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

#!./perl

BEGIN {
    chdir 't' if -d 't';
    @INC = qw(. ../lib);
    require './test.pl';
}
plan tests => 310;

my $list_assignment_supported = 1;

#mg.c says list assignment not supported on VMS 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[4]) = 'x';
    ok(!defined $a[3]);
    is($a[4], 'x');
}
is(scalar(@a), 3);
ok(!exists $a[3]);
ok(!exists $a[4]);

@a = ('a', 'b', 'c');
{
    local($a[5]) = 'z';
    $a[4] = 'y';
    ok(!defined $a[3]);
    is($a[4], 'y');
    is($a[5], 'z');
}
is(scalar(@a), 5);
ok(!defined $a[3]);
is($a[4], 'y');
ok(!exists $a[5]);

@a = ('a', 'b', 'c');
{
    local(@a[4,6]) = ('x', 'z');
    ok(!defined $a[3]);
    is($a[4], 'x');
    ok(!defined $a[5]);
    is($a[6], 'z');
}
is(scalar(@a), 3);
ok(!exists $a[3]);
ok(!exists $a[4]);
ok(!exists $a[5]);
ok(!exists $a[6]);

@a = ('a', 'b', 'c');
{
    local(@a[4,6]) = ('x', 'z');
    $a[5] = 'y';
    ok(!defined $a[3]);
    is($a[4], 'x');
    is($a[5], 'y');
    is($a[6], 'z');
}
is(scalar(@a), 6);
ok(!defined $a[3]);
ok(!defined $a[4]);
is($a[5], 'y');
ok(!exists $a[6]);

@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);
}

@a = ('a', 'b', 'c');
$a[4] = 'd';
{
    delete local $a[1];
    is(scalar(@a), 5);
    is($a[0], 'a');
    ok(!exists($a[1]));
    is($a[2], 'c');
    ok(!exists($a[3]));
    is($a[4], 'd');

    ok(!exists($a[888]));
    delete local $a[888];
    is(scalar(@a), 5);
    ok(!exists($a[888]));

    ok(!exists($a[999]));
    my ($d, $zzz) = delete local @a[4, 999];
    is(scalar(@a), 3);
    ok(!exists($a[4]));
    ok(!exists($a[999]));
    is($d, 'd');
    is($zzz, undef);

    my $c = delete local $a[2];
    is(scalar(@a), 1);
    ok(!exists($a[2]));
    is($c, 'c');

    $a[888] = 'yyy';
    $a[999] = 'zzz';
}
is(scalar(@a), 5);
is($a[0], 'a');
is($a[1], 'b');
is($a[2], 'c');
ok(!defined($a[3]));
is($a[4], 'd');
ok(!exists($a[5]));
ok(!exists($a[888]));
ok(!exists($a[999]));

%h = (a => 1, b => 2, c => 3, d => 4);
{
    delete local $h{b};
    is(scalar(keys(%h)), 3);
    is($h{a}, 1);
    ok(!exists($h{b}));
    is($h{c}, 3);
    is($h{d}, 4);

    ok(!exists($h{yyy}));
    delete local $h{yyy};
    is(scalar(keys(%h)), 3);
    ok(!exists($h{yyy}));

    ok(!exists($h{zzz}));
    my ($d, $zzz) = delete local @h{qw/d zzz/};
    is(scalar(keys(%h)), 2);
    ok(!exists($h{d}));
    ok(!exists($h{zzz}));
    is($d, 4);
    is($zzz, undef);

    my $c = delete local $h{c};
    is(scalar(keys(%h)), 1);
    ok(!exists($h{c}));
    is($c, 3);

    $h{yyy} = 888;
    $h{zzz} = 999;
}
is(scalar(keys(%h)), 4);
is($h{a}, 1);
is($h{b}, 2);
is($h{c}, 3);
ok($h{d}, 4);
ok(!exists($h{yyy}));
ok(!exists($h{zzz}));

%h = ('a' => { 'b' => 1 }, 'c' => 2);
{
    my $a = delete local $h{a};
    is(scalar(keys(%h)), 1);
    ok(!exists($h{a}));
    is($h{c}, 2);
    is(scalar(keys(%$a)), 1);

    my $b = delete local $a->{b};
    is(scalar(keys(%$a)), 0);
    is($b, 1);

    $a->{d} = 3;
}
is(scalar(keys(%h)), 2);
{
    my $a = $h{a};
    is(scalar(keys(%$a)), 2);
    is($a->{b}, 1);
    is($a->{d}, 3);
}
is($h{c}, 2);

%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 EXISTS { print "# EXISTS [@_]\n"; exists $_[0]->[$_[1]]; }
    sub DELETE { print "# DELETE [@_]\n"; delete $_[0]->[$_[1]]; }
    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);
}
# RT #7938: localising an array should make it temporarily untied
{
    @a = qw(a b c);
    local @a = (6,7,8);
    is("@a", "6 7 8", 'local @a assigned 6,7,8');
    {
	my $c = 0;
	local *TA::STORE = sub { $c++ };
	$a[0] = 9;
	is($c, 0, 'STORE not called after array localised');
    }
    is("@a", "9 7 8", 'local @a should now be 9 7 8');
}
is("@a", "a b c", '@a should now contain original value');


# local() should preserve the existenceness of tied array elements
@a = ('a', 'b', 'c');
{
    local($a[4]) = 'x';
    ok(!defined $a[3]);
    is($a[4], 'x');
}
is(scalar(@a), 3);
ok(!exists $a[3]);
ok(!exists $a[4]);

@a = ('a', 'b', 'c');
{
    local($a[5]) = 'z';
    $a[4] = 'y';
    ok(!defined $a[3]);
    is($a[4], 'y');
    is($a[5], 'z');
}
is(scalar(@a), 5);
ok(!defined $a[3]);
is($a[4], 'y');
ok(!exists $a[5]);

@a = ('a', 'b', 'c');
{
    local(@a[4,6]) = ('x', 'z');
    ok(!defined $a[3]);
    is($a[4], 'x');
    ok(!defined $a[5]);
    is($a[6], 'z');
}
is(scalar(@a), 3);
ok(!exists $a[3]);
ok(!exists $a[4]);
ok(!exists $a[5]);
ok(!exists $a[6]);

@a = ('a', 'b', 'c');
{
    local(@a[4,6]) = ('x', 'z');
    $a[5] = 'y';
    ok(!defined $a[3]);
    is($a[4], 'x');
    is($a[5], 'y');
    is($a[6], 'z');
}
is(scalar(@a), 6);
ok(!defined $a[3]);
ok(!defined $a[4]);
is($a[5], 'y');
ok(!exists $a[6]);

@a = ('a', 'b', 'c');
$a[4] = 'd';
{
    delete local $a[1];
    is(scalar(@a), 5);
    is($a[0], 'a');
    ok(!exists($a[1]));
    is($a[2], 'c');
    ok(!exists($a[3]));
    is($a[4], 'd');

    ok(!exists($a[888]));
    delete local $a[888];
    is(scalar(@a), 5);
    ok(!exists($a[888]));

    ok(!exists($a[999]));
    my ($d, $zzz) = delete local @a[4, 999];
    is(scalar(@a), 3);
    ok(!exists($a[4]));
    ok(!exists($a[999]));
    is($d, 'd');
    is($zzz, undef);

    my $c = delete local $a[2];
    is(scalar(@a), 1);
    ok(!exists($a[2]));
    is($c, 'c');

    $a[888] = 'yyy';
    $a[999] = 'zzz';
}
is(scalar(@a), 5);
is($a[0], 'a');
is($a[1], 'b');
is($a[2], 'c');
ok(!defined($a[3]));
is($a[4], 'd');
ok(!exists($a[5]));
ok(!exists($a[888]));
ok(!exists($a[999]));

# see if localization works on tied hashes
{
    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]} }
}

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);
}

# RT #7939: localising a hash should make it temporarily untied
{
    %h = qw(a 1 b 2 c 3);
    local %h = qw(x 6 y 7 z 8);
    is(join('', sort keys   %h), "xyz", 'local %h has new keys');
    is(join('', sort values %h), "678", 'local %h has new values');
    {
	my $c = 0;
	local *TH::STORE = sub { $c++ };
	$h{x} = 9;
	is($c, 0, 'STORE not called after hash localised');
    }
    is($h{x}, 9, '$h{x} should now be 9');
}
is(join('', sort keys   %h), "abc", 'restored %h has original keys');
is(join('', sort values %h), "123", 'restored %h has original values');


%h = (a => 1, b => 2, c => 3, d => 4);
{
    delete local $h{b};
    is(scalar(keys(%h)), 3);
    is($h{a}, 1);
    ok(!exists($h{b}));
    is($h{c}, 3);
    is($h{d}, 4);

    ok(!exists($h{yyy}));
    delete local $h{yyy};
    is(scalar(keys(%h)), 3);
    ok(!exists($h{yyy}));

    ok(!exists($h{zzz}));
    my ($d, $zzz) = delete local @h{qw/d zzz/};
    is(scalar(keys(%h)), 2);
    ok(!exists($h{d}));
    ok(!exists($h{zzz}));
    is($d, 4);
    is($zzz, undef);

    my $c = delete local $h{c};
    is(scalar(keys(%h)), 1);
    ok(!exists($h{c}));
    is($c, 3);

    $h{yyy} = 888;
    $h{zzz} = 999;
}
is(scalar(keys(%h)), 4);
is($h{a}, 1);
is($h{b}, 2);
is($h{c}, 3);
ok($h{d}, 4);
ok(!exists($h{yyy}));
ok(!exists($h{zzz}));

@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 { $_ = "Bad" },			0,
	"for local"   => sub { for("#ok?\n"){ print } },	1,
    );
    while ( ($name, $code, $ok) = splice(@tests, 0, 3) ) {
	eval { &$code };
        main::ok(($ok xor $@), "Underscore '$name'");
    }
    untie $_;
}

{
    # BUG 20001205.022 (RT #4852)
    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/);

# local($_) always strips all magic
eval { for ($1) { local $_ = 1 } };
is($@, "");

{
    my $STORE = my $FETCH = 0;
    package TieHash;
    sub TIEHASH { bless $_[1], $_[0] }
    sub FETCH   { ++$FETCH; 42 }
    sub STORE   { ++$STORE }

    package main;
    tie my %hash, "TieHash", {};

    eval { for ($hash{key}) {local $_ = 2} };
    is($STORE, 0);
    is($FETCH, 0);
}

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

# 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]');
    
}

# when localising a hash element, the key should be copied, not referenced

{
    my %h=('k1' => 111);
    my $k='k1';
    {
	local $h{$k}=222;

	is($h{'k1'},222);
	$k='k2';
    }
    ok(! exists($h{'k2'}));
    is($h{'k1'},111);
}
{
    my %h=('k1' => 111);
    our $k = 'k1';  # try dynamic too
    {
	local $h{$k}=222;
	is($h{'k1'},222);
	$k='k2';
    }
    ok(! exists($h{'k2'}));
    is($h{'k1'},111);
}

like( runperl(stderr => 1,
              prog => 'use constant foo => q(a);' .
                      'index(q(a), foo);' .
                      'local *g=${::}{foo};print q(ok);'), qr/^ok$/, "[perl #52740]");

# related to perl #112966
# Magic should not cause elements not to be deleted after scope unwinding
# when they did not exist before local()
() = \$#squinch; # $#foo in lvalue context makes array magical
{
    local $squinch[0];
    local @squinch[1..2];
    package Flibbert;
    m??; # makes stash magical
    local $Flibbert::{foo};
    local @Flibbert::{<bar baz>};
}
ok !exists $Flibbert::{foo},
  'local helem on magic hash does not leave elems on scope exit';
ok !exists $Flibbert::{bar},
  'local hslice on magic hash does not leave elems on scope exit';
ok !exists $squinch[0],
  'local aelem on magic hash does not leave elems on scope exit';
ok !exists $squinch[1],
  'local aslice on magic hash does not leave elems on scope exit';

# Keep these tests last, as they can SEGV
{
    local *@;
    pass("Localised *@");
    eval {1};
    pass("Can eval with *@ localised");

    local @{"nugguton"};
    local %{"netgonch"};
    delete $::{$_} for 'nugguton','netgonch';
}
pass ('localised arrays and hashes do not crash if glob is deleted');

# [perl #112966] Rmagic can cause delete local to crash
package Grompits {
local $SIG{__WARN__};
    delete local $ISA[0];
    delete local @ISA[1..10];
    m??; # makes stash magical
    delete local $Grompits::{foo};
    delete local @Grompits::{<foo bar>};
}
pass 'rmagic does not cause delete local to crash on nonexistent elems';
Commit	Line	Data
a687059c LW	1	#!./perl
a687059c LW	2
d441d3db RD	3	BEGIN {
d441d3db RD	4	chdir 't' if -d 't';
28e491ba	5	@INC = qw(. ../lib);
d441d3db RD	6	require './test.pl';
d441d3db RD	7	}
2c5f48c2	8	plan tests => 310;
a687059c	9
13414bd5 JM	10	my $list_assignment_supported = 1;
13414bd5 JM	11
739a0b84	12	#mg.c says list assignment not supported on VMS and SYMBIAN.
13414bd5 JM	13	$list_assignment_supported = 0 if ($^O eq 'VMS');
	14
	15
a687059c LW	16	sub foo {
	17	local($a, $b) = @_;
	18	local($c, $d);
d441d3db RD	19	$c = "c 3";
	20	$d = "d 4";
	21	{ local($a,$c) = ("a 9", "c 10"); ($x, $y) = ($a, $c); }
	22	is($a, "a 1");
	23	is($b, "b 2");
	24	$c, $d;
a687059c LW	25	}
a687059c LW	26
d441d3db RD	27	$a = "a 5";
	28	$b = "b 6";
	29	$c = "c 7";
	30	$d = "d 8";
a687059c	31
d441d3db RD	32	my @res;
	33	@res = &foo("a 1","b 2");
	34	is($res[0], "c 3");
	35	is($res[1], "d 4");
a687059c	36
d441d3db RD	37	is($a, "a 5");
	38	is($b, "b 6");
	39	is($c, "c 7");
	40	is($d, "d 8");
	41	is($x, "a 9");
	42	is($y, "c 10");
a687059c LW	43
	44	# same thing, only with arrays and associative arrays
	45
	46	sub foo2 {
	47	local($a, @b) = @_;
	48	local(@c, %d);
d441d3db RD	49	@c = "c 3";
	50	$d{''} = "d 4";
	51	{ local($a,@c) = ("a 19", "c 20"); ($x, $y) = ($a, @c); }
	52	is($a, "a 1");
	53	is("@b", "b 2");
	54	$c[0], $d{''};
a687059c LW	55	}
a687059c LW	56
d441d3db RD	57	$a = "a 5";
	58	@b = "b 6";
	59	@c = "c 7";
	60	$d{''} = "d 8";
	61
	62	@res = &foo2("a 1","b 2");
	63	is($res[0], "c 3");
	64	is($res[1], "d 4");
a687059c	65
d441d3db RD	66	is($a, "a 5");
	67	is("@b", "b 6");
	68	is($c[0], "c 7");
	69	is($d{''}, "d 8");
	70	is($x, "a 19");
	71	is($y, "c 20");
a687059c	72
706a304b SM	73
706a304b SM	74	eval 'local($$e)';
d441d3db	75	like($@, qr/Can't localize through a reference/);
706a304b	76
82d03984	77	eval '$e = []; local(@$e)';
d441d3db	78	like($@, qr/Can't localize through a reference/);
706a304b	79
82d03984	80	eval '$e = {}; local(%$e)';
d441d3db	81	like($@, qr/Can't localize through a reference/);
85aff577	82
161b7d16 SM	83	# Array and hash elements
	84
	85	@a = ('a', 'b', 'c');
	86	{
	87	local($a[1]) = 'foo';
	88	local($a[2]) = $a[2];
d441d3db RD	89	is($a[1], 'foo');
d441d3db RD	90	is($a[2], 'c');
161b7d16 SM	91	undef @a;
161b7d16 SM	92	}
d441d3db RD	93	is($a[1], 'b');
	94	is($a[2], 'c');
	95	ok(!defined $a[0]);
161b7d16 SM	96
	97	@a = ('a', 'b', 'c');
	98	{
4ad10a0b VP	99	local($a[4]) = 'x';
	100	ok(!defined $a[3]);
	101	is($a[4], 'x');
	102	}
	103	is(scalar(@a), 3);
	104	ok(!exists $a[3]);
	105	ok(!exists $a[4]);
	106
	107	@a = ('a', 'b', 'c');
	108	{
	109	local($a[5]) = 'z';
	110	$a[4] = 'y';
	111	ok(!defined $a[3]);
	112	is($a[4], 'y');
	113	is($a[5], 'z');
	114	}
	115	is(scalar(@a), 5);
	116	ok(!defined $a[3]);
	117	is($a[4], 'y');
	118	ok(!exists $a[5]);
	119
	120	@a = ('a', 'b', 'c');
	121	{
	122	local(@a[4,6]) = ('x', 'z');
	123	ok(!defined $a[3]);
	124	is($a[4], 'x');
	125	ok(!defined $a[5]);
	126	is($a[6], 'z');
	127	}
	128	is(scalar(@a), 3);
	129	ok(!exists $a[3]);
	130	ok(!exists $a[4]);
	131	ok(!exists $a[5]);
	132	ok(!exists $a[6]);
	133
	134	@a = ('a', 'b', 'c');
	135	{
	136	local(@a[4,6]) = ('x', 'z');
	137	$a[5] = 'y';
	138	ok(!defined $a[3]);
	139	is($a[4], 'x');
	140	is($a[5], 'y');
	141	is($a[6], 'z');
	142	}
	143	is(scalar(@a), 6);
	144	ok(!defined $a[3]);
	145	ok(!defined $a[4]);
	146	is($a[5], 'y');
	147	ok(!exists $a[6]);
	148
	149	@a = ('a', 'b', 'c');
	150	{
161b7d16 SM	151	local($a[1]) = "X";
	152	shift @a;
	153	}
d441d3db	154	is($a[0].$a[1], "Xb");
d60c5a05 RD	155	{
	156	my $d = "@a";
	157	local @a = @a;
	158	is("@a", $d);
	159	}
161b7d16	160
7332a6c4 VP	161	@a = ('a', 'b', 'c');
	162	$a[4] = 'd';
	163	{
	164	delete local $a[1];
	165	is(scalar(@a), 5);
	166	is($a[0], 'a');
	167	ok(!exists($a[1]));
	168	is($a[2], 'c');
	169	ok(!exists($a[3]));
	170	is($a[4], 'd');
	171
	172	ok(!exists($a[888]));
	173	delete local $a[888];
	174	is(scalar(@a), 5);
	175	ok(!exists($a[888]));
	176
	177	ok(!exists($a[999]));
	178	my ($d, $zzz) = delete local @a[4, 999];
	179	is(scalar(@a), 3);
	180	ok(!exists($a[4]));
	181	ok(!exists($a[999]));
	182	is($d, 'd');
	183	is($zzz, undef);
	184
	185	my $c = delete local $a[2];
	186	is(scalar(@a), 1);
	187	ok(!exists($a[2]));
	188	is($c, 'c');
	189
	190	$a[888] = 'yyy';
	191	$a[999] = 'zzz';
	192	}
	193	is(scalar(@a), 5);
	194	is($a[0], 'a');
	195	is($a[1], 'b');
	196	is($a[2], 'c');
	197	ok(!defined($a[3]));
	198	is($a[4], 'd');
	199	ok(!exists($a[5]));
	200	ok(!exists($a[888]));
	201	ok(!exists($a[999]));
	202
	203	%h = (a => 1, b => 2, c => 3, d => 4);
	204	{
	205	delete local $h{b};
	206	is(scalar(keys(%h)), 3);
	207	is($h{a}, 1);
	208	ok(!exists($h{b}));
	209	is($h{c}, 3);
	210	is($h{d}, 4);
	211
	212	ok(!exists($h{yyy}));
	213	delete local $h{yyy};
	214	is(scalar(keys(%h)), 3);
	215	ok(!exists($h{yyy}));
	216
	217	ok(!exists($h{zzz}));
	218	my ($d, $zzz) = delete local @h{qw/d zzz/};
	219	is(scalar(keys(%h)), 2);
	220	ok(!exists($h{d}));
	221	ok(!exists($h{zzz}));
	222	is($d, 4);
	223	is($zzz, undef);
	224
225	my $c = delete local $h{c};
226	is(scalar(keys(%h)), 1);
227	ok(!exists($h{c}));
228	is($c, 3);
229
230	$h{yyy} = 888;
231	$h{zzz} = 999;
232	}
233	is(scalar(keys(%h)), 4);
234	is($h{a}, 1);
235	is($h{b}, 2);
236	is($h{c}, 3);
237	ok($h{d}, 4);
238	ok(!exists($h{yyy}));
239	ok(!exists($h{zzz}));
240
241	%h = ('a' => { 'b' => 1 }, 'c' => 2);
242	{
243	my $a = delete local $h{a};
244	is(scalar(keys(%h)), 1);
245	ok(!exists($h{a}));
246	is($h{c}, 2);
247	is(scalar(keys(%$a)), 1);
248
249	my $b = delete local $a->{b};
250	is(scalar(keys(%$a)), 0);
251	is($b, 1);
252
253	$a->{d} = 3;
254	}
255	is(scalar(keys(%h)), 2);
256	{
257	my $a = $h{a};
258	is(scalar(keys(%$a)), 2);
259	is($a->{b}, 1);
260	is($a->{d}, 3);
261	}
262	is($h{c}, 2);
263
161b7d16 SM	264	%h = ('a' => 1, 'b' => 2, 'c' => 3);
	265	{
	266	local($h{'a'}) = 'foo';
	267	local($h{'b'}) = $h{'b'};
d441d3db RD	268	is($h{'a'}, 'foo');
d441d3db RD	269	is($h{'b'}, 2);
161b7d16 SM	270	local($h{'c'});
	271	delete $h{'c'};
	272	}
d441d3db RD	273	is($h{'a'}, 1);
d441d3db RD	274	is($h{'b'}, 2);
d60c5a05 RD	275	{
	276	my $d = join("\n", map { "$_=>$h{$_}" } sort keys %h);
	277	local %h = %h;
	278	is(join("\n", map { "$_=>$h{$_}" } sort keys %h), $d);
	279	}
d441d3db	280	is($h{'c'}, 3);
2bb40b7f GS	281
	282	# check for scope leakage
	283	$a = 'outer';
	284	if (1) { local $a = 'inner' }
d441d3db	285	is($a, 'outer');
2bb40b7f GS	286
	287	# see if localization works when scope unwinds
	288	local $m = 5;
	289	eval {
	290	for $m (6) {
	291	local $m = 7;
	292	die "bye";
	293	}
	294	};
d441d3db	295	is($m, 5);
4e4c362e GS	296
	297	# see if localization works on tied arrays
	298	{
	299	package TA;
	300	sub TIEARRAY { bless [], $_[0] }
	301	sub STORE { print "# STORE [@_]\n"; $_[0]->[$_[1]] = $_[2] }
	302	sub FETCH { my $v = $_[0]->[$_[1]]; print "# FETCH [@_=$v]\n"; $v }
4ad10a0b VP	303	sub EXISTS { print "# EXISTS [@_]\n"; exists $_[0]->[$_[1]]; }
4ad10a0b VP	304	sub DELETE { print "# DELETE [@_]\n"; delete $_[0]->[$_[1]]; }
4e4c362e GS	305	sub CLEAR { print "# CLEAR [@_]\n"; @{$_[0]} = (); }
	306	sub FETCHSIZE { scalar(@{$_[0]}) }
	307	sub SHIFT { shift (@{$_[0]}) }
	308	sub EXTEND {}
	309	}
	310
	311	tie @a, 'TA';
	312	@a = ('a', 'b', 'c');
	313	{
	314	local($a[1]) = 'foo';
be6c24e0	315	local($a[2]) = $a[2];
d441d3db RD	316	is($a[1], 'foo');
d441d3db RD	317	is($a[2], 'c');
4e4c362e GS	318	@a = ();
4e4c362e GS	319	}
d441d3db RD	320	is($a[1], 'b');
	321	is($a[2], 'c');
	322	ok(!defined $a[0]);
d60c5a05 RD	323	{
	324	my $d = "@a";
	325	local @a = @a;
	326	is("@a", $d);
	327	}
5afa72af DM	328	# RT #7938: localising an array should make it temporarily untied
	329	{
	330	@a = qw(a b c);
	331	local @a = (6,7,8);
	332	is("@a", "6 7 8", 'local @a assigned 6,7,8');
	333	{
	334	my $c = 0;
	335	local *TA::STORE = sub { $c++ };
	336	$a[0] = 9;
	337	is($c, 0, 'STORE not called after array localised');
	338	}
	339	is("@a", "9 7 8", 'local @a should now be 9 7 8');
	340	}
	341	is("@a", "a b c", '@a should now contain original value');
	342
4e4c362e	343
4ad10a0b VP	344	# local() should preserve the existenceness of tied array elements
	345	@a = ('a', 'b', 'c');
	346	{
	347	local($a[4]) = 'x';
	348	ok(!defined $a[3]);
	349	is($a[4], 'x');
	350	}
	351	is(scalar(@a), 3);
	352	ok(!exists $a[3]);
	353	ok(!exists $a[4]);
	354
	355	@a = ('a', 'b', 'c');
	356	{
	357	local($a[5]) = 'z';
	358	$a[4] = 'y';
	359	ok(!defined $a[3]);
	360	is($a[4], 'y');
	361	is($a[5], 'z');
	362	}
	363	is(scalar(@a), 5);
	364	ok(!defined $a[3]);
	365	is($a[4], 'y');
	366	ok(!exists $a[5]);
	367
	368	@a = ('a', 'b', 'c');
	369	{
	370	local(@a[4,6]) = ('x', 'z');
	371	ok(!defined $a[3]);
	372	is($a[4], 'x');
	373	ok(!defined $a[5]);
	374	is($a[6], 'z');
	375	}
	376	is(scalar(@a), 3);
	377	ok(!exists $a[3]);
	378	ok(!exists $a[4]);
	379	ok(!exists $a[5]);
	380	ok(!exists $a[6]);
	381
	382	@a = ('a', 'b', 'c');
	383	{
	384	local(@a[4,6]) = ('x', 'z');
	385	$a[5] = 'y';
	386	ok(!defined $a[3]);
	387	is($a[4], 'x');
	388	is($a[5], 'y');
	389	is($a[6], 'z');
	390	}
	391	is(scalar(@a), 6);
	392	ok(!defined $a[3]);
	393	ok(!defined $a[4]);
	394	is($a[5], 'y');
	395	ok(!exists $a[6]);
	396
7332a6c4 VP	397	@a = ('a', 'b', 'c');
	398	$a[4] = 'd';
	399	{
	400	delete local $a[1];
	401	is(scalar(@a), 5);
	402	is($a[0], 'a');
	403	ok(!exists($a[1]));
	404	is($a[2], 'c');
	405	ok(!exists($a[3]));
	406	is($a[4], 'd');
	407
	408	ok(!exists($a[888]));
	409	delete local $a[888];
	410	is(scalar(@a), 5);
	411	ok(!exists($a[888]));
	412
	413	ok(!exists($a[999]));
	414	my ($d, $zzz) = delete local @a[4, 999];
	415	is(scalar(@a), 3);
	416	ok(!exists($a[4]));
	417	ok(!exists($a[999]));
	418	is($d, 'd');
	419	is($zzz, undef);
	420
	421	my $c = delete local $a[2];
	422	is(scalar(@a), 1);
	423	ok(!exists($a[2]));
	424	is($c, 'c');
	425
	426	$a[888] = 'yyy';
	427	$a[999] = 'zzz';
	428	}
	429	is(scalar(@a), 5);
	430	is($a[0], 'a');
	431	is($a[1], 'b');
	432	is($a[2], 'c');
	433	ok(!defined($a[3]));
	434	is($a[4], 'd');
	435	ok(!exists($a[5]));
	436	ok(!exists($a[888]));
	437	ok(!exists($a[999]));
	438
4ad10a0b	439	# see if localization works on tied hashes
4e4c362e GS	440	{
	441	package TH;
	442	sub TIEHASH { bless {}, $_[0] }
	443	sub STORE { print "# STORE [@_]\n"; $_[0]->{$_[1]} = $_[2] }
	444	sub FETCH { my $v = $_[0]->{$_[1]}; print "# FETCH [@_=$v]\n"; $v }
c39e6ab0	445	sub EXISTS { print "# EXISTS [@_]\n"; exists $_[0]->{$_[1]}; }
4e4c362e GS	446	sub DELETE { print "# DELETE [@_]\n"; delete $_[0]->{$_[1]}; }
4e4c362e GS	447	sub CLEAR { print "# CLEAR [@_]\n"; %{$_[0]} = (); }
d60c5a05 RD	448	sub FIRSTKEY { print "# FIRSTKEY [@_]\n"; keys %{$_[0]}; each %{$_[0]} }
d60c5a05 RD	449	sub NEXTKEY { print "# NEXTKEY [@_]\n"; each %{$_[0]} }
4e4c362e GS	450	}
4e4c362e GS	451
4e4c362e GS	452	tie %h, 'TH';
	453	%h = ('a' => 1, 'b' => 2, 'c' => 3);
	454
	455	{
	456	local($h{'a'}) = 'foo';
be6c24e0	457	local($h{'b'}) = $h{'b'};
159ad915 DM	458	local($h{'y'});
159ad915 DM	459	local($h{'z'}) = 33;
d441d3db RD	460	is($h{'a'}, 'foo');
d441d3db RD	461	is($h{'b'}, 2);
4e4c362e GS	462	local($h{'c'});
	463	delete $h{'c'};
	464	}
d441d3db RD	465	is($h{'a'}, 1);
	466	is($h{'b'}, 2);
	467	is($h{'c'}, 3);
5afa72af	468
d441d3db RD	469	# local() should preserve the existenceness of tied hash elements
	470	ok(! exists $h{'y'});
	471	ok(! exists $h{'z'});
d60c5a05 RD	472	TODO: {
	473	todo_skip("Localize entire tied hash");
	474	my $d = join("\n", map { "$_=>$h{$_}" } sort keys %h);
	475	local %h = %h;
	476	is(join("\n", map { "$_=>$h{$_}" } sort keys %h), $d);
	477	}
4e4c362e	478
5afa72af DM	479	# RT #7939: localising a hash should make it temporarily untied
	480	{
	481	%h = qw(a 1 b 2 c 3);
	482	local %h = qw(x 6 y 7 z 8);
	483	is(join('', sort keys %h), "xyz", 'local %h has new keys');
	484	is(join('', sort values %h), "678", 'local %h has new values');
	485	{
	486	my $c = 0;
	487	local *TH::STORE = sub { $c++ };
	488	$h{x} = 9;
	489	is($c, 0, 'STORE not called after hash localised');
	490	}
	491	is($h{x}, 9, '$h{x} should now be 9');
	492	}
	493	is(join('', sort keys %h), "abc", 'restored %h has original keys');
	494	is(join('', sort values %h), "123", 'restored %h has original values');
	495
	496
7332a6c4 VP	497	%h = (a => 1, b => 2, c => 3, d => 4);
	498	{
	499	delete local $h{b};
	500	is(scalar(keys(%h)), 3);
	501	is($h{a}, 1);
	502	ok(!exists($h{b}));
	503	is($h{c}, 3);
	504	is($h{d}, 4);
	505
	506	ok(!exists($h{yyy}));
	507	delete local $h{yyy};
	508	is(scalar(keys(%h)), 3);
	509	ok(!exists($h{yyy}));
	510
	511	ok(!exists($h{zzz}));
	512	my ($d, $zzz) = delete local @h{qw/d zzz/};
	513	is(scalar(keys(%h)), 2);
	514	ok(!exists($h{d}));
	515	ok(!exists($h{zzz}));
	516	is($d, 4);
	517	is($zzz, undef);
	518
	519	my $c = delete local $h{c};
	520	is(scalar(keys(%h)), 1);
	521	ok(!exists($h{c}));
	522	is($c, 3);
	523
	524	$h{yyy} = 888;
	525	$h{zzz} = 999;
	526	}
	527	is(scalar(keys(%h)), 4);
	528	is($h{a}, 1);
	529	is($h{b}, 2);
	530	is($h{c}, 3);
	531	ok($h{d}, 4);
	532	ok(!exists($h{yyy}));
	533	ok(!exists($h{zzz}));
	534
4e4c362e GS	535	@a = ('a', 'b', 'c');
	536	{
	537	local($a[1]) = "X";
	538	shift @a;
	539	}
d441d3db	540	is($a[0].$a[1], "Xb");
4e4c362e	541
be6c24e0 GS	542	# now try the same for %SIG
	543
	544	$SIG{TERM} = 'foo';
	545	$SIG{INT} = \&foo;
	546	$SIG{__WARN__} = $SIG{INT};
	547	{
	548	local($SIG{TERM}) = $SIG{TERM};
	549	local($SIG{INT}) = $SIG{INT};
	550	local($SIG{__WARN__}) = $SIG{__WARN__};
d441d3db RD	551	is($SIG{TERM}, 'main::foo');
	552	is($SIG{INT}, \&foo);
	553	is($SIG{__WARN__}, \&foo);
be6c24e0 GS	554	local($SIG{INT});
	555	delete $SIG{__WARN__};
	556	}
d441d3db RD	557	is($SIG{TERM}, 'main::foo');
	558	is($SIG{INT}, \&foo);
	559	is($SIG{__WARN__}, \&foo);
d60c5a05 RD	560	{
	561	my $d = join("\n", map { "$_=>$SIG{$_}" } sort keys %SIG);
	562	local %SIG = %SIG;
	563	is(join("\n", map { "$_=>$SIG{$_}" } sort keys %SIG), $d);
	564	}
be6c24e0 GS	565
	566	# and for %ENV
	567
	568	$ENV{_X_} = 'a';
	569	$ENV{_Y_} = 'b';
	570	$ENV{_Z_} = 'c';
	571	{
159ad915 DM	572	local($ENV{_A_});
159ad915 DM	573	local($ENV{_B_}) = 'foo';
be6c24e0 GS	574	local($ENV{_X_}) = 'foo';
be6c24e0 GS	575	local($ENV{_Y_}) = $ENV{_Y_};
d441d3db RD	576	is($ENV{_X_}, 'foo');
d441d3db RD	577	is($ENV{_Y_}, 'b');
be6c24e0 GS	578	local($ENV{_Z_});
	579	delete $ENV{_Z_};
	580	}
d441d3db RD	581	is($ENV{_X_}, 'a');
	582	is($ENV{_Y_}, 'b');
	583	is($ENV{_Z_}, 'c');
	584	# local() should preserve the existenceness of %ENV elements
	585	ok(! exists $ENV{_A_});
	586	ok(! exists $ENV{_B_});
13414bd5 JM	587
	588	SKIP: {
	589	skip("Can't make list assignment to \%ENV on this system")
	590	unless $list_assignment_supported;
d60c5a05 RD	591	my $d = join("\n", map { "$_=>$ENV{$_}" } sort keys %ENV);
	592	local %ENV = %ENV;
	593	is(join("\n", map { "$_=>$ENV{$_}" } sort keys %ENV), $d);
	594	}
be6c24e0	595
0214ae40 GS	596	# does implicit localization in foreach skip magic?
0214ae40 GS	597
d441d3db	598	$_ = "o 0,o 1,";
0214ae40 GS	599	my $iter = 0;
0214ae40 GS	600	while (/(o.+?),/gc) {
d441d3db	601	is($1, "o $iter");
0214ae40	602	foreach (1..1) { $iter++ }
d441d3db	603	if ($iter > 2) { fail("endless loop"); last; }
0214ae40 GS	604	}
	605
	606	{
	607	package UnderScore;
	608	sub TIESCALAR { bless \my $self, shift }
	609	sub FETCH { die "read \$_ forbidden" }
	610	sub STORE { die "write \$_ forbidden" }
	611	tie $_, __PACKAGE__;
0214ae40 GS	612	my @tests = (
	613	"Nesting" => sub { print '#'; for (1..3) { print }
	614	print "\n" }, 1,
	615	"Reading" => sub { print }, 0,
	616	"Matching" => sub { $x = /badness/ }, 0,
	617	"Concat" => sub { $_ .= "a" }, 0,
	618	"Chop" => sub { chop }, 0,
	619	"Filetest" => sub { -x }, 0,
	620	"Assignment" => sub { $_ = "Bad" }, 0,
0214ae40 GS	621	"for local" => sub { for("#ok?\n"){ print } }, 1,
	622	);
	623	while ( ($name, $code, $ok) = splice(@tests, 0, 3) ) {
0214ae40	624	eval { &$code };
d441d3db	625	main::ok(($ok xor $@), "Underscore '$name'");
0214ae40 GS	626	}
	627	untie $_;
	628	}
	629
1f5346dc	630	{
9e4422ce	631	# BUG 20001205.022 (RT #4852)
1f5346dc SC	632	my %x;
	633	$x{a} = 1;
	634	{ local $x{b} = 1; }
d441d3db	635	ok(! exists $x{b});
1f5346dc	636	{ local @x{c,d,e}; }
d441d3db	637	ok(! exists $x{c});
1f5346dc	638	}
159ad915	639
33f3c7b8 RGS	640	# local() and readonly magic variables
	641
	642	eval { local $1 = 1 };
d441d3db	643	like($@, qr/Modification of a read-only value attempted/);
33f3c7b8	644
658a9f31	645	# local($_) always strips all magic
33f3c7b8	646	eval { for ($1) { local $_ = 1 } };
658a9f31	647	is($@, "");
33f3c7b8	648
658a9f31	649	{
407287f9	650	my $STORE = my $FETCH = 0;
658a9f31 JD	651	package TieHash;
658a9f31 JD	652	sub TIEHASH { bless $_[1], $_[0] }
407287f9	653	sub FETCH { ++$FETCH; 42 }
658a9f31 JD	654	sub STORE { ++$STORE }
	655
	656	package main;
	657	tie my %hash, "TieHash", {};
	658
	659	eval { for ($hash{key}) {local $_ = 2} };
	660	is($STORE, 0);
407287f9	661	is($FETCH, 0);
658a9f31	662	}
ac117f44 RGS	663
	664	# The s/// adds 'g' magic to $_, but it should remain non-readonly
	665	eval { for("a") { for $x (1,2) { local $_="b"; s/(.*)/+$1/ } } };
d441d3db	666	is($@, "");
4cb09e0a	667
985d6f61 HS	668	# sub localisation
	669	{
	670	package Other;
	671
	672	sub f1 { "f1" }
	673	sub f2 { "f2" }
	674
	675	no warnings "redefine";
	676	{
	677	local *f1 = sub { "g1" };
	678	::ok(f1() eq "g1", "localised sub via glob");
	679	}
	680	::ok(f1() eq "f1", "localised sub restored");
	681	{
	682	local $Other::{"f1"} = sub { "h1" };
	683	::ok(f1() eq "h1", "localised sub via stash");
	684	}
	685	::ok(f1() eq "f1", "localised sub restored");
	686	{
	687	local @Other::{qw/ f1 f2 /} = (sub { "j1" }, sub { "j2" });
985d6f61 HS	688	::ok(f1() eq "j1", "localised sub via stash slice");
985d6f61 HS	689	::ok(f2() eq "j2", "localised sub via stash slice");
985d6f61 HS	690	}
	691	::ok(f1() eq "f1", "localised sub restored");
	692	::ok(f2() eq "f2", "localised sub restored");
	693	}
7d654f43 NC	694
	695	# Localising unicode keys (bug #38815)
	696	{
	697	my %h;
	698	$h{"\243"} = "pound";
	699	$h{"\302\240"} = "octects";
	700	is(scalar keys %h, 2);
	701	{
	702	my $unicode = chr 256;
	703	my $ambigous = "\240" . $unicode;
	704	chop $ambigous;
	705	local $h{$unicode} = 256;
	706	local $h{$ambigous} = 160;
	707
	708	is(scalar keys %h, 4);
	709	is($h{"\243"}, "pound");
	710	is($h{$unicode}, 256);
	711	is($h{$ambigous}, 160);
	712	is($h{"\302\240"}, "octects");
	713	}
	714	is(scalar keys %h, 2);
	715	is($h{"\243"}, "pound");
	716	is($h{"\302\240"}, "octects");
	717	}
919acde0 NC	718
	719	# And with slices
	720	{
	721	my %h;
	722	$h{"\243"} = "pound";
	723	$h{"\302\240"} = "octects";
	724	is(scalar keys %h, 2);
	725	{
	726	my $unicode = chr 256;
	727	my $ambigous = "\240" . $unicode;
	728	chop $ambigous;
	729	local @h{$unicode, $ambigous} = (256, 160);
	730
	731	is(scalar keys %h, 4);
	732	is($h{"\243"}, "pound");
	733	is($h{$unicode}, 256);
	734	is($h{$ambigous}, 160);
	735	is($h{"\302\240"}, "octects");
	736	}
	737	is(scalar keys %h, 2);
	738	is($h{"\243"}, "pound");
	739	is($h{"\302\240"}, "octects");
	740	}
658aef79 DM	741
	742	# [perl #39012] localizing @_ element then shifting frees element too # soon
	743
	744	{
	745	my $x;
	746	my $y = bless [], 'X39012';
	747	sub X39012::DESTROY { $x++ }
	748	sub { local $_[0]; shift }->($y);
	749	ok(!$x, '[perl #39012]');
	750
	751	}
	752
b2096149 BL	753	# when localising a hash element, the key should be copied, not referenced
	754
	755	{
	756	my %h=('k1' => 111);
	757	my $k='k1';
	758	{
	759	local $h{$k}=222;
	760
	761	is($h{'k1'},222);
	762	$k='k2';
	763	}
	764	ok(! exists($h{'k2'}));
	765	is($h{'k1'},111);
	766	}
46c458a0 HS	767	{
	768	my %h=('k1' => 111);
	769	our $k = 'k1'; # try dynamic too
	770	{
	771	local $h{$k}=222;
	772	is($h{'k1'},222);
	773	$k='k2';
	774	}
	775	ok(! exists($h{'k2'}));
	776	is($h{'k1'},111);
	777	}
72651472	778
07a28ea7 B	779	like( runperl(stderr => 1,
	780	prog => 'use constant foo => q(a);' .
	781	'index(q(a), foo);' .
aaa63dae	782	'local *g=${::}{foo};print q(ok);'), qr/^ok$/, "[perl #52740]");
07a28ea7	783
2c5f48c2 FC	784	# related to perl #112966
	785	# Magic should not cause elements not to be deleted after scope unwinding
	786	# when they did not exist before local()
	787	() = \$#squinch; # $#foo in lvalue context makes array magical
	788	{
	789	local $squinch[0];
	790	local @squinch[1..2];
	791	package Flibbert;
	792	m??; # makes stash magical
	793	local $Flibbert::{foo};
	794	local @Flibbert::{<bar baz>};
	795	}
	796	ok !exists $Flibbert::{foo},
	797	'local helem on magic hash does not leave elems on scope exit';
	798	ok !exists $Flibbert::{bar},
	799	'local hslice on magic hash does not leave elems on scope exit';
	800	ok !exists $squinch[0],
	801	'local aelem on magic hash does not leave elems on scope exit';
	802	ok !exists $squinch[1],
	803	'local aslice on magic hash does not leave elems on scope exit';
	804
01433346	805	# Keep these tests last, as they can SEGV
72651472 NC	806	{
	807	local *@;
	808	pass("Localised *@");
	809	eval {1};
	810	pass("Can eval with *@ localised");
72651472	811
01433346 FC	812	local @{"nugguton"};
	813	local %{"netgonch"};
	814	delete $::{$_} for 'nugguton','netgonch';
	815	}
	816	pass ('localised arrays and hashes do not crash if glob is deleted');
2c5f48c2 FC	817
	818	# [perl #112966] Rmagic can cause delete local to crash
	819	package Grompits {
	820	local $SIG{__WARN__};
	821	delete local $ISA[0];
	822	delete local @ISA[1..10];
	823	m??; # makes stash magical
	824	delete local $Grompits::{foo};
	825	delete local @Grompits::{<foo bar>};
	826	}
	827	pass 'rmagic does not cause delete local to crash on nonexistent elems';