P>
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that use the \term{method combination} are executed.<P>
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<P>
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<B>Test Case:<P>
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</B><P>
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Not provided.<P>
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<P>
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<B>Rationale:<P>
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</B><P>
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Incorporate technical change already approved.<P>
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<P>
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<B>Current Practice:<P>
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</B><P>
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Not provided.<P>
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<P>
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<B>Cost to Implementors:<P>
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</B><P>
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Probably relatively small.<P>
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<P>
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<B>Cost to Users:<P>
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</B><P>
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None. This change doesn't affect anything already guaranteed to the user.<P>
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<P>
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<B>Cost of Non-Adoption:<P>
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</B><P>
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Vagueness in the language specification.<P>
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<P>
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<B>Benefits:<P>
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</B><P>
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Better program portability.<P>
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<P>
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<B>Editorial Impact:<P>
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</B><P>
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Small. A few small, localized edits.<P>
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<P>
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<B>Aesthetics:<P>
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</B><P>
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Mostly neutral.<P>
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<P>
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<B>Discussion:<P>
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</B> <P>
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This addresses comment Barrett #23 and Loosemore #9.<P>
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<P>
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<P>
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</PRE>
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<HR>
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