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BEGIN {
chdir 't' if -d 't';
@INC = '../lib';
require './test.pl';
}
plan tests=>205;
sub a : lvalue { my $a = 34; ${\(bless \$a)} } # Return a temporary
sub b : lvalue { ${\shift} }
my $out = a(b()); # Check that temporaries are allowed.
is(ref $out, 'main'); # Not reached if error.
my @out = grep /main/, a(b()); # Check that temporaries are allowed.
cmp_ok(scalar @out, '==', 1); # Not reached if error.
my $in;
# Check that we can return localized values from subroutines:
sub in : lvalue { $in = shift; }
sub neg : lvalue { #(num_str) return num_str
local $_ = shift;
s/^\+/-/;
$_;
}
in(neg("+2"));
is($in, '-2');
sub get_lex : lvalue { $in }
sub get_st : lvalue { $blah }
sub id : lvalue { ${\shift} }
sub id1 : lvalue { $_[0] }
sub inc : lvalue { ${\++$_[0]} }
$in = 5;
$blah = 3;
get_st = 7;
cmp_ok($blah, '==', 7);
get_lex = 7;
cmp_ok($in, '==', 7);
++get_st;
cmp_ok($blah, '==', 8);
++get_lex;
cmp_ok($in, '==', 8);
id(get_st) = 10;
cmp_ok($blah, '==', 10);
id(get_lex) = 10;
cmp_ok($in, '==', 10);
++id(get_st);
cmp_ok($blah, '==', 11);
++id(get_lex);
cmp_ok($in, '==', 11);
id1(get_st) = 20;
cmp_ok($blah, '==', 20);
id1(get_lex) = 20;
cmp_ok($in, '==', 20);
++id1(get_st);
cmp_ok($blah, '==', 21);
++id1(get_lex);
cmp_ok($in, '==', 21);
inc(get_st);
cmp_ok($blah, '==', 22);
inc(get_lex);
cmp_ok($in, '==', 22);
inc(id(get_st));
cmp_ok($blah, '==', 23);
inc(id(get_lex));
cmp_ok($in, '==', 23);
++inc(id1(id(get_st)));
cmp_ok($blah, '==', 25);
++inc(id1(id(get_lex)));
cmp_ok($in, '==', 25);
@a = (1) x 3;
@b = (undef) x 2;
$#c = 3; # These slots are not fillable.
# Explanation: empty slots contain &sv_undef.
=for disabled constructs
sub a3 :lvalue {@a}
sub b2 : lvalue {@b}
sub c4: lvalue {@c}
$_ = '';
eval <<'EOE' or $_ = $@;
($x, a3, $y, b2, $z, c4, $t) = (34 .. 78);
1;
EOE
#@out = ($x, a3, $y, b2, $z, c4, $t);
#@in = (34 .. 41, (undef) x 4, 46);
#print "# '@out' ne '@in'\nnot " unless "@out" eq "@in";
like($_, qr/Can\'t return an uninitialized value from lvalue subroutine/);
print "ok 22\n";
=cut
my $var;
sub a::var : lvalue { $var }
"a"->var = 45;
cmp_ok($var, '==', 45);
my $oo;
$o = bless \$oo, "a";
$o->var = 47;
cmp_ok($var, '==', 47);
sub o : lvalue { $o }
o->var = 49;
cmp_ok($var, '==', 49);
sub nolv () { $x0, $x1 } # Not lvalue
$_ = '';
eval <<'EOE' or $_ = $@;
nolv = (2,3);
1;
EOE
like($_, qr/Can\'t modify non-lvalue subroutine call in scalar assignment/);
$_ = '';
eval <<'EOE' or $_ = $@;
nolv = (2,3) if $_;
1;
EOE
like($_, qr/Can\'t modify non-lvalue subroutine call in scalar assignment/);
$_ = '';
eval <<'EOE' or $_ = $@;
&nolv = (2,3) if $_;
1;
EOE
like($_, qr/Can\'t modify non-lvalue subroutine call in scalar assignment/);
$x0 = $x1 = $_ = undef;
$nolv = \&nolv;
eval <<'EOE' or $_ = $@;
$nolv->() = (2,3) if $_;
1;
EOE
ok(!defined $_) or diag "'$_', '$x0', '$x1'";
$x0 = $x1 = $_ = undef;
$nolv = \&nolv;
eval <<'EOE' or $_ = $@;
$nolv->() = (2,3);
1;
EOE
like($_, qr/Can\'t modify non-lvalue subroutine call/)
or diag "'$_', '$x0', '$x1'";
sub lv0 : lvalue { }
sub rlv0 : lvalue { return }
$_ = undef;
eval <<'EOE' or $_ = $@;
lv0 = (2,3);
1;
EOE
like($_, qr/Can't return undef from lvalue subroutine/);
$_ = undef;
eval <<'EOE' or $_ = $@;
rlv0 = (2,3);
1;
EOE
like($_, qr/Can't return undef from lvalue subroutine/,
'explicit return of nothing in scalar context');
$_ = undef;
eval <<'EOE' or $_ = $@;
(lv0) = (2,3);
1;
EOE
ok(!defined $_) or diag $_;
$_ = undef;
eval <<'EOE' or $_ = $@;
(rlv0) = (2,3);
1;
EOE
ok(!defined $_, 'explicit return of nothing in list context') or diag $_;
($a,$b)=();
(lv0($a,$b)) = (3,4);
is +($a//'undef') . ($b//'undef'), 'undefundef',
'list assignment to empty lvalue sub';
sub lv1u :lvalue { undef }
sub rlv1u :lvalue { undef }
$_ = undef;
eval <<'EOE' or $_ = $@;
lv1u = (2,3);
1;
EOE
like($_, qr/Can't return undef from lvalue subroutine/);
$_ = undef;
eval <<'EOE' or $_ = $@;
rlv1u = (2,3);
1;
EOE
like($_, qr/Can't return undef from lvalue subroutine/,
'explicitly returning undef in scalar context');
$_ = undef;
eval <<'EOE' or $_ = $@;
(lv1u) = (2,3);
1;
EOE
ok(!defined, 'implicitly returning undef in list context');
$_ = undef;
eval <<'EOE' or $_ = $@;
(rlv1u) = (2,3);
1;
EOE
ok(!defined, 'explicitly returning undef in list context');
$x = '1234567';
$_ = undef;
eval <<'EOE' or $_ = $@;
sub lv1t : lvalue { index $x, 2 }
lv1t = (2,3);
1;
EOE
like($_, qr/Can\'t return a temporary from lvalue subroutine/);
$_ = undef;
eval <<'EOE' or $_ = $@;
sub rlv1t : lvalue { index $x, 2 }
rlv1t = (2,3);
1;
EOE
like($_, qr/Can\'t return a temporary from lvalue subroutine/,
'returning a PADTMP explicitly');
$_ = undef;
eval <<'EOE' or $_ = $@;
(rlv1t) = (2,3);
1;
EOE
like($_, qr/Can\'t return a temporary from lvalue subroutine/,
'returning a PADTMP explicitly (list context)');
# These next two tests are not necessarily normative. But this way we will
# know if this discrepancy changes.
$_ = undef;
eval <<'EOE' or $_ = $@;
sub scalarray : lvalue { @a || $b }
@a = 1;
(scalarray) = (2,3);
1;
EOE
like($_, qr/Can\'t return a temporary from lvalue subroutine/,
'returning a scalar-context array via ||');
$_ = undef;
eval <<'EOE' or $_ = $@;
use warnings "FATAL" => "all";
sub myscalarray : lvalue { my @a = 1; @a || $b }
(myscalarray) = (2,3);
1;
EOE
like($_, qr/Useless assignment to a temporary/,
'returning a scalar-context lexical array via ||');
$_ = undef;
sub lv2t : lvalue { shift }
(lv2t($_)) = (2,3);
is($_, 2);
$xxx = 'xxx';
sub xxx () { $xxx } # Not lvalue
$_ = undef;
eval <<'EOE' or $_ = $@;
sub lv1tmp : lvalue { xxx } # is it a TEMP?
lv1tmp = (2,3);
1;
EOE
like($_, qr/Can\'t modify non-lvalue subroutine call at /);
$_ = undef;
eval <<'EOE' or $_ = $@;
(lv1tmp) = (2,3);
1;
EOE
like($_, qr/Can\'t modify non-lvalue subroutine call at /);
sub yyy () { 'yyy' } # Const, not lvalue
$_ = undef;
eval <<'EOE' or $_ = $@;
sub lv1tmpr : lvalue { yyy } # is it read-only?
lv1tmpr = (2,3);
1;
EOE
like($_, qr/Can\'t return a readonly value from lvalue subroutine at/);
$_ = undef;
eval <<'EOE' or $_ = $@;
(lv1tmpr) = (2,3);
1;
EOE
like($_, qr/Can\'t return a readonly value from lvalue subroutine/);
sub lva : lvalue {@a}
$_ = undef;
@a = ();
$a[1] = 12;
eval <<'EOE' or $_ = $@;
(lva) = (2,3);
1;
EOE
is("'@a' $_", "'2 3' ");
$_ = undef;
@a = ();
$a[0] = undef;
$a[1] = 12;
eval <<'EOE' or $_ = $@;
(lva) = (2,3);
1;
EOE
is("'@a' $_", "'2 3' ");
is lva->${\sub { return $_[0] }}, 2,
'lvalue->$thing when lvalue returns array';
my @my = qw/ a b c /;
sub lvmya : lvalue { @my }
is lvmya->${\sub { return $_[0] }}, 3,
'lvalue->$thing when lvalue returns lexical array';
sub lv1n : lvalue { $newvar }
$_ = undef;
eval <<'EOE' or $_ = $@;
lv1n = (3,4);
1;
EOE
is("'$newvar' $_", "'4' ");
sub lv1nn : lvalue { $nnewvar }
$_ = undef;
eval <<'EOE' or $_ = $@;
(lv1nn) = (3,4);
1;
EOE
is("'$nnewvar' $_", "'3' ");
$a = \&lv1nn;
$a->() = 8;
is($nnewvar, '8');
eval 'sub AUTOLOAD : lvalue { $newvar }';
foobar() = 12;
is($newvar, "12");
# But autoloading should only be triggered by a call to an undefined
# subroutine.
&{"lv1nn"} = 14;
is $newvar, 12, 'AUTOLOAD does not take precedence over lvalue sub';
eval { &{"xxx"} = 14 };
is $newvar, 12, 'AUTOLOAD does not take precedence over non-lvalue sub';
{
my %hash; my @array;
sub alv : lvalue { $array[1] }
sub alv2 : lvalue { $array[$_[0]] }
sub hlv : lvalue { $hash{"foo"} }
sub hlv2 : lvalue { $hash{$_[0]} }
$array[1] = "not ok 51\n";
alv() = "ok 50\n";
is(alv(), "ok 50\n");
alv2(20) = "ok 51\n";
is($array[20], "ok 51\n");
$hash{"foo"} = "not ok 52\n";
hlv() = "ok 52\n";
is($hash{foo}, "ok 52\n");
$hash{bar} = "not ok 53\n";
hlv("bar") = "ok 53\n";
is(hlv("bar"), "ok 53\n");
sub array : lvalue { @array }
sub array2 : lvalue { @array2 } # This is a global.
sub hash : lvalue { %hash }
sub hash2 : lvalue { %hash2 } # So's this.
@array2 = qw(foo bar);
%hash2 = qw(foo bar);
(array()) = qw(ok 54);
is("@array", "ok 54");
(array2()) = qw(ok 55);
is("@array2", "ok 55");
(hash()) = qw(ok 56);
cmp_ok($hash{ok}, '==', 56);
(hash2()) = qw(ok 57);
cmp_ok($hash2{ok}, '==', 57);
@array = qw(a b c d);
sub aslice1 : lvalue { @array[0,2] };
(aslice1()) = ("ok", "already");
is("@array", "ok b already d");
@array2 = qw(a B c d);
sub aslice2 : lvalue { @array2[0,2] };
(aslice2()) = ("ok", "already");
is("@array2", "ok B already d");
%hash = qw(a Alpha b Beta c Gamma);
sub hslice : lvalue { @hash{"c", "b"} }
(hslice()) = ("CISC", "BogoMIPS");
is(join("/",@hash{"c","a","b"}), "CISC/Alpha/BogoMIPS");
}
$str = "Hello, world!";
sub sstr : lvalue { substr($str, 1, 4) }
sstr() = "i";
is($str, "Hi, world!");
$str = "Made w/ JavaScript";
sub veclv : lvalue { vec($str, 2, 32) }
if (ord('A') != 193) {
veclv() = 0x5065726C;
}
else { # EBCDIC?
veclv() = 0xD7859993;
}
is($str, "Made w/ PerlScript");
sub position : lvalue { pos }
@p = ();
$_ = "fee fi fo fum";
while (/f/g) {
push @p, position;
position() += 6;
}
is("@p", "1 8");
sub keeze : lvalue { keys %__ }
%__ = ("a","b");
keeze = 64;
is scalar %__, '1/64', 'keys assignment through lvalue sub';
# Bug 20001223.002: split thought that the list had only one element
@ary = qw(4 5 6);
sub lval1 : lvalue { $ary[0]; }
sub lval2 : lvalue { $ary[1]; }
(lval1(), lval2()) = split ' ', "1 2 3 4";
is(join(':', @ary), "1:2:6");
# check that an element of a tied hash/array can be assigned to via lvalueness
package Tie_Hash;
our ($key, $val);
sub TIEHASH { bless \my $v => __PACKAGE__ }
sub STORE { ($key, $val) = @_[1,2] }
package main;
sub lval_tie_hash : lvalue {
tie my %t => 'Tie_Hash';
$t{key};
}
eval { lval_tie_hash() = "value"; };
is($@, "", "element of tied hash");
is("$Tie_Hash::key-$Tie_Hash::val", "key-value");
package Tie_Array;
our @val;
sub TIEARRAY { bless \my $v => __PACKAGE__ }
sub STORE { $val[ $_[1] ] = $_[2] }
package main;
sub lval_tie_array : lvalue {
tie my @t => 'Tie_Array';
$t[0];
}
eval { lval_tie_array() = "value"; };
is($@, "", "element of tied array");
is ($Tie_Array::val[0], "value");
# Check that tied pad vars that are returned can be assigned to
sub TIESCALAR { bless [] }
sub STORE {$wheel = $_[1]}
sub FETCH {$wheel}
sub tied_pad_var :lvalue { tie my $tyre, ''; $tyre }
sub tied_pad_varr :lvalue { tie my $tyre, ''; return $tyre }
tied_pad_var = 1;
is $wheel, 1, 'tied pad var returned in scalar lvalue context';
tied_pad_var->${\sub{ $_[0] = 2 }};
is $wheel, 2, 'tied pad var returned in scalar ref context';
(tied_pad_var) = 3;
is $wheel, 3, 'tied pad var returned in list lvalue context';
$_ = 4 for tied_pad_var;
is $wheel, 4, 'tied pad var returned in list ref context';
tied_pad_varr = 5;
is $wheel, 5, 'tied pad var explicitly returned in scalar lvalue context';
tied_pad_varr->${\sub{ $_[0] = 6 }};
is $wheel, 6, 'tied pad var explicitly returned in scalar ref context';
(tied_pad_varr) = 7;
is $wheel, 7, 'tied pad var explicitly returned in list lvalue context';
$_ = 8 for tied_pad_varr;
is $wheel, 8, 'tied pad var explicitly returned in list ref context';
# Test explicit return of lvalue expression
{
# subs are copies from tests 1-~18 with an explicit return added.
# They used not to work, which is why they are ‘badly’ named.
sub bad_get_lex : lvalue { return $in };
sub bad_get_st : lvalue { return $blah }
sub bad_id : lvalue { return ${\shift} }
sub bad_id1 : lvalue { return $_[0] }
sub bad_inc : lvalue { return ${\++$_[0]} }
$in = 5;
$blah = 3;
bad_get_st = 7;
is( $blah, 7 );
bad_get_lex = 7;
is($in, 7, "yada");
++bad_get_st;
is($blah, 8, "yada");
++bad_get_lex;
cmp_ok($in, '==', 8);
bad_id(bad_get_st) = 10;
cmp_ok($blah, '==', 10);
bad_id(bad_get_lex) = 10;
cmp_ok($in, '==', 10);
++bad_id(bad_get_st);
cmp_ok($blah, '==', 11);
++bad_id(bad_get_lex);
cmp_ok($in, '==', 11);
bad_id1(bad_get_st) = 20;
cmp_ok($blah, '==', 20);
bad_id1(bad_get_lex) = 20;
cmp_ok($in, '==', 20);
++bad_id1(bad_get_st);
cmp_ok($blah, '==', 21);
++bad_id1(bad_get_lex);
cmp_ok($in, '==', 21);
bad_inc(bad_get_st);
cmp_ok($blah, '==', 22);
bad_inc(bad_get_lex);
cmp_ok($in, '==', 22);
bad_inc(bad_id(bad_get_st));
cmp_ok($blah, '==', 23);
bad_inc(bad_id(bad_get_lex));
cmp_ok($in, '==', 23);
++bad_inc(bad_id1(bad_id(bad_get_st)));
cmp_ok($blah, '==', 25);
++bad_inc(bad_id1(bad_id(bad_get_lex)));
cmp_ok($in, '==', 25);
# Recursive
my $r;
my $to_modify;
$r = sub :lvalue {
my $depth = shift//0;
if ($depth == 2) { return $to_modify }
return &$r($depth+1);
};
&$r(0) = 7;
is $to_modify, 7, 'recursive lvalue sub';
# Recursive with substr [perl #72706]
my $val = '';
my $pie;
$pie = sub :lvalue {
my $depth = shift;
return &$pie($depth) if $depth--;
substr $val, 0;
};
for my $depth (0, 1, 2) {
my $value = "Good $depth";
eval {
&$pie($depth) = $value;
};
is($@, '', "recursive lvalue substr return depth $depth");
is($val, $value,
"value assigned to recursive lvalue substr (depth $depth)");
}
}
{ # bug #23790
my @arr = qw /one two three/;
my $line = "zero";
sub lval_array () : lvalue {@arr}
for (lval_array) {
$line .= $_;
}
is($line, "zeroonetwothree");
sub trythislval { scalar(@_)."x".join "", @_ }
is(trythislval(lval_array()), "3xonetwothree");
sub changeme { $_[2] = "free" }
changeme(lval_array);
is("@arr", "one two free");
# test again, with explicit return
sub rlval_array() : lvalue {return @arr}
@arr = qw /one two three/;
$line = "zero";
for (rlval_array) {
$line .= $_;
}
is($line, "zeroonetwothree");
is(trythislval(rlval_array()), "3xonetwothree");
changeme(rlval_array);
is("@arr", "one two free");
# Variations on the same theme, with multiple vars returned
my $scalar = 'half';
sub lval_scalar_array () : lvalue { $scalar, @arr }
@arr = qw /one two three/;
$line = "zero";
for (lval_scalar_array) {
$line .= $_;
}
is($line, "zerohalfonetwothree");
is(trythislval(lval_scalar_array()), "4xhalfonetwothree");
changeme(lval_scalar_array);
is("@arr", "one free three");
sub lval_array_scalar () : lvalue { @arr, $scalar }
@arr = qw /one two three/;
$line = "zero";
$scalar = 'four';
for (lval_array_scalar) {
$line .= $_;
}
is($line, "zeroonetwothreefour");
is(trythislval(lval_array_scalar()), "4xonetwothreefour");
changeme(lval_array_scalar);
is("@arr", "one two free");
# Tests for specific ops not tested above
# rv2av
@array2 = qw 'one two free';
is join(',', map $_, sub:lvalue{@array2}->()), 'one,two,free',
'rv2av in reference context';
is join(',', map $_, sub:lvalue{@{\@array2}}->()), 'one,two,free',
'rv2av-with-ref in reference context';
# padhv
my %hash = qw[a b c d];
like join(',', map $_, sub:lvalue{%hash}->()),
qr/^(?:a,b,c,d|c,d,a,b)\z/, 'padhv in reference context';
# rv2hv
%hash2 = qw[a b c d];
like join(',', map $_, sub:lvalue{%hash2}->()),
qr/^(?:a,b,c,d|c,d,a,b)\z/, 'rv2hv in reference context';
like join(',', map $_, sub:lvalue{%{\%hash2}}->()),
qr/^(?:a,b,c,d|c,d,a,b)\z/, 'rv2hv-with-ref in reference context';
}
{
package Foo;
sub AUTOLOAD :lvalue { *{$AUTOLOAD} };
package main;
my $foo = bless {},"Foo";
my $result;
$foo->bar = sub { $result = "bar" };
$foo->bar;
is ($result, 'bar', "RT #41550");
}
SKIP: { skip 'no attributes.pm', 1 unless eval 'require attributes';
fresh_perl_is(<<'----', <<'====', {}, "lvalue can not be set after definition. [perl #68758]");
use warnings;
our $x;
sub foo { $x }
sub foo : lvalue;
sub MODIFY_CODE_ATTRIBUTES {}
sub foo : lvalue : fr0g;
foo = 3;
----
lvalue attribute ignored after the subroutine has been defined at - line 4.
lvalue attribute ignored after the subroutine has been defined at - line 6.
Can't modify non-lvalue subroutine call in scalar assignment at - line 7, near "3;"
Execution of - aborted due to compilation errors.
====
}
{
my $x;
sub lval_decl : lvalue;
sub lval_decl { $x }
lval_decl = 5;
is($x, 5, "subroutine declared with lvalue before definition retains lvalue. [perl #68758]");
}
SKIP: { skip "no attributes.pm", 2 unless eval { require attributes };
sub utf8::valid :lvalue;
require attributes;
is "@{[ &attributes::get(\&utf8::valid) ]}", 'lvalue',
'sub declaration with :lvalue applies it to XSUBs';
BEGIN { *wonky = \&marjibberous }
sub wonky :lvalue;
is "@{[ &attributes::get(\&wonky) ]}", 'lvalue',
'sub declaration with :lvalue applies it to assigned stub';
}
sub fleen : lvalue { $pnare }
$pnare = __PACKAGE__;
ok eval { fleen = 1 }, "lvalues can return COWs (CATTLE?) [perl #75656]";\
is $pnare, 1, 'and returning CATTLE actually works';
$pnare = __PACKAGE__;
ok eval { (fleen) = 1 }, "lvalues can return COWs in list context";
is $pnare, 1, 'and returning COWs in list context actually works';
$pnare = __PACKAGE__;
ok eval { $_ = 1 for(fleen); 1 }, "lvalues can return COWs in ref cx";
is $pnare, 1, 'and returning COWs in reference context actually works';
# Returning an arbitrary expression, not necessarily lvalue
+sub :lvalue { return $ambaga || $ambaga }->() = 73;
is $ambaga, 73, 'explicit return of arbitrary expression (scalar context)';
(sub :lvalue { return $ambaga || $ambaga }->()) = 74;
is $ambaga, 74, 'explicit return of arbitrary expression (list context)';
+sub :lvalue { $ambaga || $ambaga }->() = 73;
is $ambaga, 73, 'implicit return of arbitrary expression (scalar context)';
(sub :lvalue { $ambaga || $ambaga }->()) = 74;
is $ambaga, 74, 'implicit return of arbitrary expression (list context)';
eval { +sub :lvalue { return 3 }->() = 4 };
like $@, qr/Can\'t return a readonly value from lvalue subroutine at/,
'assignment to numeric constant explicitly returned from lv sub';
eval { (sub :lvalue { return 3 }->()) = 4 };
like $@, qr/Can\'t return a readonly value from lvalue subroutine at/,
'assignment to num constant explicitly returned (list cx)';
eval { +sub :lvalue { 3 }->() = 4 };
like $@, qr/Can\'t return a readonly value from lvalue subroutine at/,
'assignment to numeric constant implicitly returned from lv sub';
eval { (sub :lvalue { 3 }->()) = 4 };
like $@, qr/Can\'t return a readonly value from lvalue subroutine at/,
'assignment to num constant implicitly returned (list cx)';
# reference (potential lvalue) context
$suffix = '';
for my $sub (sub :lvalue {$_}, sub :lvalue {return $_}) {
&$sub()->${\sub { $_[0] = 37 }};
is $_, '37', 'lvalue->method'.$suffix;
${\scalar &$sub()} = 38;
is $_, '38', 'scalar(lvalue)'.$suffix;
sub assign39_with_proto ($) { $_[0] = 39 }
assign39_with_proto(&$sub());
is $_, '39', 'func(lvalue) when func has $ proto'.$suffix;
$_ = 1;
${\(&$sub()||undef)} = 40;
is $_, '40', 'lvalue||...'.$suffix;
${\(${\undef}||&$sub())} = 41; # extra ${\...} to bypass const folding
is $_, '41', '...||lvalue'.$suffix;
$_ = 0;
${\(&$sub()&&undef)} = 42;
is $_, '42', 'lvalue&&...'.$suffix;
${\(${\1}&&&$sub())} = 43;
is $_, '43', '...&&lvalue'.$suffix;
${\(&$sub())[0]} = 44;
is $_, '44', '(lvalue)[0]'.$suffix;
}
continue { $suffix = ' (explicit return)' }
# autovivification
$suffix = '';
for my $sub (sub :lvalue {$_}, sub :lvalue {return $_}) {
undef $_;
&$sub()->[3] = 4;
is $_->[3], 4, 'func->[...] autovivification'.$suffix;
undef $_;
&$sub()->{3} = 4;
is $_->{3}, 4, 'func->{...} autovivification'.$suffix;
undef $_;
${&$sub()} = 4;
is $$_, 4, '${func()} autovivification' .$suffix;
undef $_;
@{&$sub()} = 4;
is "@$_", 4, '@{func()} autovivification' .$suffix;
undef $_;
%{&$sub()} = (4,5);
is join('-',%$_), '4-5', '%{func()} autovivification'.$suffix;
undef $_;
${ (), &$sub()} = 4;
is $$_, 4, '${ (), func()} autovivification' .$suffix;
}
continue { $suffix = ' (explicit return)' }
# [perl #92406] [perl #92290] Returning a pad var in rvalue context
$suffix = '';
for my $sub (
sub :lvalue { my $x = 72; $x },
sub :lvalue { my $x = 72; return $x }
) {
is scalar(&$sub), 72, "sub returning pad var in scalar context$suffix";
is +(&$sub)[0], 72, "sub returning pad var in list context$suffix";
}
continue { $suffix = ' (explicit return)' }
# Returning read-only values in reference context
$suffix = '';
for (
sub :lvalue { $] }->(),
sub :lvalue { return $] }->()
) {
is \$_, \$], 'read-only values are returned in reference context'
.$suffix # (they used to be copied)
}
continue { $suffix = ' (explicit return)' }
# Returning unwritables from nested lvalue sub call in in rvalue context
# First, ensure we are testing what we think we are:
if (!Internals::SvREADONLY($])) { Internals::SvREADONLY($],1); }
sub squibble : lvalue { return $] }
sub squebble : lvalue { squibble }
sub squabble : lvalue { return squibble }
is $x = squebble, $], 'returning ro from nested lv sub call in rv cx';
is $x = squabble, $], 'explct. returning ro from nested lv sub in rv cx';
is \squebble, \$], 'returning ro from nested lv sub call in ref cx';
is \squabble, \$], 'explct. returning ro from nested lv sub in ref cx';
# [perl #102486] Sub calls as the last statement of an lvalue sub
package _102486 {
my $called;
my $x = 'nonlv';
sub strictlv :lvalue { use strict 'refs'; &$x }
sub lv :lvalue { &$x }
sub nonlv { ++$called }
eval { strictlv };
::like $@, qr/^Can't use string \("nonlv"\) as a subroutine ref while/,
'strict mode applies to sub:lvalue{ &$string }';
$called = 0;
::ok eval { lv },
'sub:lvalue{&$x}->() does not die for non-lvalue inner sub call';
::is $called, 1, 'The &$x actually called the sub';
eval { +sub :lvalue { &$x }->() = 3 };
::like $@, qr/^Can't modify non-lvalue subroutine call at /,
'sub:lvalue{&$x}->() dies in true lvalue context';
}
# TARG should be copied in rvalue context
sub ucf :lvalue { ucfirst $_[0] }
is ucf("just another ") . ucf("perl hacker,\n"),
"Just another Perl hacker,\n", 'TARG is copied in rvalue scalar cx';
is join('',ucf("just another "), ucf "perl hacker,\n"),
"Just another Perl hacker,\n", 'TARG is copied in rvalue list cx';
sub ucfr : lvalue {
@_ ? ucfirst $_[0] : do {
is ucfr("just another ") . ucfr("perl hacker,\n"),
"Just another Perl hacker,\n",
'TARG is copied in recursive rvalue scalar cx';
is join('',ucfr("just another "), ucfr("perl hacker,\n")),
"Just another Perl hacker,\n",
'TARG is copied in recursive rvalue list cx';
}
}
ucfr();
# Test TARG with potential lvalue context, too
for (sub : lvalue { "$x" }->()) {
is \$_, \$_, '\$_ == \$_ in for(sub :lvalue{"$x"}->()){...}'
}
# [perl #117947] XSUBs should not be treated as lvalues at run time
eval { &{\&utf8::is_utf8}("") = 3 };
like $@, qr/^Can't modify non-lvalue subroutine call at /,
'XSUB not seen at compile time dies in lvalue context';
# [perl #119797] else implicitly returning value
# This used to cause Bizarre copy of ARRAY in pp_leave
sub else119797 : lvalue {
if ($_[0]) {
1; # two statements force a leave op
@119797
}
else {
@119797
}
}
eval { (else119797(0)) = 1..3 };
is $@, "", '$@ after writing to array returned by else';
is "@119797", "1 2 3", 'writing to array returned by else';
eval { (else119797(1)) = 4..6 };
is $@, "", '$@ after writing to array returned by if (with else)';
is "@119797", "4 5 6", 'writing to array returned by if (with else)';
sub if119797 : lvalue {
if ($_[0]) {
@119797
}
}
@119797 = ();
eval { (if119797(1)) = 4..6 };
is $@, "", '$@ after writing to array returned by if';
is "@119797", "4 5 6", 'writing to array returned by if';
sub unless119797 : lvalue {
unless ($_[0]) {
@119797
}
}
@119797 = ();
eval { (unless119797(0)) = 4..6 };
is $@, "", '$@ after writing to array returned by unless';
is "@119797", "4 5 6", 'writing to array returned by unless';
sub bare119797 : lvalue {
{;
@119797
}
}
@119797 = ();
eval { (bare119797(0)) = 4..6 };
is $@, "", '$@ after writing to array returned by bare block';
is "@119797", "4 5 6", 'writing to array returned by bare block';
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