[perl5.git] / t / op / local.t

#!./perl

BEGIN {
    chdir 't' if -d 't';
    require './test.pl';
}
plan tests => 114;

my $list_assignment_supported = 1;

#mg.c says list assignment not supported on VMS, EPOC, and SYMBIAN.
$list_assignment_supported = 0 if ($^O eq 'VMS');


sub foo {
    local($a, $b) = @_;
    local($c, $d);
    $c = "c 3";
    $d = "d 4";
    { local($a,$c) = ("a 9", "c 10"); ($x, $y) = ($a, $c); }
    is($a, "a 1");
    is($b, "b 2");
    $c, $d;
}

$a = "a 5";
$b = "b 6";
$c = "c 7";
$d = "d 8";

my @res;
@res =  &foo("a 1","b 2");
is($res[0], "c 3");
is($res[1], "d 4");

is($a, "a 5");
is($b, "b 6");
is($c, "c 7");
is($d, "d 8");
is($x, "a 9");
is($y, "c 10");

# same thing, only with arrays and associative arrays

sub foo2 {
    local($a, @b) = @_;
    local(@c, %d);
    @c = "c 3";
    $d{''} = "d 4";
    { local($a,@c) = ("a 19", "c 20"); ($x, $y) = ($a, @c); }
    is($a, "a 1");
    is("@b", "b 2");
    $c[0], $d{''};
}

$a = "a 5";
@b = "b 6";
@c = "c 7";
$d{''} = "d 8";

@res = &foo2("a 1","b 2");
is($res[0], "c 3");
is($res[1], "d 4");

is($a, "a 5");
is("@b", "b 6");
is($c[0], "c 7");
is($d{''}, "d 8");
is($x, "a 19");
is($y, "c 20");


eval 'local($$e)';
like($@, qr/Can't localize through a reference/);

eval '$e = []; local(@$e)';
like($@, qr/Can't localize through a reference/);

eval '$e = {}; local(%$e)';
like($@, qr/Can't localize through a reference/);

# Array and hash elements

@a = ('a', 'b', 'c');
{
    local($a[1]) = 'foo';
    local($a[2]) = $a[2];
    is($a[1], 'foo');
    is($a[2], 'c');
    undef @a;
}
is($a[1], 'b');
is($a[2], 'c');
ok(!defined $a[0]);

@a = ('a', 'b', 'c');
{
    local($a[1]) = "X";
    shift @a;
}
is($a[0].$a[1], "Xb");
{
    my $d = "@a";
    local @a = @a;
    is("@a", $d);
}

%h = ('a' => 1, 'b' => 2, 'c' => 3);
{
    local($h{'a'}) = 'foo';
    local($h{'b'}) = $h{'b'};
    is($h{'a'}, 'foo');
    is($h{'b'}, 2);
    local($h{'c'});
    delete $h{'c'};
}
is($h{'a'}, 1);
is($h{'b'}, 2);
{
    my $d = join("\n", map { "$_=>$h{$_}" } sort keys %h);
    local %h = %h;
    is(join("\n", map { "$_=>$h{$_}" } sort keys %h), $d);
}
is($h{'c'}, 3);

# check for scope leakage
$a = 'outer';
if (1) { local $a = 'inner' }
is($a, 'outer');

# see if localization works when scope unwinds
local $m = 5;
eval {
    for $m (6) {
	local $m = 7;
	die "bye";
    }
};
is($m, 5);

# see if localization works on tied arrays
{
    package TA;
    sub TIEARRAY { bless [], $_[0] }
    sub STORE { print "# STORE [@_]\n"; $_[0]->[$_[1]] = $_[2] }
    sub FETCH { my $v = $_[0]->[$_[1]]; print "# FETCH [@_=$v]\n"; $v }
    sub CLEAR { print "# CLEAR [@_]\n"; @{$_[0]} = (); }
    sub FETCHSIZE { scalar(@{$_[0]}) }
    sub SHIFT { shift (@{$_[0]}) }
    sub EXTEND {}
}

tie @a, 'TA';
@a = ('a', 'b', 'c');
{
    local($a[1]) = 'foo';
    local($a[2]) = $a[2];
    is($a[1], 'foo');
    is($a[2], 'c');
    @a = ();
}
is($a[1], 'b');
is($a[2], 'c');
ok(!defined $a[0]);
{
    my $d = "@a";
    local @a = @a;
    is("@a", $d);
}

{
    package TH;
    sub TIEHASH { bless {}, $_[0] }
    sub STORE { print "# STORE [@_]\n"; $_[0]->{$_[1]} = $_[2] }
    sub FETCH { my $v = $_[0]->{$_[1]}; print "# FETCH [@_=$v]\n"; $v }
    sub EXISTS { print "# EXISTS [@_]\n"; exists $_[0]->{$_[1]}; }
    sub DELETE { print "# DELETE [@_]\n"; delete $_[0]->{$_[1]}; }
    sub CLEAR { print "# CLEAR [@_]\n"; %{$_[0]} = (); }
    sub FIRSTKEY { print "# FIRSTKEY [@_]\n"; keys %{$_[0]}; each %{$_[0]} }
    sub NEXTKEY { print "# NEXTKEY [@_]\n"; each %{$_[0]} }
}

# see if localization works on tied hashes
tie %h, 'TH';
%h = ('a' => 1, 'b' => 2, 'c' => 3);

{
    local($h{'a'}) = 'foo';
    local($h{'b'}) = $h{'b'};
    local($h{'y'});
    local($h{'z'}) = 33;
    is($h{'a'}, 'foo');
    is($h{'b'}, 2);
    local($h{'c'});
    delete $h{'c'};
}
is($h{'a'}, 1);
is($h{'b'}, 2);
is($h{'c'}, 3);
# local() should preserve the existenceness of tied hash elements
ok(! exists $h{'y'});
ok(! exists $h{'z'});
TODO: {
    todo_skip("Localize entire tied hash");
    my $d = join("\n", map { "$_=>$h{$_}" } sort keys %h);
    local %h = %h;
    is(join("\n", map { "$_=>$h{$_}" } sort keys %h), $d);
}

@a = ('a', 'b', 'c');
{
    local($a[1]) = "X";
    shift @a;
}
is($a[0].$a[1], "Xb");

# now try the same for %SIG

$SIG{TERM} = 'foo';
$SIG{INT} = \&foo;
$SIG{__WARN__} = $SIG{INT};
{
    local($SIG{TERM}) = $SIG{TERM};
    local($SIG{INT}) = $SIG{INT};
    local($SIG{__WARN__}) = $SIG{__WARN__};
    is($SIG{TERM}, 'main::foo');
    is($SIG{INT}, \&foo);
    is($SIG{__WARN__}, \&foo);
    local($SIG{INT});
    delete $SIG{__WARN__};
}
is($SIG{TERM}, 'main::foo');
is($SIG{INT}, \&foo);
is($SIG{__WARN__}, \&foo);
{
    my $d = join("\n", map { "$_=>$SIG{$_}" } sort keys %SIG);
    local %SIG = %SIG;
    is(join("\n", map { "$_=>$SIG{$_}" } sort keys %SIG), $d);
}

# and for %ENV

$ENV{_X_} = 'a';
$ENV{_Y_} = 'b';
$ENV{_Z_} = 'c';
{
    local($ENV{_A_});
    local($ENV{_B_}) = 'foo';
    local($ENV{_X_}) = 'foo';
    local($ENV{_Y_}) = $ENV{_Y_};
    is($ENV{_X_}, 'foo');
    is($ENV{_Y_}, 'b');
    local($ENV{_Z_});
    delete $ENV{_Z_};
}
is($ENV{_X_}, 'a');
is($ENV{_Y_}, 'b');
is($ENV{_Z_}, 'c');
# local() should preserve the existenceness of %ENV elements
ok(! exists $ENV{_A_});
ok(! exists $ENV{_B_});

SKIP: {
    skip("Can't make list assignment to \%ENV on this system")
	unless $list_assignment_supported;
    my $d = join("\n", map { "$_=>$ENV{$_}" } sort keys %ENV);
    local %ENV = %ENV;
    is(join("\n", map { "$_=>$ENV{$_}" } sort keys %ENV), $d);
}

# does implicit localization in foreach skip magic?

$_ = "o 0,o 1,";
my $iter = 0;
while (/(o.+?),/gc) {
    is($1, "o $iter");
    foreach (1..1) { $iter++ }
    if ($iter > 2) { fail("endless loop"); last; }
}

{
    package UnderScore;
    sub TIESCALAR { bless \my $self, shift }
    sub FETCH { die "read  \$_ forbidden" }
    sub STORE { die "write \$_ forbidden" }
    tie $_, __PACKAGE__;
    my @tests = (
	"Nesting"     => sub { print '#'; for (1..3) { print }
			       print "\n" },			1,
	"Reading"     => sub { print },				0,
	"Matching"    => sub { $x = /badness/ },		0,
	"Concat"      => sub { $_ .= "a" },			0,
	"Chop"        => sub { chop },				0,
	"Filetest"    => sub { -x },				0,
	"Assignment"  => sub { $_ = "Bad" },			0,
	# XXX whether next one should fail is debatable
	"Local \$_"   => sub { local $_  = 'ok?'; print },	0,
	"for local"   => sub { for("#ok?\n"){ print } },	1,
    );
    while ( ($name, $code, $ok) = splice(@tests, 0, 3) ) {
	eval { &$code };
        main::ok(($ok xor $@), "Underscore '$name'");
    }
    untie $_;
}

{
    # BUG 20001205.22
    my %x;
    $x{a} = 1;
    { local $x{b} = 1; }
    ok(! exists $x{b});
    { local @x{c,d,e}; }
    ok(! exists $x{c});
}

# local() and readonly magic variables

eval { local $1 = 1 };
like($@, qr/Modification of a read-only value attempted/);

eval { for ($1) { local $_ = 1 } };
like($@, qr/Modification of a read-only value attempted/);

# make sure $1 is still read-only
eval { for ($1) { local $_ = 1 } };
like($@, qr/Modification of a read-only value attempted/);

# The s/// adds 'g' magic to $_, but it should remain non-readonly
eval { for("a") { for $x (1,2) { local $_="b"; s/(.*)/+$1/ } } };
is($@, "");

# Special local() behavior for $[
# (see RT #38207 - Useless localization of constant ($[) in getopts.pl}
{
    local $[ = 1;
    local $TODO = "local() not currently working correctly with \$[";
    ok(1 == $[);
    undef $TODO;
    f();
}

sub f { ok(0 == $[); }

# sub localisation
{
	package Other;

	sub f1 { "f1" }
	sub f2 { "f2" }

	no warnings "redefine";
	{
		local *f1 = sub  { "g1" };
		::ok(f1() eq "g1", "localised sub via glob");
	}
	::ok(f1() eq "f1", "localised sub restored");
	{
		local $Other::{"f1"} = sub { "h1" };
		::ok(f1() eq "h1", "localised sub via stash");
	}
	::ok(f1() eq "f1", "localised sub restored");
	{
		local @Other::{qw/ f1 f2 /} = (sub { "j1" }, sub { "j2" });
		::ok(f1() eq "j1", "localised sub via stash slice");
		::ok(f2() eq "j2", "localised sub via stash slice");
	}
	::ok(f1() eq "f1", "localised sub restored");
	::ok(f2() eq "f2", "localised sub restored");
}

# Localising unicode keys (bug #38815)
{
    my %h;
    $h{"\243"} = "pound";
    $h{"\302\240"} = "octects";
    is(scalar keys %h, 2);
    {
	my $unicode = chr 256;
	my $ambigous = "\240" . $unicode;
	chop $ambigous;
	local $h{$unicode} = 256;
	local $h{$ambigous} = 160;

	is(scalar keys %h, 4);
	is($h{"\243"}, "pound");
	is($h{$unicode}, 256);
	is($h{$ambigous}, 160);
	is($h{"\302\240"}, "octects");
    }
    is(scalar keys %h, 2);
    is($h{"\243"}, "pound");
    is($h{"\302\240"}, "octects");
}

# And with slices
{
    my %h;
    $h{"\243"} = "pound";
    $h{"\302\240"} = "octects";
    is(scalar keys %h, 2);
    {
	my $unicode = chr 256;
	my $ambigous = "\240" . $unicode;
	chop $ambigous;
	local @h{$unicode, $ambigous} = (256, 160);

	is(scalar keys %h, 4);
	is($h{"\243"}, "pound");
	is($h{$unicode}, 256);
	is($h{$ambigous}, 160);
	is($h{"\302\240"}, "octects");
    }
    is(scalar keys %h, 2);
    is($h{"\243"}, "pound");
    is($h{"\302\240"}, "octects");
}

# [perl #39012] localizing @_ element then shifting frees element too # soon

{
    my $x;
    my $y = bless [], 'X39012';
    sub X39012::DESTROY { $x++ }
    sub { local $_[0]; shift }->($y);
    ok(!$x,  '[perl #39012]');
    
}
Commit	Line	Data
a687059c LW	1	#!./perl
a687059c LW	2
d441d3db RD	3	BEGIN {
	4	chdir 't' if -d 't';
	5	require './test.pl';
	6	}
658aef79	7	plan tests => 114;
a687059c	8
13414bd5 JM	9	my $list_assignment_supported = 1;
	10
	11	#mg.c says list assignment not supported on VMS, EPOC, and SYMBIAN.
	12	$list_assignment_supported = 0 if ($^O eq 'VMS');
	13
	14
a687059c LW	15	sub foo {
	16	local($a, $b) = @_;
	17	local($c, $d);
d441d3db RD	18	$c = "c 3";
	19	$d = "d 4";
	20	{ local($a,$c) = ("a 9", "c 10"); ($x, $y) = ($a, $c); }
	21	is($a, "a 1");
	22	is($b, "b 2");
	23	$c, $d;
a687059c LW	24	}
a687059c LW	25
d441d3db RD	26	$a = "a 5";
	27	$b = "b 6";
	28	$c = "c 7";
	29	$d = "d 8";
a687059c	30
d441d3db RD	31	my @res;
	32	@res = &foo("a 1","b 2");
	33	is($res[0], "c 3");
	34	is($res[1], "d 4");
a687059c	35
d441d3db RD	36	is($a, "a 5");
	37	is($b, "b 6");
	38	is($c, "c 7");
	39	is($d, "d 8");
	40	is($x, "a 9");
	41	is($y, "c 10");
a687059c LW	42
	43	# same thing, only with arrays and associative arrays
	44
	45	sub foo2 {
	46	local($a, @b) = @_;
	47	local(@c, %d);
d441d3db RD	48	@c = "c 3";
	49	$d{''} = "d 4";
	50	{ local($a,@c) = ("a 19", "c 20"); ($x, $y) = ($a, @c); }
	51	is($a, "a 1");
	52	is("@b", "b 2");
	53	$c[0], $d{''};
a687059c LW	54	}
a687059c LW	55
d441d3db RD	56	$a = "a 5";
	57	@b = "b 6";
	58	@c = "c 7";
	59	$d{''} = "d 8";
	60
	61	@res = &foo2("a 1","b 2");
	62	is($res[0], "c 3");
	63	is($res[1], "d 4");
a687059c	64
d441d3db RD	65	is($a, "a 5");
	66	is("@b", "b 6");
	67	is($c[0], "c 7");
	68	is($d{''}, "d 8");
	69	is($x, "a 19");
	70	is($y, "c 20");
a687059c	71
706a304b SM	72
706a304b SM	73	eval 'local($$e)';
d441d3db	74	like($@, qr/Can't localize through a reference/);
706a304b	75
82d03984	76	eval '$e = []; local(@$e)';
d441d3db	77	like($@, qr/Can't localize through a reference/);
706a304b	78
82d03984	79	eval '$e = {}; local(%$e)';
d441d3db	80	like($@, qr/Can't localize through a reference/);
85aff577	81
161b7d16 SM	82	# Array and hash elements
	83
	84	@a = ('a', 'b', 'c');
	85	{
	86	local($a[1]) = 'foo';
	87	local($a[2]) = $a[2];
d441d3db RD	88	is($a[1], 'foo');
d441d3db RD	89	is($a[2], 'c');
161b7d16 SM	90	undef @a;
161b7d16 SM	91	}
d441d3db RD	92	is($a[1], 'b');
	93	is($a[2], 'c');
	94	ok(!defined $a[0]);
161b7d16 SM	95
	96	@a = ('a', 'b', 'c');
	97	{
	98	local($a[1]) = "X";
	99	shift @a;
	100	}
d441d3db	101	is($a[0].$a[1], "Xb");
d60c5a05 RD	102	{
	103	my $d = "@a";
	104	local @a = @a;
	105	is("@a", $d);
	106	}
161b7d16 SM	107
	108	%h = ('a' => 1, 'b' => 2, 'c' => 3);
	109	{
	110	local($h{'a'}) = 'foo';
	111	local($h{'b'}) = $h{'b'};
d441d3db RD	112	is($h{'a'}, 'foo');
d441d3db RD	113	is($h{'b'}, 2);
161b7d16 SM	114	local($h{'c'});
	115	delete $h{'c'};
	116	}
d441d3db RD	117	is($h{'a'}, 1);
d441d3db RD	118	is($h{'b'}, 2);
d60c5a05 RD	119	{
	120	my $d = join("\n", map { "$_=>$h{$_}" } sort keys %h);
	121	local %h = %h;
	122	is(join("\n", map { "$_=>$h{$_}" } sort keys %h), $d);
	123	}
d441d3db	124	is($h{'c'}, 3);
2bb40b7f GS	125
	126	# check for scope leakage
	127	$a = 'outer';
	128	if (1) { local $a = 'inner' }
d441d3db	129	is($a, 'outer');
2bb40b7f GS	130
	131	# see if localization works when scope unwinds
	132	local $m = 5;
	133	eval {
	134	for $m (6) {
	135	local $m = 7;
	136	die "bye";
	137	}
	138	};
d441d3db	139	is($m, 5);
4e4c362e GS	140
	141	# see if localization works on tied arrays
	142	{
	143	package TA;
	144	sub TIEARRAY { bless [], $_[0] }
	145	sub STORE { print "# STORE [@_]\n"; $_[0]->[$_[1]] = $_[2] }
	146	sub FETCH { my $v = $_[0]->[$_[1]]; print "# FETCH [@_=$v]\n"; $v }
	147	sub CLEAR { print "# CLEAR [@_]\n"; @{$_[0]} = (); }
	148	sub FETCHSIZE { scalar(@{$_[0]}) }
	149	sub SHIFT { shift (@{$_[0]}) }
	150	sub EXTEND {}
	151	}
	152
	153	tie @a, 'TA';
	154	@a = ('a', 'b', 'c');
	155	{
	156	local($a[1]) = 'foo';
be6c24e0	157	local($a[2]) = $a[2];
d441d3db RD	158	is($a[1], 'foo');
d441d3db RD	159	is($a[2], 'c');
4e4c362e GS	160	@a = ();
4e4c362e GS	161	}
d441d3db RD	162	is($a[1], 'b');
	163	is($a[2], 'c');
	164	ok(!defined $a[0]);
d60c5a05 RD	165	{
	166	my $d = "@a";
	167	local @a = @a;
	168	is("@a", $d);
	169	}
4e4c362e GS	170
	171	{
	172	package TH;
	173	sub TIEHASH { bless {}, $_[0] }
	174	sub STORE { print "# STORE [@_]\n"; $_[0]->{$_[1]} = $_[2] }
	175	sub FETCH { my $v = $_[0]->{$_[1]}; print "# FETCH [@_=$v]\n"; $v }
c39e6ab0	176	sub EXISTS { print "# EXISTS [@_]\n"; exists $_[0]->{$_[1]}; }
4e4c362e GS	177	sub DELETE { print "# DELETE [@_]\n"; delete $_[0]->{$_[1]}; }
4e4c362e GS	178	sub CLEAR { print "# CLEAR [@_]\n"; %{$_[0]} = (); }
d60c5a05 RD	179	sub FIRSTKEY { print "# FIRSTKEY [@_]\n"; keys %{$_[0]}; each %{$_[0]} }
d60c5a05 RD	180	sub NEXTKEY { print "# NEXTKEY [@_]\n"; each %{$_[0]} }
4e4c362e GS	181	}
	182
	183	# see if localization works on tied hashes
	184	tie %h, 'TH';
	185	%h = ('a' => 1, 'b' => 2, 'c' => 3);
	186
	187	{
	188	local($h{'a'}) = 'foo';
be6c24e0	189	local($h{'b'}) = $h{'b'};
159ad915 DM	190	local($h{'y'});
159ad915 DM	191	local($h{'z'}) = 33;
d441d3db RD	192	is($h{'a'}, 'foo');
d441d3db RD	193	is($h{'b'}, 2);
4e4c362e GS	194	local($h{'c'});
	195	delete $h{'c'};
	196	}
d441d3db RD	197	is($h{'a'}, 1);
	198	is($h{'b'}, 2);
	199	is($h{'c'}, 3);
	200	# local() should preserve the existenceness of tied hash elements
	201	ok(! exists $h{'y'});
	202	ok(! exists $h{'z'});
d60c5a05 RD	203	TODO: {
	204	todo_skip("Localize entire tied hash");
	205	my $d = join("\n", map { "$_=>$h{$_}" } sort keys %h);
	206	local %h = %h;
	207	is(join("\n", map { "$_=>$h{$_}" } sort keys %h), $d);
	208	}
4e4c362e GS	209
	210	@a = ('a', 'b', 'c');
	211	{
	212	local($a[1]) = "X";
	213	shift @a;
	214	}
d441d3db	215	is($a[0].$a[1], "Xb");
4e4c362e	216
be6c24e0 GS	217	# now try the same for %SIG
	218
	219	$SIG{TERM} = 'foo';
	220	$SIG{INT} = \&foo;
	221	$SIG{__WARN__} = $SIG{INT};
	222	{
	223	local($SIG{TERM}) = $SIG{TERM};
	224	local($SIG{INT}) = $SIG{INT};
	225	local($SIG{__WARN__}) = $SIG{__WARN__};
d441d3db RD	226	is($SIG{TERM}, 'main::foo');
	227	is($SIG{INT}, \&foo);
	228	is($SIG{__WARN__}, \&foo);
be6c24e0 GS	229	local($SIG{INT});
	230	delete $SIG{__WARN__};
	231	}
d441d3db RD	232	is($SIG{TERM}, 'main::foo');
	233	is($SIG{INT}, \&foo);
	234	is($SIG{__WARN__}, \&foo);
d60c5a05 RD	235	{
	236	my $d = join("\n", map { "$_=>$SIG{$_}" } sort keys %SIG);
	237	local %SIG = %SIG;
	238	is(join("\n", map { "$_=>$SIG{$_}" } sort keys %SIG), $d);
	239	}
be6c24e0 GS	240
	241	# and for %ENV
	242
	243	$ENV{_X_} = 'a';
	244	$ENV{_Y_} = 'b';
	245	$ENV{_Z_} = 'c';
	246	{
159ad915 DM	247	local($ENV{_A_});
159ad915 DM	248	local($ENV{_B_}) = 'foo';
be6c24e0 GS	249	local($ENV{_X_}) = 'foo';
be6c24e0 GS	250	local($ENV{_Y_}) = $ENV{_Y_};
d441d3db RD	251	is($ENV{_X_}, 'foo');
d441d3db RD	252	is($ENV{_Y_}, 'b');
be6c24e0 GS	253	local($ENV{_Z_});
	254	delete $ENV{_Z_};
	255	}
d441d3db RD	256	is($ENV{_X_}, 'a');
	257	is($ENV{_Y_}, 'b');
	258	is($ENV{_Z_}, 'c');
	259	# local() should preserve the existenceness of %ENV elements
	260	ok(! exists $ENV{_A_});
	261	ok(! exists $ENV{_B_});
13414bd5 JM	262
	263	SKIP: {
	264	skip("Can't make list assignment to \%ENV on this system")
	265	unless $list_assignment_supported;
d60c5a05 RD	266	my $d = join("\n", map { "$_=>$ENV{$_}" } sort keys %ENV);
	267	local %ENV = %ENV;
	268	is(join("\n", map { "$_=>$ENV{$_}" } sort keys %ENV), $d);
	269	}
be6c24e0	270
0214ae40 GS	271	# does implicit localization in foreach skip magic?
0214ae40 GS	272
d441d3db	273	$_ = "o 0,o 1,";
0214ae40 GS	274	my $iter = 0;
0214ae40 GS	275	while (/(o.+?),/gc) {
d441d3db	276	is($1, "o $iter");
0214ae40	277	foreach (1..1) { $iter++ }
d441d3db	278	if ($iter > 2) { fail("endless loop"); last; }
0214ae40 GS	279	}
	280
	281	{
	282	package UnderScore;
	283	sub TIESCALAR { bless \my $self, shift }
	284	sub FETCH { die "read \$_ forbidden" }
	285	sub STORE { die "write \$_ forbidden" }
	286	tie $_, __PACKAGE__;
0214ae40 GS	287	my @tests = (
	288	"Nesting" => sub { print '#'; for (1..3) { print }
	289	print "\n" }, 1,
	290	"Reading" => sub { print }, 0,
	291	"Matching" => sub { $x = /badness/ }, 0,
	292	"Concat" => sub { $_ .= "a" }, 0,
	293	"Chop" => sub { chop }, 0,
	294	"Filetest" => sub { -x }, 0,
	295	"Assignment" => sub { $_ = "Bad" }, 0,
	296	# XXX whether next one should fail is debatable
	297	"Local \$_" => sub { local $_ = 'ok?'; print }, 0,
	298	"for local" => sub { for("#ok?\n"){ print } }, 1,
	299	);
	300	while ( ($name, $code, $ok) = splice(@tests, 0, 3) ) {
0214ae40	301	eval { &$code };
d441d3db	302	main::ok(($ok xor $@), "Underscore '$name'");
0214ae40 GS	303	}
	304	untie $_;
	305	}
	306
1f5346dc SC	307	{
	308	# BUG 20001205.22
	309	my %x;
	310	$x{a} = 1;
	311	{ local $x{b} = 1; }
d441d3db	312	ok(! exists $x{b});
1f5346dc	313	{ local @x{c,d,e}; }
d441d3db	314	ok(! exists $x{c});
1f5346dc	315	}
159ad915	316
33f3c7b8 RGS	317	# local() and readonly magic variables
	318
	319	eval { local $1 = 1 };
d441d3db	320	like($@, qr/Modification of a read-only value attempted/);
33f3c7b8 RGS	321
33f3c7b8 RGS	322	eval { for ($1) { local $_ = 1 } };
d441d3db	323	like($@, qr/Modification of a read-only value attempted/);
33f3c7b8	324
0cbee0a4	325	# make sure $1 is still read-only
33f3c7b8	326	eval { for ($1) { local $_ = 1 } };
d441d3db	327	like($@, qr/Modification of a read-only value attempted/);
ac117f44 RGS	328
	329	# The s/// adds 'g' magic to $_, but it should remain non-readonly
	330	eval { for("a") { for $x (1,2) { local $_="b"; s/(.*)/+$1/ } } };
d441d3db	331	is($@, "");
4cb09e0a SP	332
	333	# Special local() behavior for $[
	334	# (see RT #38207 - Useless localization of constant ($[) in getopts.pl}
	335	{
	336	local $[ = 1;
	337	local $TODO = "local() not currently working correctly with \$[";
	338	ok(1 == $[);
	339	undef $TODO;
	340	f();
	341	}
	342
	343	sub f { ok(0 == $[); }
	344
985d6f61 HS	345	# sub localisation
	346	{
	347	package Other;
	348
	349	sub f1 { "f1" }
	350	sub f2 { "f2" }
	351
	352	no warnings "redefine";
	353	{
	354	local *f1 = sub { "g1" };
	355	::ok(f1() eq "g1", "localised sub via glob");
	356	}
	357	::ok(f1() eq "f1", "localised sub restored");
	358	{
	359	local $Other::{"f1"} = sub { "h1" };
	360	::ok(f1() eq "h1", "localised sub via stash");
	361	}
	362	::ok(f1() eq "f1", "localised sub restored");
	363	{
	364	local @Other::{qw/ f1 f2 /} = (sub { "j1" }, sub { "j2" });
985d6f61 HS	365	::ok(f1() eq "j1", "localised sub via stash slice");
985d6f61 HS	366	::ok(f2() eq "j2", "localised sub via stash slice");
985d6f61 HS	367	}
	368	::ok(f1() eq "f1", "localised sub restored");
	369	::ok(f2() eq "f2", "localised sub restored");
	370	}
7d654f43 NC	371
	372	# Localising unicode keys (bug #38815)
	373	{
	374	my %h;
	375	$h{"\243"} = "pound";
	376	$h{"\302\240"} = "octects";
	377	is(scalar keys %h, 2);
	378	{
	379	my $unicode = chr 256;
	380	my $ambigous = "\240" . $unicode;
	381	chop $ambigous;
	382	local $h{$unicode} = 256;
	383	local $h{$ambigous} = 160;
	384
	385	is(scalar keys %h, 4);
	386	is($h{"\243"}, "pound");
	387	is($h{$unicode}, 256);
	388	is($h{$ambigous}, 160);
	389	is($h{"\302\240"}, "octects");
	390	}
	391	is(scalar keys %h, 2);
	392	is($h{"\243"}, "pound");
	393	is($h{"\302\240"}, "octects");
	394	}
919acde0 NC	395
	396	# And with slices
	397	{
	398	my %h;
	399	$h{"\243"} = "pound";
	400	$h{"\302\240"} = "octects";
	401	is(scalar keys %h, 2);
	402	{
	403	my $unicode = chr 256;
	404	my $ambigous = "\240" . $unicode;
	405	chop $ambigous;
	406	local @h{$unicode, $ambigous} = (256, 160);
	407
	408	is(scalar keys %h, 4);
	409	is($h{"\243"}, "pound");
	410	is($h{$unicode}, 256);
	411	is($h{$ambigous}, 160);
	412	is($h{"\302\240"}, "octects");
	413	}
	414	is(scalar keys %h, 2);
	415	is($h{"\243"}, "pound");
	416	is($h{"\302\240"}, "octects");
	417	}
658aef79 DM	418
	419	# [perl #39012] localizing @_ element then shifting frees element too # soon
	420
	421	{
	422	my $x;
	423	my $y = bless [], 'X39012';
	424	sub X39012::DESTROY { $x++ }
	425	sub { local $_[0]; shift }->($y);
	426	ok(!$x, '[perl #39012]');
	427
	428	}
	429