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

#!./perl -w

BEGIN {
    chdir 't' if -d 't';
    require './test.pl';
    set_up_inc('../lib');
}

plan(tests => 58);

sub empty_sub {}

is(empty_sub,undef,"Is empty");
is(empty_sub(1,2,3),undef,"Is still empty");
@test = empty_sub();
is(scalar(@test), 0, 'Didnt return anything');
@test = empty_sub(1,2,3);
is(scalar(@test), 0, 'Didnt return anything');

# RT #63790:  calling PL_sv_yes as a sub is special-cased to silently
# return (so Foo->import() silently fails if import() doesn't exist),
# But make sure it correctly pops the stack and mark stack before returning.

{
    my @a;
    push @a, 4, 5, main->import(6,7);
    ok(eq_array(\@a, [4,5]), "import with args");

    @a = ();
    push @a, 14, 15, main->import;
    ok(eq_array(\@a, [14,15]), "import without args");

    my $x = 1;

    @a = ();
    push @a, 24, 25, &{$x == $x}(26,27);
    ok(eq_array(\@a, [24,25]), "yes with args");

    @a = ();
    push @a, 34, 35, &{$x == $x};
    ok(eq_array(\@a, [34,35]), "yes without args");
}

# [perl #81944] return should always copy
{
    $foo{bar} = 7;
    for my $x ($foo{bar}) {
	# Pity test.pl doesnt have isn't.
	isnt \sub { delete $foo{bar} }->(), \$x,
	   'result of delete(helem) is copied when returned';
    }
    $foo{bar} = 7;
    for my $x ($foo{bar}) {
	isnt \sub { return delete $foo{bar} }->(), \$x,
	   'result of delete(helem) is copied when explicitly returned';
    }
    my $x;
    isnt \sub { delete $_[0] }->($x), \$x,
      'result of delete(aelem) is copied when returned';
    isnt \sub { return delete $_[0] }->($x), \$x,
      'result of delete(aelem) is copied when explicitly returned';
    isnt \sub { ()=\@_; shift }->($x), \$x,
      'result of shift is copied when returned';
    isnt \sub { ()=\@_; return shift }->($x), \$x,
      'result of shift is copied when explicitly returned';
}

fresh_perl_is
  <<'end', "main::foo\n", {}, 'sub redefinition sets CvGV';
*foo = \&baz;
*bar = *foo;
eval 'sub bar { print +(caller 0)[3], "\n" }';
bar();
end

fresh_perl_is
  <<'end', "main::foo\nok\n", {}, 'no double free redefining anon stub';
my $sub = sub { 4 };
*foo = $sub;
*bar = *foo;
undef &$sub;
eval 'sub bar { print +(caller 0)[3], "\n" }';
&$sub;
undef *foo;
undef *bar;
print "ok\n";
end

# The outer call sets the scalar returned by ${\""}.${\""} to the current
# package name.
# The inner call sets it to "road".
# Each call records the value twice, the outer call surrounding the inner
# call.  In 5.10-5.18 under ithreads, what gets pushed is
# qw(main road road road) because the inner call is clobbering the same
# scalar.  If __PACKAGE__ is changed to "main", it works, the last element
# becoming "main".
my @scratch;
sub a {
  for (${\""}.${\""}) {
    $_ = $_[0];
    push @scratch, $_;
    a("road",1) unless $_[1];
    push @scratch, $_;
  }
}
a(__PACKAGE__);
require Config;
is "@scratch", "main road road main",
   'recursive calls do not share shared-hash-key TARGs';

# Another test for the same bug, that does not rely on foreach.  It depends
# on ref returning a shared hash key TARG.
undef @scratch;
sub b {
    my ($pack, $depth) = @_;
    my $o = bless[], $pack;
    $pack++;
    push @scratch, (ref $o, $depth||b($pack,$depth+1))[0];
}
b('n',0);
is "@scratch", "o n", 
   'recursive calls do not share shared-hash-key TARGs (2)';

# [perl #78194] @_ aliasing op return values
sub { is \$_[0], \$_[0],
        '[perl #78194] \$_[0] == \$_[0] when @_ aliases "$x"' }
 ->("${\''}");

# The return statement should make no difference in this case:
sub not_constant () {        42 }
sub not_constantr() { return 42 }
use feature 'lexical_subs'; no warnings 'experimental::lexical_subs';
my sub not_constantm () {        42 }
my sub not_constantmr() { return 42 }
eval { ${\not_constant}++ };
is $@, "", 'sub (){42} returns a mutable value';
eval { ${\not_constantr}++ };
is $@, "", 'sub (){ return 42 } returns a mutable value';
eval { ${\not_constantm}++ };
is $@, "", 'my sub (){42} returns a mutable value';
eval { ${\not_constantmr}++ };
is $@, "", 'my sub (){ return 42 } returns a mutable value';
is eval {
    sub Crunchy () { 1 }
    sub Munchy { $_[0] = 2 }
    eval "Crunchy"; # test that freeing this op does not turn off PADTMP
    Munchy(Crunchy);
} || $@, 2, 'freeing ops does not make sub(){42} immutable';

# &xsub when @_ has nonexistent elements
{
    no warnings "uninitialized";
    local @_ = ();
    $#_++;
    &utf8::encode;
    is @_, 1, 'num of elems in @_ after &xsub with nonexistent $_[0]';
    is $_[0], "", 'content of nonexistent $_[0] is modified by &xsub';
}

# &xsub when @_ itself does not exist
undef *_;
eval { &utf8::encode };
# The main thing we are testing is that it did not crash.  But make sure 
# *_{ARRAY} was untouched, too.
is *_{ARRAY}, undef, 'goto &xsub when @_ does not exist';

# We do not want re.pm loaded at this point.  Move this test up or find
# another XSUB if this fails.
ok !exists $INC{"re.pm"}, 're.pm not loaded yet';
{
    sub re::regmust{}
    bless \&re::regmust;
    DESTROY {
        no warnings 'redefine', 'prototype';
        my $str1 = "$_[0]";
        *re::regmust = sub{}; # GvSV had no refcount, so this freed it
        my $str2 = "$_[0]";   # used to be UNKNOWN(0x7fdda29310e0)
        @str = ($str1, $str2);
    }
    local $^W; # Suppress redef warnings in XSLoader
    require re;
    is $str[1], $str[0],
      'XSUB clobbering sub whose DESTROY assigns to the glob';
}
{
    no warnings 'redefine';
    sub foo {}
    bless \&foo, 'newATTRSUBbug';
    sub newATTRSUBbug::DESTROY {
        my $str1 = "$_[0]";
        *foo = sub{}; # GvSV had no refcount, so this freed it
        my $str2 = "$_[0]";   # used to be UNKNOWN(0x7fdda29310e0)
        @str = ($str1, $str2);
    }
    splice @str;
    eval "sub foo{}";
    is $str[1], $str[0],
      'Pure-Perl sub clobbering sub whose DESTROY assigns to the glob';
}

# [perl #122107] previously this would return
#  Subroutine BEGIN redefined at (eval 2) line 2.
fresh_perl_is(<<'EOS', "", { stderr => 1 },
use strict; use warnings; eval q/use File::{Spec}/; eval q/use File::Spec/;
EOS
	       "check special blocks are cleared on error");

use constant { constant1 => 1, constant2 => 2 };
{
    my $w;
    local $SIG{__WARN__} = sub { $w++ };
    eval 'sub constant1; sub constant2($)';
    is eval '&constant1', '1',
      'stub re-declaration of constant with no prototype';
    is eval '&constant2', '2',
      'stub re-declaration of constant with wrong prototype';
    is $w, 2, 'two warnings from the above';
}

package _122845 {
    our $depth = 0;
    my $parent; # just to make the sub a closure

    sub {
	local $depth = $depth + 1;
	our $ok++, return if $depth == 2;

	()= $parent;  # just to make the sub a closure
	our $whatever; # this causes the crash

	CORE::__SUB__->();
    }->();
};
is $_122845::ok, 1,
  '[perl #122845] no crash in closure recursion with our-vars';

() = *predeclared; # vivify the glob at compile time
sub predeclared; # now we have a CV stub with no body (incorporeal? :-)
sub predeclared {
    CORE::state $x = 42;
    sub inside_predeclared {
	is eval '$x', 42, 'eval q/$var/ in named sub in predeclared sub';
    }
}
predeclared(); # set $x to 42
$main::x = $main::x = "You should not see this.";
inside_predeclared(); # run test

# RT #126845: this used to fail an assertion in Perl_newATTRSUB_x()
eval 'sub rt126845_1 (); sub rt126845_1 () :lvalue';
pass("RT #126845: stub with prototype, then with attribute");

eval 'sub rt126845_2 (); sub rt126845_2 () :lvalue {}';
pass("RT #126845: stub with prototype, then definition with attribute");

# RT #124156 death during unwinding causes crash
# the tie allows us to trigger another die while cleaning up the stack
# from an earlier die.

{
    package RT124156;

    sub TIEHASH { bless({}, $_[0]) }
    sub EXISTS { 0 }
    sub FETCH { undef }
    sub STORE { }
    sub DELETE { die "outer\n" }

    my @value;
    eval {
        @value = sub {
            @value = sub {
                my %a;
                tie %a, "RT124156";
                local $a{foo} = "bar";
                die "inner";
                ("dd2a", "dd2b");
            }->();
            ("cc3a", "cc3b");
        }->();
    };
    ::is($@, "outer\n", "RT124156 plain");

    my $destroyed = 0;
    sub DESTROY { $destroyed = 1 }

    sub f {
        my $x;
        my $f = sub {
            $x = 1; # force closure
            my %a;
            tie %a, "RT124156";
            local $a{foo} = "bar";
            die "inner";
        };
        bless $f, 'RT124156';
        $f->();
    }

    eval { f(); };
    # as opposed to $@ eq "Can't undef active subroutine"
    ::is($@, "outer\n", "RT124156 depth");
    ::is($destroyed, 1, "RT124156 freed cv");
}

# trapping dying while popping a scope needs to have the right pad at all
# times. Localising a tied array then dying in STORE raises an exception
# while leaving g(). Note that using an object and destructor wouldn't be
# sufficient since DESTROY is called with call_sv(...,G_EVAL).
# We make sure that the first item in every sub's pad is a lexical with
# different values per sub.

{
    package tie_exception;
    sub TIEARRAY { my $x = 4; bless [0] }
    sub FETCH    { my $x = 5; 1 }
    sub STORE    { my $x = 6; die if $_[0][0]; $_[0][0] = 1 }

    my $y;
    sub f { my $x = 7; eval { g() }; $y = $x }
    sub g {
        my $x = 8;
        my @a;
        tie @a, "tie_exception";
        local $a[0];
    }

    f();
    ::is($y, 7, "tie_exception");
}


# check that return pops extraneous stuff from the stack

sub check_ret {
    # the extra scopes push contexts and extra SVs on the stack
    {
        my @a = map $_ + 20, @_;
        for ('x') {
            return if defined $_[0] && $_[0] < 0;
        }
        for ('y') {
            check_ret(1, do { (2,3,4, return @a ? @a[0..$#a] : ()) }, 4.5);
        }
    }
}

is(scalar check_ret(),          undef, "check_ret() scalar");
is(scalar check_ret(5),         25,    "check_ret(5) scalar");
is(scalar check_ret(5,6),       26,    "check_ret(5,6) scalar");
is(scalar check_ret(5,6,7),     27,    "check_ret(5,6,7) scalar");
is(scalar check_ret(5,6,7,8),   28,    "check_ret(5,6,7,8) scalar");
is(scalar check_ret(5,6,7,8,9), 29,    "check_ret(5,6,7,8,9) scalar");

is(scalar check_ret(-1),        undef, "check_ret(-1) scalar");
is(scalar check_ret(-1,5),      undef, "check_ret(-1,5) scalar");

is(join('-', 10, check_ret()),          "10",                "check_ret() list");
is(join('-', 10, check_ret(5)),         "10-25",             "check_ret(5) list");
is(join('-', 10, check_ret(5,6)),       "10-25-26",          "check_ret(5,6) list");
is(join('-', 10, check_ret(5,6,7)),     "10-25-26-27",       "check_ret(5,6,7) list");
is(join('-', 10, check_ret(5,6,7,8)),   "10-25-26-27-28",    "check_ret(5,6,7,8) list");
is(join('-', 10, check_ret(5,6,7,8,9)), "10-25-26-27-28-29", "check_ret(5,6,7,8,9) list");

is(join('-', 10, check_ret(-1)),        "10",  "check_ret(-1) list");
is(join('-', 10, check_ret(-1,5)),      "10",  "check_ret(-1,5) list");
Commit	Line	Data
f7218ed4	1	#!./perl -w
2d981f27 AB	2
	3	BEGIN {
	4	chdir 't' if -d 't';
f7218ed4	5	require './test.pl';
43ece5b1	6	set_up_inc('../lib');
2d981f27 AB	7	}
2d981f27 AB	8
3b21fb5d	9	plan(tests => 58);
2d981f27 AB	10
	11	sub empty_sub {}
	12
	13	is(empty_sub,undef,"Is empty");
	14	is(empty_sub(1,2,3),undef,"Is still empty");
	15	@test = empty_sub();
	16	is(scalar(@test), 0, 'Didnt return anything');
	17	@test = empty_sub(1,2,3);
	18	is(scalar(@test), 0, 'Didnt return anything');
	19
4d198de3 DM	20	# RT #63790: calling PL_sv_yes as a sub is special-cased to silently
	21	# return (so Foo->import() silently fails if import() doesn't exist),
	22	# But make sure it correctly pops the stack and mark stack before returning.
	23
	24	{
	25	my @a;
	26	push @a, 4, 5, main->import(6,7);
	27	ok(eq_array(\@a, [4,5]), "import with args");
	28
	29	@a = ();
	30	push @a, 14, 15, main->import;
	31	ok(eq_array(\@a, [14,15]), "import without args");
	32
	33	my $x = 1;
	34
	35	@a = ();
	36	push @a, 24, 25, &{$x == $x}(26,27);
	37	ok(eq_array(\@a, [24,25]), "yes with args");
	38
	39	@a = ();
	40	push @a, 34, 35, &{$x == $x};
	41	ok(eq_array(\@a, [34,35]), "yes without args");
	42	}
3ed94dc0 FC	43
	44	# [perl #81944] return should always copy
	45	{
	46	$foo{bar} = 7;
	47	for my $x ($foo{bar}) {
	48	# Pity test.pl doesnt have isn't.
	49	isnt \sub { delete $foo{bar} }->(), \$x,
	50	'result of delete(helem) is copied when returned';
	51	}
	52	$foo{bar} = 7;
	53	for my $x ($foo{bar}) {
	54	isnt \sub { return delete $foo{bar} }->(), \$x,
	55	'result of delete(helem) is copied when explicitly returned';
	56	}
	57	my $x;
	58	isnt \sub { delete $_[0] }->($x), \$x,
	59	'result of delete(aelem) is copied when returned';
	60	isnt \sub { return delete $_[0] }->($x), \$x,
	61	'result of delete(aelem) is copied when explicitly returned';
	62	isnt \sub { ()=\@_; shift }->($x), \$x,
	63	'result of shift is copied when returned';
	64	isnt \sub { ()=\@_; return shift }->($x), \$x,
	65	'result of shift is copied when explicitly returned';
	66	}
f6894bc8 FC	67
	68	fresh_perl_is
	69	<<'end', "main::foo\n", {}, 'sub redefinition sets CvGV';
	70	*foo = \&baz;
	71	bar = foo;
	72	eval 'sub bar { print +(caller 0)[3], "\n" }';
	73	bar();
	74	end
e52de15a FC	75
	76	fresh_perl_is
	77	<<'end', "main::foo\nok\n", {}, 'no double free redefining anon stub';
	78	my $sub = sub { 4 };
	79	*foo = $sub;
	80	bar = foo;
	81	undef &$sub;
	82	eval 'sub bar { print +(caller 0)[3], "\n" }';
	83	&$sub;
	84	undef *foo;
	85	undef *bar;
	86	print "ok\n";
	87	end
7f6ba6d2 FC	88
	89	# The outer call sets the scalar returned by ${\""}.${\""} to the current
	90	# package name.
	91	# The inner call sets it to "road".
	92	# Each call records the value twice, the outer call surrounding the inner
	93	# call. In 5.10-5.18 under ithreads, what gets pushed is
	94	# qw(main road road road) because the inner call is clobbering the same
	95	# scalar. If __PACKAGE__ is changed to "main", it works, the last element
	96	# becoming "main".
	97	my @scratch;
	98	sub a {
	99	for (${\""}.${\""}) {
	100	$_ = $_[0];
	101	push @scratch, $_;
	102	a("road",1) unless $_[1];
	103	push @scratch, $_;
	104	}
	105	}
	106	a(__PACKAGE__);
	107	require Config;
7f6ba6d2 FC	108	is "@scratch", "main road road main",
7f6ba6d2 FC	109	'recursive calls do not share shared-hash-key TARGs';
8e079c2a FC	110
	111	# Another test for the same bug, that does not rely on foreach. It depends
	112	# on ref returning a shared hash key TARG.
	113	undef @scratch;
	114	sub b {
	115	my ($pack, $depth) = @_;
	116	my $o = bless[], $pack;
	117	$pack++;
	118	push @scratch, (ref $o, $depth\|\|b($pack,$depth+1))[0];
	119	}
	120	b('n',0);
8e079c2a FC	121	is "@scratch", "o n",
8e079c2a FC	122	'recursive calls do not share shared-hash-key TARGs (2)';
2d885586	123
2d885586 FC	124	# [perl #78194] @_ aliasing op return values
	125	sub { is \$_[0], \$_[0],
	126	'[perl #78194] \$_[0] == \$_[0] when @_ aliases "$x"' }
	127	->("${\''}");
b784b94c FC	128
	129	# The return statement should make no difference in this case:
	130	sub not_constant () { 42 }
	131	sub not_constantr() { return 42 }
d2440203 FC	132	use feature 'lexical_subs'; no warnings 'experimental::lexical_subs';
	133	my sub not_constantm () { 42 }
	134	my sub not_constantmr() { return 42 }
b784b94c FC	135	eval { ${\not_constant}++ };
b784b94c FC	136	is $@, "", 'sub (){42} returns a mutable value';
b784b94c FC	137	eval { ${\not_constantr}++ };
b784b94c FC	138	is $@, "", 'sub (){ return 42 } returns a mutable value';
d2440203 FC	139	eval { ${\not_constantm}++ };
	140	is $@, "", 'my sub (){42} returns a mutable value';
	141	eval { ${\not_constantmr}++ };
	142	is $@, "", 'my sub (){ return 42 } returns a mutable value';
0ad6fa35 FC	143	is eval {
	144	sub Crunchy () { 1 }
	145	sub Munchy { $_[0] = 2 }
	146	eval "Crunchy"; # test that freeing this op does not turn off PADTMP
	147	Munchy(Crunchy);
	148	} \|\| $@, 2, 'freeing ops does not make sub(){42} immutable';
137da2b0	149
dd2a7f90 FC	150	# &xsub when @_ has nonexistent elements
	151	{
	152	no warnings "uninitialized";
	153	local @_ = ();
	154	$#_++;
	155	&utf8::encode;
	156	is @_, 1, 'num of elems in @_ after &xsub with nonexistent $_[0]';
	157	is $_[0], "", 'content of nonexistent $_[0] is modified by &xsub';
	158	}
8c9d3376 FC	159
	160	# &xsub when @_ itself does not exist
	161	undef *_;
	162	eval { &utf8::encode };
	163	# The main thing we are testing is that it did not crash. But make sure
	164	# *_{ARRAY} was untouched, too.
	165	is *_{ARRAY}, undef, 'goto &xsub when @_ does not exist';
7004ee49 FC	166
	167	# We do not want re.pm loaded at this point. Move this test up or find
	168	# another XSUB if this fails.
	169	ok !exists $INC{"re.pm"}, 're.pm not loaded yet';
	170	{
7004ee49 FC	171	sub re::regmust{}
	172	bless \&re::regmust;
	173	DESTROY {
a28a9f6b	174	no warnings 'redefine', 'prototype';
7004ee49 FC	175	my $str1 = "$_[0]";
	176	*re::regmust = sub{}; # GvSV had no refcount, so this freed it
	177	my $str2 = "$_[0]"; # used to be UNKNOWN(0x7fdda29310e0)
	178	@str = ($str1, $str2);
	179	}
a28a9f6b	180	local $^W; # Suppress redef warnings in XSLoader
7004ee49 FC	181	require re;
	182	is $str[1], $str[0],
	183	'XSUB clobbering sub whose DESTROY assigns to the glob';
	184	}
a6181857 FC	185	{
	186	no warnings 'redefine';
	187	sub foo {}
	188	bless \&foo, 'newATTRSUBbug';
	189	sub newATTRSUBbug::DESTROY {
	190	my $str1 = "$_[0]";
	191	*foo = sub{}; # GvSV had no refcount, so this freed it
	192	my $str2 = "$_[0]"; # used to be UNKNOWN(0x7fdda29310e0)
	193	@str = ($str1, $str2);
	194	}
	195	splice @str;
	196	eval "sub foo{}";
	197	is $str[1], $str[0],
	198	'Pure-Perl sub clobbering sub whose DESTROY assigns to the glob';
	199	}
2806bfd8	200
2806bfd8 TC	201	# [perl #122107] previously this would return
	202	# Subroutine BEGIN redefined at (eval 2) line 2.
	203	fresh_perl_is(<<'EOS', "", { stderr => 1 },
	204	use strict; use warnings; eval q/use File::{Spec}/; eval q/use File::Spec/;
	205	EOS
	206	"check special blocks are cleared on error");
59e6df9f FC	207
	208	use constant { constant1 => 1, constant2 => 2 };
	209	{
	210	my $w;
	211	local $SIG{__WARN__} = sub { $w++ };
	212	eval 'sub constant1; sub constant2($)';
	213	is eval '&constant1', '1',
	214	'stub re-declaration of constant with no prototype';
	215	is eval '&constant2', '2',
	216	'stub re-declaration of constant with wrong prototype';
	217	is $w, 2, 'two warnings from the above';
	218	}
7805ed55 FC	219
	220	package _122845 {
	221	our $depth = 0;
	222	my $parent; # just to make the sub a closure
	223
	224	sub {
	225	local $depth = $depth + 1;
	226	our $ok++, return if $depth == 2;
	227
	228	()= $parent; # just to make the sub a closure
	229	our $whatever; # this causes the crash
	230
	231	CORE::__SUB__->();
	232	}->();
	233	};
	234	is $_122845::ok, 1,
	235	'[perl #122845] no crash in closure recursion with our-vars';
a70f21d0 FC	236
	237	() = *predeclared; # vivify the glob at compile time
	238	sub predeclared; # now we have a CV stub with no body (incorporeal? :-)
	239	sub predeclared {
	240	CORE::state $x = 42;
	241	sub inside_predeclared {
	242	is eval '$x', 42, 'eval q/$var/ in named sub in predeclared sub';
	243	}
	244	}
	245	predeclared(); # set $x to 42
	246	$main::x = $main::x = "You should not see this.";
	247	inside_predeclared(); # run test
1956db7e	248
a934a4a7 AC	249	# RT #126845: this used to fail an assertion in Perl_newATTRSUB_x()
	250	eval 'sub rt126845_1 (); sub rt126845_1 () :lvalue';
	251	pass("RT #126845: stub with prototype, then with attribute");
	252
	253	eval 'sub rt126845_2 (); sub rt126845_2 () :lvalue {}';
	254	pass("RT #126845: stub with prototype, then definition with attribute");
	255
1956db7e DM	256	# RT #124156 death during unwinding causes crash
	257	# the tie allows us to trigger another die while cleaning up the stack
	258	# from an earlier die.
	259
	260	{
	261	package RT124156;
	262
	263	sub TIEHASH { bless({}, $_[0]) }
	264	sub EXISTS { 0 }
	265	sub FETCH { undef }
	266	sub STORE { }
	267	sub DELETE { die "outer\n" }
	268
	269	my @value;
	270	eval {
	271	@value = sub {
	272	@value = sub {
	273	my %a;
	274	tie %a, "RT124156";
	275	local $a{foo} = "bar";
	276	die "inner";
	277	("dd2a", "dd2b");
	278	}->();
	279	("cc3a", "cc3b");
	280	}->();
	281	};
	282	::is($@, "outer\n", "RT124156 plain");
	283
	284	my $destroyed = 0;
	285	sub DESTROY { $destroyed = 1 }
	286
	287	sub f {
	288	my $x;
	289	my $f = sub {
	290	$x = 1; # force closure
	291	my %a;
	292	tie %a, "RT124156";
	293	local $a{foo} = "bar";
	294	die "inner";
	295	};
	296	bless $f, 'RT124156';
	297	$f->();
	298	}
	299
	300	eval { f(); };
	301	# as opposed to $@ eq "Can't undef active subroutine"
	302	::is($@, "outer\n", "RT124156 depth");
	303	::is($destroyed, 1, "RT124156 freed cv");
	304	}
6228a1e1	305
3b21fb5d DM	306	# trapping dying while popping a scope needs to have the right pad at all
	307	# times. Localising a tied array then dying in STORE raises an exception
	308	# while leaving g(). Note that using an object and destructor wouldn't be
	309	# sufficient since DESTROY is called with call_sv(...,G_EVAL).
	310	# We make sure that the first item in every sub's pad is a lexical with
	311	# different values per sub.
	312
	313	{
	314	package tie_exception;
	315	sub TIEARRAY { my $x = 4; bless [0] }
	316	sub FETCH { my $x = 5; 1 }
	317	sub STORE { my $x = 6; die if $_[0][0]; $_[0][0] = 1 }
	318
	319	my $y;
	320	sub f { my $x = 7; eval { g() }; $y = $x }
	321	sub g {
	322	my $x = 8;
	323	my @a;
	324	tie @a, "tie_exception";
	325	local $a[0];
	326	}
	327
	328	f();
3b21fb5d DM	329	::is($y, 7, "tie_exception");
	330	}
	331
6228a1e1 DM	332
	333	# check that return pops extraneous stuff from the stack
	334
	335	sub check_ret {
	336	# the extra scopes push contexts and extra SVs on the stack
	337	{
	338	my @a = map $_ + 20, @_;
	339	for ('x') {
	340	return if defined $_[0] && $_[0] < 0;
	341	}
	342	for ('y') {
	343	check_ret(1, do { (2,3,4, return @a ? @a[0..$#a] : ()) }, 4.5);
	344	}
	345	}
	346	}
	347
	348	is(scalar check_ret(), undef, "check_ret() scalar");
	349	is(scalar check_ret(5), 25, "check_ret(5) scalar");
	350	is(scalar check_ret(5,6), 26, "check_ret(5,6) scalar");
	351	is(scalar check_ret(5,6,7), 27, "check_ret(5,6,7) scalar");
	352	is(scalar check_ret(5,6,7,8), 28, "check_ret(5,6,7,8) scalar");
	353	is(scalar check_ret(5,6,7,8,9), 29, "check_ret(5,6,7,8,9) scalar");
	354
	355	is(scalar check_ret(-1), undef, "check_ret(-1) scalar");
	356	is(scalar check_ret(-1,5), undef, "check_ret(-1,5) scalar");
	357
	358	is(join('-', 10, check_ret()), "10", "check_ret() list");
	359	is(join('-', 10, check_ret(5)), "10-25", "check_ret(5) list");
	360	is(join('-', 10, check_ret(5,6)), "10-25-26", "check_ret(5,6) list");
	361	is(join('-', 10, check_ret(5,6,7)), "10-25-26-27", "check_ret(5,6,7) list");
	362	is(join('-', 10, check_ret(5,6,7,8)), "10-25-26-27-28", "check_ret(5,6,7,8) list");
	363	is(join('-', 10, check_ret(5,6,7,8,9)), "10-25-26-27-28-29", "check_ret(5,6,7,8,9) list");
	364
	365	is(join('-', 10, check_ret(-1)), "10", "check_ret(-1) list");
	366	is(join('-', 10, check_ret(-1,5)), "10", "check_ret(-1,5) list");