# From beebe@math.utah.edu Sat May 17 21:31:27 2003 # Return-Path: # Received: from localhost (aahz [127.0.0.1]) # by skeeve.com (8.12.5/8.12.5) with ESMTP id h4HIQmCw001380 # for ; Sat, 17 May 2003 21:31:27 +0300 # Received: from actcom.co.il [192.114.47.1] # by localhost with POP3 (fetchmail-5.9.0) # for arnold@localhost (single-drop); Sat, 17 May 2003 21:31:27 +0300 (IDT) # Received: by actcom.co.il (mbox arobbins) # (with Cubic Circle's cucipop (v1.31 1998/05/13) Sat May 17 21:34:07 2003) # X-From_: beebe@sunshine.math.utah.edu Fri May 16 20:38:45 2003 # Received: from smtp1.actcom.net.il by actcom.co.il with ESMTP # (8.11.6/actcom-0.2) id h4GHcd226764 for ; # Fri, 16 May 2003 20:38:40 +0300 (EET DST) # (rfc931-sender: mail.actcom.co.il [192.114.47.13]) # Received: from f7.net (consort.superb.net [209.61.216.22]) # by smtp1.actcom.net.il (8.12.8/8.12.8) with ESMTP id h4GHgBc2023067 # for ; Fri, 16 May 2003 20:42:13 +0300 # Received: from sunshine.math.utah.edu (sunshine.math.utah.edu [128.110.198.2]) # by f7.net (8.11.7/8.11.6) with ESMTP id h4GHcbf09202 # for ; Fri, 16 May 2003 13:38:37 -0400 # Received: from suncore.math.utah.edu (IDENT:r8KQWmkF4jVMLBhxpojXGNCAnBZB38ET@suncore.math.utah.edu [128.110.198.5]) # by sunshine.math.utah.edu (8.9.3p2/8.9.3) with ESMTP id LAA09111; # Fri, 16 May 2003 11:38:34 -0600 (MDT) # Received: (from beebe@localhost) # by suncore.math.utah.edu (8.9.3p2/8.9.3) id LAA01743; # Fri, 16 May 2003 11:38:34 -0600 (MDT) # Date: Fri, 16 May 2003 11:38:34 -0600 (MDT) # From: "Nelson H. F. Beebe" # To: "Arnold Robbins" # Cc: beebe@math.utah.edu # X-US-Mail: "Center for Scientific Computing, Department of Mathematics, 110 # LCB, University of Utah, 155 S 1400 E RM 233, Salt Lake City, UT # 84112-0090, USA" # X-Telephone: +1 801 581 5254 # X-FAX: +1 801 585 1640, +1 801 581 4148 # X-URL: http://www.math.utah.edu/~beebe # Subject: gawk-3.1.2[ab]: bug in delete # Message-ID: # # I discovered yesterday that one of my tools got broken by the upgrade # to gawk-3.1.2a and gawk-3.1.2b. For now, I've temporarily reset # /usr/local/bin/gawk on the Sun Solaris and Intel GNU/Linux systems # back to be gawk-3.1.2. # # This morning, I isolated the problem to the following small test case: # # % cat bug.awk BEGIN { clear_array(table) foo(table) # 3/2022: This was the original. Use of 'k' in the print was # undoubtedly a typo but it helped find a bug, so let's # make it for real # for (key in table) # print key, table[k] for (key in table) print key, table[key], "<" table[k] ">" clear_array(table) exit(0) } function clear_array(array, key) { for (key in array) delete array[key] } function foo(a) { a[1] = "one" a[2] = "two" } # # With nawk, mawk, and also gawk-3.1.2 or earlier, I get this: # # % mawk -f bug.awk # 1 # 2 # # However, with the two most recent gawk releases, I get: # # % gawk-3.1.2b -f bug.awk # gawk-3.1.2b: bug.awk:12: fatal: delete: illegal use of variable `table' as # array # # If the first clear_array() statement is commented out, it runs. # However, the problem is that in a large program, it may not be easy to # identify places where it is safe to invoke delete, so I believe the # old behavior is more desirable. # # ------------------------------------------------------------------------------- # - Nelson H. F. Beebe Tel: +1 801 581 5254 - # - Center for Scientific Computing FAX: +1 801 581 4148 - # - University of Utah Internet e-mail: beebe@math.utah.edu - # - Department of Mathematics, 110 LCB beebe@acm.org beebe@computer.org - # - 155 S 1400 E RM 233 beebe@ieee.org - # - Salt Lake City, UT 84112-0090, USA URL: http://www.math.utah.edu/~beebe - # ------------------------------------------------------------------------------- #