10 is( join(':',@x), '1:2:3', 'join an array with character');
12 is( join('',1,2,3), '123', 'join list with no separator');
14 is( join(':',split(/ /,"1 2 3")), '1:2:3', 'join implicit array with character');
17 $f = join ',', 'b', $f, 'e';
18 is( $f, 'b,a,e', 'join list back to self, middle of list');
21 $f = join ',', $f, 'b', 'e';
22 is( $f, 'a,b,e', 'join list back to self, beginning of list');
25 $f = join $f, 'b', 'e', 'k';
26 is( $f, 'baeak', 'join back to self, self is join character');
28 # 7,8 check for multiple read of tied objects
30 sub TIESCALAR { my $x = 7; bless \$x };
31 sub FETCH { my $y = shift; $$y += 5 };
33 my $r = join ':', $t, 99, $t, 99;
34 main::is($r, '12:99:17:99', 'check for multiple read of tied objects, with separator');
35 $r = join '', $t, 99, $t, 99;
36 main::is($r, '22992799', 'check for multiple read of tied objects, w/o separator, and magic');
39 # 9,10 and for multiple read of undef
41 local ($^W, $SIG{__WARN__}) = ( 1, sub { $s+=4 } );
42 my $r = join ':', 'a', undef, $s, 'b', undef, $s, 'c';
43 is( $r, 'a::9:b::13:c', 'multiple read of undef, with separator');
44 my $r = join '', 'a', undef, $s, 'b', undef, $s, 'c';
45 is( $r, 'a17b21c', '... and without separator');
48 { my $s = join("", chr(0x1234), chr(0xff));
49 is( $s, "\x{1234}\x{ff}", 'join two characters with multiple bytes, get two characters');
52 { my $s = join(chr(0xff), chr(0x1234), "");
53 is( $s, "\x{1234}\x{ff}", 'high byte character as separator, 1 multi-byte character in front');
56 { my $s = join(chr(0x1234), chr(0xff), chr(0x2345));
57 is( $s, "\x{ff}\x{1234}\x{2345}", 'multibyte character as separator');
60 { my $s = join(chr(0xff), chr(0x1234), chr(0xfe));
61 is( $s, "\x{1234}\x{ff}\x{fe}", 'high byte as separator, multi-byte and high byte list');
64 { # [perl #24846] $jb2 should be in bytes, not in utf8.
66 my $u = "abc\x{0100}";
68 sub join_into_my_variable {
75 return $_[0] eq $_[1] ? pass($_[2]) : fail($_[2]);
78 my $jb1 = join_into_my_variable("", $b);
79 my $ju1 = join_into_my_variable("", $u);
80 my $jb2 = join_into_my_variable("", $b);
81 my $ju2 = join_into_my_variable("", $u);
83 note( 'utf8 and byte checks, perl #24846' );