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To: XEmacs Developers <xemacs-beta@xemacs.org>
Subject: `purecopy' with lists
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From: Hrvoje Niksic <hniksic@srce.hr>
Date: 23 Apr 1997 15:26:04 +0200
Message-ID: <kig67xdyioj.fsf@jagor.srce.hr>
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I have found the following in loaddefs.el:

(setq completion-ignored-extensions
      (mapcar 'purecopy
	      (if (eq system-type 'vax-vms)
		  '(".obj" ".elc" ".exe" ".bin" ".lbin" ".sbin"
		    ".dvi" ".toc" ".log" ".aux"
		    ".lof" ".brn" ".rnt" ".mem" ".lni" ".lis"
		    ".olb" ".tlb" ".mlb" ".hlb" ".glo" ".idx" ".lot" ".fmt")
		'(".o" ".elc" "~" ".bin" ".lbin" ".fasl"
		  ".dvi" ".toc" ".log" ".aux" ".a" ".ln"
		  ".lof" ".blg" ".bbl" ".glo" ".idx" ".lot" ".fmt"
		  ".diff" ".oi"))))

Why (mapcar 'purecopy ...)?  I think that the documentation of
`purecopy' clearly states that `purecopy' recursively copies lists,
leaving symbols alone.  Does this suffice:

(setq completion-ignored-extensions
      (purecopy
	(if (eq system-type 'vax-vms)
	       '(".obj" ".elc" ".exe" ".bin" ".lbin" ".sbin"
		 ".dvi" ".toc" ".log" ".aux"
		 ".lof" ".brn" ".rnt" ".mem" ".lni" ".lis"
		 ".olb" ".tlb" ".mlb" ".hlb" ".glo" ".idx" ".lot" ".fmt")
	      '(".o" ".elc" "~" ".bin" ".lbin" ".fasl"
		".dvi" ".toc" ".log" ".aux" ".a" ".ln"
		".lof" ".blg" ".bbl" ".glo" ".idx" ".lot" ".fmt"
		".diff" ".oi"))))

I ask this because I am preparing a patch to loaddefs.el, so I'd like
to know the exact usage of `purecopy'.

-- 
Hrvoje Niksic <hniksic@srce.hr> | Student at FER Zagreb, Croatia
--------------------------------+--------------------------------
Good pings come in small packets.

