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<TITLE>CLHS: Issue IMPORT-SETF-SYMBOL-PACKAGE Writeup</TITLE>
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<H2>Issue IMPORT-SETF-SYMBOL-PACKAGE Writeup</H2>
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<PRE><B>Issue:</B> <A HREF="iss194.htm">IMPORT-SETF-SYMBOL-PACKAGE</A><P>
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<B>References:</B> <A REL=DEFINITION HREF="../Body/f_import.htm#import"><B>IMPORT</B></A> (CLtL p. 186)<P>
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<B>Category:</B> CLARIFICATION.<P>
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<B>Edit History:</B> Version 2 at committee meeting 15-Mar-87 15:19:23<P>
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Version 3 by Masinter 15-Mar-87 18:42:13<P>
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Version 4 29-May-87 by Masinter, remove confusing<P>
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"to further clarify".<P>
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Version 5 to X3J13<P>
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<P>
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<B>Problem Description:<P>
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</B><P>
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The action of <A REL=DEFINITION HREF="../Body/f_import.htm#import"><B>IMPORT</B></A> on the home package of a symbol is not described<P>
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well; does it affects the "home package" of a symbol.<P>
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<P>
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<B>Proposal (IMPORT-SETF-SYMBOL-PACKAGE:YES):<P>
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</B><P>
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<A REL=DEFINITION HREF="../Body/f_import.htm#import"><B>IMPORT</B></A> behaves as follows: if any symbol to be imported has no home<P>
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package (<A REL=DEFINITION HREF="../Body/f_symb_3.htm#symbol-package"><B>SYMBOL-PACKAGE</B></A> returns <A REL=DEFINITION HREF="../Body/a_nil.htm#nil"><B>NIL</B></A>), then <A REL=DEFINITION HREF="../Body/f_import.htm#import"><B>IMPORT</B></A> sets the home package<P>
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of the symbol to the specified package being imported to.<P>
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<P>
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<B>Rationale:<P>
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</B><P>
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<B>Current practice:<P>
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</B><P>
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Most Common Lisp implementations work this way. <P>
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<P>
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<B>Adoption Cost:<P>
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</B><P>
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small -- it requires a simple rewrite if not done this way.<P>
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<P>
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<B>Benefits:<P>
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</B><P>
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Without this proposal, there is confusion about how Common Lisp works,<P>
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and the risks that some new implementations will not work this way.<P>
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<P>
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<B>Conversion Cost:<P>
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</B><P>
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None, as this describes current practice. <P>
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<P>
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<B>Discussion: <P>
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</B><P>
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The cleanup committee supports this clarification.<P>
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<P>
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</PRE>
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