allow boolean assign ops to be lvalues

	From: Stephen McCamant <smccam@uclink4.berkeley.edu>
	Date: Mon, 11 Jan 1999 16:52:18 -0600 (CST)
	Message-ID: <13978.32609.495338.544643@alias-2.pr.mcs.net>
	--
	From: Hugo van der Sanden <hv@crypt.compulink.co.uk>
	Date: Mon, 18 Jan 1999 10:04:00 +0000
	Message-Id: <199901181004.KAA17471@crypt.compulink.co.uk>
	Subject: Re: [inconsistency 5.005_54] ||= not an lvalue

p4raw-id: //depot/perl@2901

1 files changed, 44 insertions, 0 deletions

diff --git a/t/op/lop.t b/t/op/lop.t
new file mode 100755
index 0000000000..f15201ff09
--- /dev/null
+++ b/t/op/lop.t
@@ -0,0 +1,44 @@
+#!./perl
+
+#
+# test the logical operators '&&', '||', '!', 'and', 'or', 'not'
+#
+
+BEGIN {
+    chdir 't' if -d 't';
+    unshift @INC, '../lib';
+}
+
+print "1..7\n";
+
+my $test = 0;
+for my $i (undef, 0 .. 2, "", "0 but true") {
+    my $true = 1;
+    my $false = 0;
+    for my $j (undef, 0 .. 2, "", "0 but true") {
+	$true &&= !(
+	    ((!$i || !$j) != !($i && $j))
+	    or (!($i || $j) != (!$i && !$j))
+	    or (!!($i || $j) != !(!$i && !$j))
+	    or (!(!$i || !$j) != !!($i && $j))
+	);
+	$false ||= (
+	    ((!$i || !$j) == !!($i && $j))
+	    and (!!($i || $j) == (!$i && !$j))
+	    and ((!$i || $j) == ($i && !$j))
+	    and (($i || !$j) != (!$i && $j))
+	);
+    }
+    if (not $true) {
+	print "not ";
+    } elsif ($false) {
+	print "not ";
+    }
+    print "ok ", ++$test, "\n";
+}
+
+# $test == 6
+my $i = 0;
+(($i ||= 1) &&= 3) += 4;
+print "not " unless $i == 7;
+print "ok ", ++$test, "\n";