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diff --git a/t/op/repeat.t b/t/op/repeat.t
old mode 100644
new mode 100755
index a494b99..e728413
--- a/t/op/repeat.t
+++ b/t/op/repeat.t
@@ -1,42 +1,153 @@
 #!./perl
 
-# $Header: repeat.t,v 4.0 91/03/20 01:54:26 lwall Locked $
+BEGIN {
+    chdir 't' if -d 't';
+    @INC = '../lib';
+}
 
-print "1..19\n";
+require './test.pl';
+plan(tests => 41);
 
 # compile time
 
-if ('-' x 5 eq '-----') {print "ok 1\n";} else {print "not ok 1\n";}
-if ('-' x 1 eq '-') {print "ok 2\n";} else {print "not ok 2\n";}
-if ('-' x 0 eq '') {print "ok 3\n";} else {print "not ok 3\n";}
+is('-' x 5, '-----',    'compile time x');
+is('-' x 3.1, '---',    'compile time 3.1');
+is('-' x 3.9, '---',    'compile time 3.9');
+is('-' x 1, '-',        '  x 1');
+is('-' x 0, '',         '  x 0');
+is('-' x -1, '',        '  x -1');
+is('-' x undef, '',     '  x undef');
+is('-' x "foo", '',     '  x "foo"');
+is('-' x "3rd", '---',  '  x "3rd"');
 
-if ('ab' x 3 eq 'ababab') {print "ok 4\n";} else {print "not ok 4\n";}
+is('ab' x 3, 'ababab',  '  more than one char');
 
 # run time
 
 $a = '-';
-if ($a x 5 eq '-----') {print "ok 5\n";} else {print "not ok 5\n";}
-if ($a x 1 eq '-') {print "ok 6\n";} else {print "not ok 6\n";}
-if ($a x 0 eq '') {print "ok 7\n";} else {print "not ok 7\n";}
+is($a x 5, '-----',     'run time x');
+is($a x 3.1, '---',     '  x 3.1');
+is($a x 3.9, '---',     '  x 3.9');
+is($a x 1, '-',         '  x 1');
+is($a x 0, '',          '  x 0');
+is($a x -3, '',         '  x -3');
+is($a x undef, '',      '  x undef');
+is($a x "foo", '',      '  x "foo"');
+is($a x "3rd", '---',   '  x "3rd"');
 
 $a = 'ab';
-if ($a x 3 eq 'ababab') {print "ok 8\n";} else {print "not ok 8\n";}
+is($a x 3, 'ababab',    '  more than one char');
+$a = 'ab';
+is($a x 0, '',          '  more than one char');
+$a = 'ab';
+is($a x -12, '',        '  more than one char');
 
 $a = 'xyz';
 $a x= 2;
-if ($a eq 'xyzxyz') {print "ok 9\n";} else {print "not ok 9\n";}
+is($a, 'xyzxyz',        'x=2');
 $a x= 1;
-if ($a eq 'xyzxyz') {print "ok 10\n";} else {print "not ok 10\n";}
+is($a, 'xyzxyz',        'x=1');
 $a x= 0;
-if ($a eq '') {print "ok 11\n";} else {print "not ok 11\n";}
+is($a, '',              'x=0');
 
 @x = (1,2,3);
 
-print join('', @x x 4) eq '3333' ? "ok 12\n" : "not ok 12\n";
-print join('', (@x) x 4) eq '123123123123' ? "ok 13\n" : "not ok 13\n";
-print join('', (@x,()) x 4) eq '123123123123' ? "ok 14\n" : "not ok 14\n";
-print join('', (@x,1) x 4) eq '1231123112311231' ? "ok 15\n" : "not ok 15\n";
-print join(':', () x 4) eq '' ? "ok 16\n" : "not ok 16\n";
-print join(':', (9) x 4) eq '9:9:9:9' ? "ok 17\n" : "not ok 17\n";
-print join(':', (9,9) x 4) eq '9:9:9:9:9:9:9:9' ? "ok 18\n" : "not ok 18\n";
-print join('', (split(//,"123")) x 2) eq '123123' ? "ok 19\n" : "not ok 19\n";
+is(join('', @x x 4),        '3333',                 '@x x Y');
+is(join('', (@x) x 4),      '123123123123',         '(@x) x Y');
+is(join('', (@x,()) x 4),   '123123123123',         '(@x,()) x Y');
+is(join('', (@x,1) x 4),    '1231123112311231',     '(@x,1) x Y');
+is(join(':', () x 4),       '',                     '() x Y');
+is(join(':', (9) x 4),      '9:9:9:9',              '(X) x Y');
+is(join(':', (9,9) x 4),    '9:9:9:9:9:9:9:9',      '(X,X) x Y');
+is(join('', (split(//,"123")) x 2), '123123',       'split and x');
+
+is(join('', @x x -12),      '',                     '@x x -12');
+is(join('', (@x) x -14),    '',                     '(@x) x -14');
+
+
+# This test is actually testing for Digital C compiler optimizer bug,
+# present in Dec C versions 5.* and 6.0 (used in Digital UNIX and VMS),
+# found in December 1998.  The bug was reported to Digital^WCompaq as
+#     DECC 2745 (21-Dec-1998)
+# GEM_BUGS 7619 (23-Dec-1998)
+# As of April 1999 the bug has been fixed in Tru64 UNIX 5.0 and is planned
+# to be fixed also in 4.0G.
+#
+# The bug was as follows: broken code was produced for util.c:repeatcpy()
+# (a utility function for the 'x' operator) in the case *all* these
+# four conditions held:
+#
+# (1) len == 1
+# (2) "from" had the 8th bit on in its single character
+# (3) count > 7 (the 'x' count > 16)
+# (4) the highest optimization level was used in compilation
+#     (which is the default when compiling Perl)
+#
+# The bug looked like this (. being the eight-bit character and ? being \xff):
+#
+# 16 ................
+# 17 .........???????.
+# 18 .........???????..
+# 19 .........???????...
+# 20 .........???????....
+# 21 .........???????.....
+# 22 .........???????......
+# 23 .........???????.......
+# 24 .........???????.???????
+# 25 .........???????.???????.
+#
+# The bug was triggered in the "if (len == 1)" branch.  The fix
+# was to introduce a new temporary variable.  In diff -u format:
+#
+#     register char *frombase = from;
+# 
+#     if (len == 1) {
+#-       todo = *from;
+#+       register char c = *from;
+#        while (count-- > 0)
+#-           *to++ = todo;
+#+           *to++ = c;
+#        return;
+#     }
+#
+# The bug could also be (obscurely) avoided by changing "from" to
+# be an unsigned char pointer.
+#
+# This obscure bug was not found by the then test suite but instead
+# by Mark.Martinec@nsc.ijs.si while trying to install Digest-MD5-2.00.
+#
+# jhi@iki.fi
+#
+is("\xdd" x 24, "\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd\xdd", 'Dec C bug');
+
+
+# When we use a list repeat in a scalar context, it behaves like
+# a scalar repeat. Make sure that works properly, and doesn't leave
+# extraneous values on the stack.
+#  -- robin@kitsite.com
+
+my ($x, $y) = scalar ((1,2)x2);
+is($x, "22",    'list repeat in scalar context');
+is($y, undef,   '  no extra values on stack');
+
+# Make sure the stack doesn't get truncated too much - the left
+# operand of the eq binop needs to remain!
+is(77, scalar ((1,7)x2),    'stack truncation');
+
+
+# perlbug 20011113.110 works in 5.6.1, broken in 5.7.2
+{
+    my $x= [("foo") x 2];
+    is( join('', @$x), 'foofoo', 'list repeat in anon array ref broken [ID 20011113.110]' );
+}
+
+# [ID 20010809.028] x operator not copying elements in 'for' list?
+{
+    local $TODO = "x operator not copying elements in 'for' list? [ID 20010809.028]";
+    my $x = 'abcd';
+    my $y = '';
+    for (($x =~ /./g) x 2) {
+	$y .= chop;
+    }
+    is($y, 'abcdabcd');
+}