# Date: Fri, 06 Jan 2006 14:02:17 -0800

# From: Paul Eggert <eggert@CS.UCLA.EDU>

# Subject: gawk misparses $expr++ if expr ends in ++

# To: bug-gawk@gnu.org

# Message-id: <87irsxypzq.fsf@penguin.cs.ucla.edu>

# 

# Here's an example of the problem:

# 

# $ gawk 'BEGIN{a=3}{print $$a++++}'

# gawk: {print $$a++++}

# gawk:               ^ syntax error

# 

# But it's not a syntax error, as the expression conforms to the POSIX

# spec: it should be treated like '$($a++)++'.

# 

# Mawk, Solaris awk (old awk), and Solaris nawk all accept the

# expression.  For example:

# 

# $ echo '3 4 5 6 7 8 9' | nawk 'BEGIN{a=3}{print $$a++++}'

# 7

# 

# This is with gawk 3.1.5 on Solaris 8 (sparc).

# 

# 

# #####################################################################################

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# 

BEGIN { a = 3 }

{

	print "in:", $0

	print "a =", a

	print $$a++++

	print "out:", $0

}