#!./perl
-print "1..168\n";
+print "1..177\n";
#P = start of string Q = start of substr R = end of substr S = end of string
substr($x = "\x{100}\x{200}", 2, 0, "ab");
ok 168, $x eq "\x{100}\x{200}ab";
+substr($x = "\xFFb", 0, 0, "\x{100}\x{200}");
+ok 169, $x eq "\x{100}\x{200}\xFFb";
+
+substr($x = "\x{100}\x{200}", 0, 0, "\xFFb");
+ok 170, $x eq "\xFFb\x{100}\x{200}";
+
+substr($x = "\xFFb", 1, 0, "\x{100}\x{200}");
+ok 171, $x eq "\xFF\x{100}\x{200}b";
+
+substr($x = "\x{100}\x{200}", 1, 0, "\xFFb");
+ok 172, $x eq "\x{100}\xFFb\x{200}";
+
+substr($x = "\xFFb", 2, 0, "\x{100}\x{200}");
+ok 173, $x eq "\xFFb\x{100}\x{200}";
+
+substr($x = "\x{100}\x{200}", 2, 0, "\xFFb");
+ok 174, $x eq "\x{100}\x{200}\xFFb";
+
+# [perl #20933]
+{
+ my $s = "ab";
+ my @r;
+ $r[$_] = \ substr $s, $_, 1 for (0, 1);
+ ok 175, join("", map { $$_ } @r) eq "ab";
+}
+
+# [perl #23207]
+{
+ sub ss {
+ substr($_[0],0,1) ^= substr($_[0],1,1) ^=
+ substr($_[0],0,1) ^= substr($_[0],1,1);
+ }
+ my $x = my $y = 'AB'; ss $x; ss $y;
+ ok 176, $x eq $y;
+}
+
+# [perl #24605]
+{
+ my $x = "0123456789\x{500}";
+ my $y = substr $x, 4;
+ ok 177, substr($x, 7, 1) eq "7";
+}