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# Date: Fri, 16 May 2003 11:38:34 -0600 (MDT)
# From: "Nelson H. F. Beebe" <beebe@math.utah.edu>
# To: "Arnold Robbins" <arnold@skeeve.com>
# 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: <CMM.0.92.0.1053106714.beebe@suncore.math.utah.edu>
#
# 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)
for (key in table)
print 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 -
# -------------------------------------------------------------------------------
#