Test patches for OS/2

a) Teaches tests in os2/OS2/*/* new format of $Config{extensions};
 os2/OS2/ExtAttr/t/os2_ea.t os2/OS2/PrfDB/t/os2_prfdb.t
 os2/OS2/REXX/t/rx_cmprt.t os2/OS2/REXX/t/rx_dllld.t
 os2/OS2/REXX/t/rx_objcall.t os2/OS2/REXX/t/rx_sql.test
 os2/OS2/REXX/t/rx_tiesql.test os2/OS2/REXX/t/rx_tievar.t
 os2/OS2/REXX/t/rx_tieydb.t os2/OS2/REXX/t/rx_varset.t
 os2/OS2/REXX/t/rx_vrexx.t

b) Closes all the files before unlinking - for DOSISH systems;
 t/cmd/while.t t/comp/multiline.t t/io/argv.t t/lib/anydbm.t
 t/lib/gdbm.t t/lib/ndbm.t t/lib/odbm.t t/lib/sdbm.t

c) t/README mentions running `harness' to get better granularity;
 t/README

d) New test op/lex_assign.t added - will check optimization of lexicals
	when applied - 153 cases (some just ignored since hard to implement).
 MANIFEST t/op/lex_assign.t

e) When a script is started via shell, $Config{exe_ext} may be appended.
 t/op/magic.t

f) path/echo may print a warning if run without args
 t/comp/colon.t 

g) Error explanations more verbose
  t/op/cmp.t t/op/magic.t

p5p-msgid: <199701170448.XAA28948@monk.mps.ohio-state.edu>

25 files changed, 252 insertions, 18 deletions

diff --git a/MANIFEST b/MANIFEST
index 6b202da522..6a45129282 100644
--- a/MANIFEST
+++ b/MANIFEST
@@ -657,6 +657,7 @@ t/op/inc.t		See if inc/dec of integers near 32 bit limit work
 t/op/index.t		See if index works
 t/op/int.t		See if int works
 t/op/join.t		See if join works
+t/op/lex_assign.t	See if assignment to lexicals work
 t/op/list.t		See if array lists work
 t/op/local.t		See if local works
 t/op/magic.t		See if magic variables work
diff --git a/os2/OS2/ExtAttr/t/os2_ea.t b/os2/OS2/ExtAttr/t/os2_ea.t
index dc6f996564..a1da398d45 100644
--- a/os2/OS2/ExtAttr/t/os2_ea.t
+++ b/os2/OS2/ExtAttr/t/os2_ea.t
@@ -2,7 +2,7 @@ BEGIN {
     chdir 't' if -d 't/lib';
     @INC = '../lib' if -d 'lib';
     require Config; import Config;
-    if (-d 'lib' and $Config{'extensions'} !~ /\bOS2::REXX\b/) {
+    if (-d 'lib' and $Config{'extensions'} !~ /\bOS2(::|\/)REXX\b/) {
 	print "1..0\n";
 	exit 0;
     }
@@ -76,4 +76,4 @@ print "ok 12\n";
 }
 
 print "ok 21\n";
-
+unlink 't.out';
diff --git a/os2/OS2/PrfDB/t/os2_prfdb.t b/os2/OS2/PrfDB/t/os2_prfdb.t
index 4c0883db50..a8c9752d36 100644
--- a/os2/OS2/PrfDB/t/os2_prfdb.t
+++ b/os2/OS2/PrfDB/t/os2_prfdb.t
@@ -2,7 +2,7 @@ BEGIN {
     chdir 't' if -d 't/lib';
     @INC = '../lib' if -d 'lib';
     require Config; import Config;
-    if (-d 'lib' and $Config{'extensions'} !~ /\bOS2::PrfDB\b/) {
+    if (-d 'lib' and $Config{'extensions'} !~ /\bOS2(::|\/)PrfDB\b/) {
 	print "1..0\n";
 	exit 0;
     }
@@ -183,3 +183,6 @@ tie %hash2, 'OS2::PrfDB', $inifile;
 print "ok 47\n";
 
 print ($hash2{nnn}->{mmm} eq "67" ? "ok 48\n" : "not ok 48\n# `$val'\n");
+
+untie %hash2;
+unlink $inifile;
diff --git a/os2/OS2/REXX/t/rx_cmprt.t b/os2/OS2/REXX/t/rx_cmprt.t
index a73e43e36e..f2113e3aa3 100644
--- a/os2/OS2/REXX/t/rx_cmprt.t
+++ b/os2/OS2/REXX/t/rx_cmprt.t
@@ -2,7 +2,7 @@ BEGIN {
     chdir 't' if -d 't/lib';
     @INC = '../lib' if -d 'lib';
     require Config; import Config;
-    if (-d 'lib' and $Config{'extensions'} !~ /\bOS2::REXX\b/) {
+    if (-d 'lib' and $Config{'extensions'} !~ /\bOS2(::|\/)REXX\b/) {
 	print "1..0\n";
 	exit 0;
     }
diff --git a/os2/OS2/REXX/t/rx_dllld.t b/os2/OS2/REXX/t/rx_dllld.t
index 317743f3cb..9d81bf3e56 100644
--- a/os2/OS2/REXX/t/rx_dllld.t
+++ b/os2/OS2/REXX/t/rx_dllld.t
@@ -2,7 +2,7 @@ BEGIN {
     chdir 't' if -d 't/lib';
     @INC = '../lib' if -d 'lib';
     require Config; import Config;
-    if (-d 'lib' and $Config{'extensions'} !~ /\bOS2::REXX\b/) {
+    if (-d 'lib' and $Config{'extensions'} !~ /\bOS2(::|\/)REXX\b/) {
 	print "1..0\n";
 	exit 0;
     }
diff --git a/os2/OS2/REXX/t/rx_objcall.t b/os2/OS2/REXX/t/rx_objcall.t
index b4f04c308a..cb3c52a8b6 100644
--- a/os2/OS2/REXX/t/rx_objcall.t
+++ b/os2/OS2/REXX/t/rx_objcall.t
@@ -2,7 +2,7 @@ BEGIN {
     chdir 't' if -d 't/lib';
     @INC = '../lib' if -d 'lib';
     require Config; import Config;
-    if (-d 'lib' and $Config{'extensions'} !~ /\bOS2::REXX\b/) {
+    if (-d 'lib' and $Config{'extensions'} !~ /\bOS2(::|\/)REXX\b/) {
 	print "1..0\n";
 	exit 0;
     }
diff --git a/os2/OS2/REXX/t/rx_sql.test b/os2/OS2/REXX/t/rx_sql.test
index 4f984250a3..602c76dc47 100644
--- a/os2/OS2/REXX/t/rx_sql.test
+++ b/os2/OS2/REXX/t/rx_sql.test
@@ -2,7 +2,7 @@ BEGIN {
     chdir 't' if -d 't/lib';
     @INC = '../lib';
     require Config; import Config;
-    if ($Config{'extensions'} !~ /\bOS2::REXX\b/) {
+    if ($Config{'extensions'} !~ /\bOS2(::|\/)REXX\b/) {
 	print "1..0\n";
 	exit 0;
     }
diff --git a/os2/OS2/REXX/t/rx_tiesql.test b/os2/OS2/REXX/t/rx_tiesql.test
index 2947516755..c85a1e990b 100644
--- a/os2/OS2/REXX/t/rx_tiesql.test
+++ b/os2/OS2/REXX/t/rx_tiesql.test
@@ -2,7 +2,7 @@ BEGIN {
     chdir 't' if -d 't/lib';
     @INC = '../lib';
     require Config; import Config;
-    if ($Config{'extensions'} !~ /\bOS2::REXX\b/) {
+    if ($Config{'extensions'} !~ /\bOS2(::|\/)REXX\b/) {
 	print "1..0\n";
 	exit 0;
     }
diff --git a/os2/OS2/REXX/t/rx_tievar.t b/os2/OS2/REXX/t/rx_tievar.t
index 6132e23f80..77f90c2f59 100644
--- a/os2/OS2/REXX/t/rx_tievar.t
+++ b/os2/OS2/REXX/t/rx_tievar.t
@@ -2,7 +2,7 @@ BEGIN {
     chdir 't' if -d 't/lib';
     @INC = '../lib' if -d 'lib';
     require Config; import Config;
-    if (-d 'lib' and $Config{'extensions'} !~ /\bOS2::REXX\b/) {
+    if (-d 'lib' and $Config{'extensions'} !~ /\bOS2(::|\/)REXX\b/) {
 	print "1..0\n";
 	exit 0;
     }
diff --git a/os2/OS2/REXX/t/rx_tieydb.t b/os2/OS2/REXX/t/rx_tieydb.t
index 8251051265..30a2dafb62 100644
--- a/os2/OS2/REXX/t/rx_tieydb.t
+++ b/os2/OS2/REXX/t/rx_tieydb.t
@@ -2,7 +2,7 @@ BEGIN {
     chdir 't' if -d 't/lib';
     @INC = '../lib' if -d 'lib';
     require Config; import Config;
-    if (-d 'lib' and $Config{'extensions'} !~ /\bOS2::REXX\b/) {
+    if (-d 'lib' and $Config{'extensions'} !~ /\bOS2(::|\/)REXX\b/) {
 	print "1..0\n";
 	exit 0;
     }
diff --git a/os2/OS2/REXX/t/rx_varset.t b/os2/OS2/REXX/t/rx_varset.t
index 9d4f3b2e56..166cf53623 100644
--- a/os2/OS2/REXX/t/rx_varset.t
+++ b/os2/OS2/REXX/t/rx_varset.t
@@ -2,7 +2,7 @@ BEGIN {
     chdir 't' if -d 't/lib';
     @INC = '../lib' if -d 'lib';
     require Config; import Config;
-    if (-d 'lib' and $Config{'extensions'} !~ /\bOS2::REXX\b/) {
+    if (-d 'lib' and $Config{'extensions'} !~ /\bOS2(::|\/)REXX\b/) {
 	print "1..0\n";
 	exit 0;
     }
diff --git a/os2/OS2/REXX/t/rx_vrexx.t b/os2/OS2/REXX/t/rx_vrexx.t
index a40749f55f..04ca6636db 100644
--- a/os2/OS2/REXX/t/rx_vrexx.t
+++ b/os2/OS2/REXX/t/rx_vrexx.t
@@ -2,7 +2,7 @@ BEGIN {
     chdir 't' if -d 't/lib';
     @INC = '../lib' if -d 'lib';
     require Config; import Config;
-    if (-d 'lib' and $Config{'extensions'} !~ /\bOS2::REXX\b/) {
+    if (-d 'lib' and $Config{'extensions'} !~ /\bOS2(::|\/)REXX\b/) {
 	print "1..0\n";
 	exit 0;
     }
diff --git a/t/README b/t/README
index 00bf561c23..6fb569b98f 100644
--- a/t/README
+++ b/t/README
@@ -8,4 +8,9 @@ If you put out extra lines with a '#' character on the front, you don't
 have to worry about removing the extra print statements later since TEST
 ignores lines beginning with '#'.
 
+If you know that "basic" features work and expect that some test are going
+to fail, it is adviced to run tests via Test::Harness thusly:
+	./perl -I../lib harness
+This would pinpoint failed tests with better granularity.
+
 If you come up with new tests, send them to larry@wall.org.
diff --git a/t/cmd/while.t b/t/cmd/while.t
index 4c8c10e990..c6e464d444 100755
--- a/t/cmd/while.t
+++ b/t/cmd/while.t
@@ -90,6 +90,7 @@ loop: while (<fh>) {
 if (!eof || $bad) {print "not ok 8\n";} else {print "ok 8\n";}
 if (!$badcont) {print "ok 9\n";} else {print "not ok 9\n";}
 
+close(fh) || die "Can't close Cmd_while.tmp.";
 unlink 'Cmd_while.tmp' || `/bin/rm Cmd_While.tmp`;
 
 #$x = 0;
diff --git a/t/comp/colon.t b/t/comp/colon.t
index 2a37367d75..d2c64fe4c5 100755
--- a/t/comp/colon.t
+++ b/t/comp/colon.t
@@ -110,7 +110,7 @@ ok 18, (not eval "qw:1" and
 	not eval "qw:echo:ohce: >= 0");
 
 ok 19, (not eval "qx:1" and
-	eval "qx:echo: eq qx|echo|" and
+	eval "qx:echo 1: eq qx|echo 1|" and	# echo without args may warn
 	not eval "qx:echo:ohce: >= 0");
 
 ok 20, (not eval "s:1" and
diff --git a/t/comp/multiline.t b/t/comp/multiline.t
index 634b06a7a8..0e022e9992 100755
--- a/t/comp/multiline.t
+++ b/t/comp/multiline.t
@@ -35,6 +35,8 @@ if ($count == 3) {print "ok 3\n";} else {print "not ok 3\n";}
 $_ = `cat Comp.try`;
 
 if (/.*\n.*\n.*\n$/) {print "ok 4\n";} else {print "not ok 4\n";}
+
+close(try) || (die "Can't close temp file.");
 unlink 'Comp.try' || `/bin/rm -f Comp.try`;
 
 if ($_ eq $y) {print "ok 5\n";} else {print "not ok 5\n";}
diff --git a/t/io/argv.t b/t/io/argv.t
index 40ed23b373..bf592f91cb 100755
--- a/t/io/argv.t
+++ b/t/io/argv.t
@@ -34,3 +34,4 @@ else
     {print "not ok 5\n";}
 
 `/bin/rm -f Io.argv.tmp` if -x '/bin/rm';
+unlink 'Io.argv.tmp';
diff --git a/t/lib/anydbm.t b/t/lib/anydbm.t
index 80b39df141..52ab22b13e 100755
--- a/t/lib/anydbm.t
+++ b/t/lib/anydbm.t
@@ -111,4 +111,5 @@ print join(':',200..400) eq join(':',@foo) ? "ok 10\n" : "not ok 10\n";
 print ($h{'foo'} eq '' ? "ok 11\n" : "not ok 11\n");
 print ($h{''} eq 'bar' ? "ok 12\n" : "not ok 12\n");
 
+untie %h;
 unlink 'Op.dbmx.dir', $Dfile;
diff --git a/t/lib/gdbm.t b/t/lib/gdbm.t
index c888c00f85..62bb936ff1 100755
--- a/t/lib/gdbm.t
+++ b/t/lib/gdbm.t
@@ -114,4 +114,5 @@ print join(':',200..400) eq join(':',@foo) ? "ok 10\n" : "not ok 10\n";
 print ($h{'foo'} eq '' ? "ok 11\n" : "not ok 11\n");
 print ($h{''} eq 'bar' ? "ok 12\n" : "not ok 12\n");
 
+untie %h;
 unlink 'Op.dbmx.dir', $Dfile;
diff --git a/t/lib/ndbm.t b/t/lib/ndbm.t
index 15aa93a725..8e2ba8164a 100755
--- a/t/lib/ndbm.t
+++ b/t/lib/ndbm.t
@@ -117,4 +117,5 @@ print join(':',200..400) eq join(':',@foo) ? "ok 10\n" : "not ok 10\n";
 print ($h{'foo'} eq '' ? "ok 11\n" : "not ok 11\n");
 print ($h{''} eq 'bar' ? "ok 12\n" : "not ok 12\n");
 
+untie %h;
 unlink 'Op.dbmx.dir', $Dfile;
diff --git a/t/lib/odbm.t b/t/lib/odbm.t
index 0b1fa50cb9..0c530d2238 100755
--- a/t/lib/odbm.t
+++ b/t/lib/odbm.t
@@ -117,4 +117,5 @@ print join(':',200..400) eq join(':',@foo) ? "ok 10\n" : "not ok 10\n";
 print ($h{'foo'} eq '' ? "ok 11\n" : "not ok 11\n");
 print ($h{''} eq 'bar' ? "ok 12\n" : "not ok 12\n");
 
+untie %h;
 unlink 'Op.dbmx.dir', $Dfile;
diff --git a/t/lib/sdbm.t b/t/lib/sdbm.t
index 1bb3fde392..65419f9711 100755
--- a/t/lib/sdbm.t
+++ b/t/lib/sdbm.t
@@ -116,4 +116,5 @@ print join(':',200..400) eq join(':',@foo) ? "ok 10\n" : "not ok 10\n";
 print ($h{'foo'} eq '' ? "ok 11\n" : "not ok 11\n");
 print ($h{''} eq 'bar' ? "ok 12\n" : "not ok 12\n");
 
+untie %h;
 unlink 'Op.dbmx.dir', $Dfile;
diff --git a/t/op/cmp.t b/t/op/cmp.t
index aba7c2e9dc..4a7e68d448 100755
--- a/t/op/cmp.t
+++ b/t/op/cmp.t
@@ -18,7 +18,7 @@ for my $i (0..$#FOO) {
 	    print "ok $ok\n";
 	}
 	else {
-	    print "not ok $ok ($FOO[$i] <=> $FOO[$j])\n";
+	    print "not ok $ok ($FOO[$i] <=> $FOO[$j]) gives: '$cmp'\n";
 	}
 	$ok++;
 	$cmp = $FOO[$i] cmp $FOO[$j];
@@ -29,7 +29,7 @@ for my $i (0..$#FOO) {
 	    print "ok $ok\n";
 	}
 	else {
-	    print "not ok $ok ($FOO[$i] cmp $FOO[$j])\n";
+	    print "not ok $ok ($FOO[$i] cmp $FOO[$j]) gives '$cmp'\n";
 	}
     }
 }
diff --git a/t/op/lex_assign.t b/t/op/lex_assign.t
new file mode 100644
index 0000000000..d35f39c2c3
--- /dev/null
+++ b/t/op/lex_assign.t
@@ -0,0 +1,214 @@
+#!./perl
+
+BEGIN {
+    chdir 't' if -d 't';
+    @INC = '../lib';
+}
+
+umask 0;
+$xref = \ "";
+@a = (1..5);
+%h = (1..6);
+$aref = \@a;
+$href = \%h;
+open OP, qq{$^X -le 'print "aaa Ok ok" while \$i++ < 100'|};
+$chopit = 'aaaaaa';
+@chopar = (113 .. 119);
+$posstr = '123456';
+$cstr = 'aBcD.eF';
+pos $posstr = 3;
+$nn = $n = 2;
+sub subb {"in s"}
+
+@INPUT = <DATA>;
+print "1..", (scalar @INPUT), "\n";
+$ord = 0;
+
+sub wrn {"@_"}
+
+for (@INPUT) {
+  $ord++;
+  ($op, undef, $comment) = /^([^\#]+)(\#\s+(.*))?/;
+  $comment = $op unless defined $comment;
+  $op = "$op==$op" unless $op =~ /==/;
+  ($op, $expectop) = $op =~ /(.*)==(.*)/;
+  
+  $skip = ($op =~ /^'\?\?\?'/) ? "skip" : "not";
+  $integer = ($comment =~ /^i_/) ? "use integer" : '' ;
+  (print "#skipping $comment:\nok $ord\n"), next if $skip eq 'skip';
+  
+  eval <<EOE;
+  local \$SIG{__WARN__} = \\&wrn;
+  my \$a = 'fake';
+  $integer;
+  \$a = $op;
+  \$b = $expectop;
+  if (\$a ne \$b) {
+    print "# \$comment: got `\$a', expected `\$b'\n";
+    print "\$skip " if \$a ne \$b or \$skip eq 'skip';
+  }
+  print "ok \$ord\\n";
+EOE
+  if ($@) {
+    if ($@ =~ /is unimplemented/) {
+      print "# skipping $comment: unimplemented:\nok $ord\n";
+    } else {
+      warn $@;
+      print "not ok $ord\n";
+    }
+  }
+}
+__END__
+ref $xref			# ref
+ref $cstr			# ref nonref
+`ls`				# backtick
+`$undefed`			# backtick undef
+<*>				# glob
+<OP>				# readline
+'faked'				# rcatline
+(@z = (1 .. 3))			# aassign
+chop $chopit			# chop
+(chop (@x=@chopar))		# schop
+chomp $chopit			# chomp
+(chop (@x=@chopar))		# schomp
+pos $posstr			# pos
+pos $chopit			# pos returns undef
+$nn++==2			# postinc
+$nn++==3			# i_postinc
+$nn--==4			# postdec
+$nn--==3			# i_postdec
+$n ** $n			# pow
+$n * $n				# multiply
+$n * $n				# i_multiply
+$n / $n				# divide
+$n / $n				# i_divide
+$n % $n				# modulo
+$n % $n				# i_modulo
+$n x $n				# repeat
+$n + $n				# add
+$n + $n				# i_add
+$n - $n				# subtract
+$n - $n				# i_subtract
+$n . $n				# concat
+$n . $a=='2fake'		# concat with self
+"3$a"=='3fake'			# concat with self in stringify
+"$n"				# stringify
+$n << $n			# left_shift
+$n >> $n			# right_shift
+$n <=> $n			# ncmp
+$n <=> $n			# i_ncmp
+$n cmp $n			# scmp
+$n & $n				# bit_and
+$n ^ $n				# bit_xor
+$n | $n				# bit_or
+-$n				# negate
+-$n				# i_negate
+~$n				# complement
+atan2 $n,$n			# atan2
+sin $n				# sin
+cos $n				# cos
+'???'				# rand
+exp $n				# exp
+log $n				# log
+sqrt $n				# sqrt
+int $n				# int
+hex $n				# hex
+oct $n				# oct
+abs $n				# abs
+length $posstr			# length
+substr $posstr, 2, 2		# substr
+vec("abc",2,8)			# vec
+index $posstr, 2		# index
+rindex $posstr, 2		# rindex
+sprintf "%i%i", $n, $n		# sprintf
+ord $n				# ord
+chr $n				# chr
+crypt $n, $n			# crypt
+ucfirst ($cstr . "a")		# ucfirst padtmp
+ucfirst $cstr			# ucfirst
+lcfirst $cstr			# lcfirst
+uc $cstr			# uc
+lc $cstr			# lc
+quotemeta $cstr			# quotemeta
+@$aref				# rv2av
+@$undefed			# rv2av undef
+each %h==1			# each
+values %h			# values
+keys %h				# keys
+%$href				# rv2hv
+pack "C2", $n,$n		# pack
+split /a/, "abad"		# split
+join "a"; @a			# join
+push @a,3==6			# push
+unshift @aaa			# unshift
+reverse	@a			# reverse
+reverse	$cstr			# reverse - scal
+grep $_, 1,0,2,0,3		# grepwhile
+map "x$_", 1,0,2,0,3		# mapwhile
+subb()				# entersub
+caller				# caller
+warn "ignore this\n"		# warn
+'faked'				# die
+open BLAH, "<non-existent"	# open
+fileno STDERR			# fileno
+umask 0				# umask
+select STDOUT			# sselect
+select "","","",0		# select
+getc OP				# getc
+'???'				# read
+'???'				# sysread
+'???'				# syswrite
+'???'				# send
+'???'				# recv
+'???'				# tell
+'???'				# fcntl
+'???'				# ioctl
+'???'				# flock
+'???'				# accept
+'???'				# shutdown
+'???'				# ftsize
+'???'				# ftmtime
+'???'				# ftatime
+'???'				# ftctime
+chdir 'non-existent'		# chdir
+'???'				# chown
+'???'				# chroot
+unlink 'non-existent'		# unlink
+chmod 'non-existent'		# chmod
+utime 'non-existent'		# utime
+rename 'non-existent', 'non-existent1'	# rename
+link 'non-existent', 'non-existent1' # link
+symlink 'non-existent', 'non-existent1' # symlink
+readlink 'non-existent', 'non-existent1' # readlink
+'???'				# mkdir
+'???'				# rmdir
+'???'				# telldir
+'???'				# fork
+'???'				# wait
+'???'				# waitpid
+system 'sh -c true'		# system
+'???'				# exec
+kill 0, $$			# kill
+getppid				# getppid
+getpgrp				# getpgrp
+'???'				# setpgrp
+getpriority $$, $$		# getpriority
+'???'				# setpriority
+time				# time
+localtime			# localtime
+gmtime				# gmtime
+sleep 1				# sleep
+'???'				# alarm
+'???'				# shmget
+'???'				# shmctl
+'???'				# shmread
+'???'				# shmwrite
+'???'				# msgget
+'???'				# msgctl
+'???'				# msgsnd
+'???'				# msgrcv
+'???'				# semget
+'???'				# semctl
+'???'				# semop
+'???'				# getlogin
+'???'				# syscall
diff --git a/t/op/magic.t b/t/op/magic.t
index a050510f38..f12f67b66c 100755
--- a/t/op/magic.t
+++ b/t/op/magic.t
@@ -7,7 +7,7 @@ BEGIN {
     $| = 1;
     chdir 't' if -d 't';
     @INC = '../lib';
-    $SIG{__WARN__} = sub { die @_ };
+    $SIG{__WARN__} = sub { die "dying on warning: ", @_ };
 }
 
 sub ok {
@@ -107,9 +107,11 @@ ok 21, close(SCRIPT), $!;
 ok 22, chmod(0755, $script), $!;
 $s = "\$^X is ./perl, \$0 is $script\n";
 $_ = `$script`;
-ok 23, $_ eq $s, ":$_:";
+ok 23, $_ eq $s, ":$_:!=:$s:"				     if $^O ne 'os2';
+# Started by ksh, which sets adds suffixes '.exe' and '.' to perl and script :
+ok 23, $_ eq "\$^X is ./perl.exe, \$0 is $script.\n", ":$_:" if $^O eq 'os2';
 $_ = `./perl $script`;
-ok 24, $_ eq $s, ":$_:";
+ok 24, $_ eq $s, ":$_:!=:$s:";
 ok 25, unlink($script), $!;
 
 # $], $^O, $^T