fix bug in backtracking optimizer (from Makoto Ishisone

<ishisone@sra.co.jp>)

p4raw-id: //depot/perl@5151

1 files changed, 14 insertions, 1 deletions

diff --git a/t/op/pat.t b/t/op/pat.t
index 439796d239..142b82e2ad 100755
--- a/t/op/pat.t
+++ b/t/op/pat.t
@@ -4,7 +4,7 @@
 # the format supported by op/regexp.t.  If you want to add a test
 # that does fit that format, add it to op/re_tests, not here.
 
-print "1..207\n";
+print "1..210\n";
 
 BEGIN {
     chdir 't' if -d 't';
@@ -978,3 +978,16 @@ $test++;
 print "not " if "@b" ne "@c";
 print "ok $test\n";
 $test++;
+
+# see if backtracking optimization works correctly
+"\n\n" =~ /\n  $ \n/x or print "not ";
+print "ok $test\n";
+$test++;
+
+"\n\n" =~ /\n* $ \n/x or print "not ";
+print "ok $test\n";
+$test++;
+
+"\n\n" =~ /\n+ $ \n/x or print "not ";
+print "ok $test\n";
+$test++;