8 sub a : lvalue { my $a = 34; ${\(bless \$a)} } # Return a temporary
9 sub b : lvalue { ${\shift} }
11 my $out = a(b()); # Check that temporaries are allowed.
12 is(ref $out, 'main'); # Not reached if error.
14 my @out = grep /main/, a(b()); # Check that temporaries are allowed.
15 cmp_ok(scalar @out, '==', 1); # Not reached if error.
19 # Check that we can return localized values from subroutines:
21 sub in : lvalue { $in = shift; }
22 sub neg : lvalue { #(num_str) return num_str
32 sub get_lex : lvalue { $in }
33 sub get_st : lvalue { $blah }
34 sub id : lvalue { ${\shift} }
35 sub id1 : lvalue { $_[0] }
36 sub inc : lvalue { ${\++$_[0]} }
43 cmp_ok($blah, '==', 7);
51 cmp_ok($blah, '==', 8);
59 cmp_ok($blah, '==', 10);
63 cmp_ok($in, '==', 10);
67 cmp_ok($blah, '==', 11);
71 cmp_ok($in, '==', 11);
75 cmp_ok($blah, '==', 20);
79 cmp_ok($in, '==', 20);
83 cmp_ok($blah, '==', 21);
87 cmp_ok($in, '==', 21);
91 cmp_ok($blah, '==', 22);
95 cmp_ok($in, '==', 22);
99 cmp_ok($blah, '==', 23);
103 cmp_ok($in, '==', 23);
105 ++inc(id1(id(get_st)));
107 cmp_ok($blah, '==', 25);
109 ++inc(id1(id(get_lex)));
111 cmp_ok($in, '==', 25);
115 $#c = 3; # These slots are not fillable.
117 # Explanation: empty slots contain &sv_undef.
119 =for disabled constructs
127 eval <<'EOE' or $_ = $@;
128 ($x, a3, $y, b2, $z, c4, $t) = (34 .. 78);
132 #@out = ($x, a3, $y, b2, $z, c4, $t);
133 #@in = (34 .. 41, (undef) x 4, 46);
134 #print "# '@out' ne '@in'\nnot " unless "@out" eq "@in";
136 like($_, qr/Can\'t return an uninitialized value from lvalue subroutine/);
144 sub a::var : lvalue { $var }
148 cmp_ok($var, '==', 45);
151 $o = bless \$oo, "a";
155 cmp_ok($var, '==', 47);
157 sub o : lvalue { $o }
161 cmp_ok($var, '==', 49);
163 sub nolv () { $x0, $x1 } # Not lvalue
167 eval <<'EOE' or $_ = $@;
172 like($_, qr/Can\'t modify non-lvalue subroutine call in scalar assignment/);
176 eval <<'EOE' or $_ = $@;
181 like($_, qr/Can\'t modify non-lvalue subroutine call in scalar assignment/);
185 eval <<'EOE' or $_ = $@;
190 like($_, qr/Can\'t modify non-lvalue subroutine call in scalar assignment/);
192 $x0 = $x1 = $_ = undef;
195 eval <<'EOE' or $_ = $@;
196 $nolv->() = (2,3) if $_;
200 ok(!defined $_) or diag "'$_', '$x0', '$x1'";
202 $x0 = $x1 = $_ = undef;
205 eval <<'EOE' or $_ = $@;
210 like($_, qr/Can\'t modify non-lvalue subroutine call/)
211 or diag "'$_', '$x0', '$x1'";
214 sub rlv0 : lvalue { return }
217 eval <<'EOE' or $_ = $@;
222 like($_, qr/Can't return undef from lvalue subroutine/);
225 eval <<'EOE' or $_ = $@;
230 like($_, qr/Can't return undef from lvalue subroutine/,
231 'explicit return of nothing in scalar context');
234 eval <<'EOE' or $_ = $@;
239 ok(!defined $_) or diag $_;
242 eval <<'EOE' or $_ = $@;
247 ok(!defined $_, 'explicit return of nothing in list context') or diag $_;
250 (lv0($a,$b)) = (3,4);
251 is +($a//'undef') . ($b//'undef'), 'undefundef',
252 'list assignment to empty lvalue sub';
255 sub lv1u :lvalue { undef }
256 sub rlv1u :lvalue { undef }
259 eval <<'EOE' or $_ = $@;
264 like($_, qr/Can't return undef from lvalue subroutine/);
267 eval <<'EOE' or $_ = $@;
272 like($_, qr/Can't return undef from lvalue subroutine/,
273 'explicitly returning undef in scalar context');
276 eval <<'EOE' or $_ = $@;
281 ok(!defined, 'implicitly returning undef in list context');
284 eval <<'EOE' or $_ = $@;
289 ok(!defined, 'explicitly returning undef in list context');
294 eval <<'EOE' or $_ = $@;
295 sub lv1t : lvalue { index $x, 2 }
300 like($_, qr/Can\'t return a temporary from lvalue subroutine/);
303 eval <<'EOE' or $_ = $@;
304 sub rlv1t : lvalue { index $x, 2 }
309 like($_, qr/Can\'t return a temporary from lvalue subroutine/,
310 'returning a PADTMP explicitly');
313 eval <<'EOE' or $_ = $@;
318 like($_, qr/Can\'t return a temporary from lvalue subroutine/,
319 'returning a PADTMP explicitly (list context)');
321 # These next two tests are not necessarily normative. But this way we will
322 # know if this discrepancy changes.
325 eval <<'EOE' or $_ = $@;
326 sub scalarray : lvalue { @a || $b }
332 like($_, qr/Can\'t return a temporary from lvalue subroutine/,
333 'returning a scalar-context array via ||');
336 eval <<'EOE' or $_ = $@;
337 use warnings "FATAL" => "all";
338 sub myscalarray : lvalue { my @a = 1; @a || $b }
339 (myscalarray) = (2,3);
343 like($_, qr/Useless assignment to a temporary/,
344 'returning a scalar-context lexical array via ||');
347 sub lv2t : lvalue { shift }
352 sub xxx () { $xxx } # Not lvalue
355 eval <<'EOE' or $_ = $@;
356 sub lv1tmp : lvalue { xxx } # is it a TEMP?
361 like($_, qr/Can\'t modify non-lvalue subroutine call at /);
364 eval <<'EOE' or $_ = $@;
369 like($_, qr/Can\'t modify non-lvalue subroutine call at /);
371 sub yyy () { 'yyy' } # Const, not lvalue
374 eval <<'EOE' or $_ = $@;
375 sub lv1tmpr : lvalue { yyy } # is it read-only?
380 like($_, qr/Can\'t return a readonly value from lvalue subroutine at/);
383 eval <<'EOE' or $_ = $@;
388 like($_, qr/Can\'t return a readonly value from lvalue subroutine/);
391 sub lv2tmpr : lvalue { my $x = *foo; Internals::SvREADONLY $x, 1; $x }
395 like($@, qr/Can\'t return a readonly value from lvalue subroutine at/);
401 like($@, qr/Can\'t return a readonly value from lvalue subroutine/);
403 sub lva : lvalue {@a}
408 eval <<'EOE' or $_ = $@;
413 is("'@a' $_", "'2 3' ");
419 eval <<'EOE' or $_ = $@;
424 is("'@a' $_", "'2 3' ");
426 is lva->${\sub { return $_[0] }}, 2,
427 'lvalue->$thing when lvalue returns array';
429 my @my = qw/ a b c /;
430 sub lvmya : lvalue { @my }
432 is lvmya->${\sub { return $_[0] }}, 3,
433 'lvalue->$thing when lvalue returns lexical array';
435 sub lv1n : lvalue { $newvar }
438 eval <<'EOE' or $_ = $@;
443 is("'$newvar' $_", "'4' ");
445 sub lv1nn : lvalue { $nnewvar }
448 eval <<'EOE' or $_ = $@;
453 is("'$nnewvar' $_", "'3' ");
459 eval 'sub AUTOLOAD : lvalue { $newvar }';
463 # But autoloading should only be triggered by a call to an undefined
466 is $newvar, 12, 'AUTOLOAD does not take precedence over lvalue sub';
467 eval { &{"xxx"} = 14 };
468 is $newvar, 12, 'AUTOLOAD does not take precedence over non-lvalue sub';
472 sub alv : lvalue { $array[1] }
473 sub alv2 : lvalue { $array[$_[0]] }
474 sub hlv : lvalue { $hash{"foo"} }
475 sub hlv2 : lvalue { $hash{$_[0]} }
476 $array[1] = "not ok 51\n";
478 is(alv(), "ok 50\n");
480 alv2(20) = "ok 51\n";
481 is($array[20], "ok 51\n");
483 $hash{"foo"} = "not ok 52\n";
485 is($hash{foo}, "ok 52\n");
487 $hash{bar} = "not ok 53\n";
488 hlv("bar") = "ok 53\n";
489 is(hlv("bar"), "ok 53\n");
491 sub array : lvalue { @array }
492 sub array2 : lvalue { @array2 } # This is a global.
493 sub hash : lvalue { %hash }
494 sub hash2 : lvalue { %hash2 } # So's this.
495 @array2 = qw(foo bar);
496 %hash2 = qw(foo bar);
498 (array()) = qw(ok 54);
499 is("@array", "ok 54");
501 (array2()) = qw(ok 55);
502 is("@array2", "ok 55");
504 (hash()) = qw(ok 56);
505 cmp_ok($hash{ok}, '==', 56);
507 (hash2()) = qw(ok 57);
508 cmp_ok($hash2{ok}, '==', 57);
510 @array = qw(a b c d);
511 sub aslice1 : lvalue { @array[0,2] };
512 (aslice1()) = ("ok", "already");
513 is("@array", "ok b already d");
515 @array2 = qw(a B c d);
516 sub aslice2 : lvalue { @array2[0,2] };
517 (aslice2()) = ("ok", "already");
518 is("@array2", "ok B already d");
520 %hash = qw(a Alpha b Beta c Gamma);
521 sub hslice : lvalue { @hash{"c", "b"} }
522 (hslice()) = ("CISC", "BogoMIPS");
523 is(join("/",@hash{"c","a","b"}), "CISC/Alpha/BogoMIPS");
526 $str = "Hello, world!";
527 sub sstr : lvalue { substr($str, 1, 4) }
529 is($str, "Hi, world!");
531 $str = "Made w/ JavaScript";
532 sub veclv : lvalue { vec($str, 2, 32) }
533 if (ord('A') != 193) {
534 veclv() = 0x5065726C;
537 veclv() = 0xD7859993;
539 is($str, "Made w/ PerlScript");
541 sub position : lvalue { pos }
543 $_ = "fee fi fo fum";
550 sub keeze : lvalue { keys %__ }
553 is scalar %__, '1/64', 'keys assignment through lvalue sub';
555 # Bug 20001223.002: split thought that the list had only one element
557 sub lval1 : lvalue { $ary[0]; }
558 sub lval2 : lvalue { $ary[1]; }
559 (lval1(), lval2()) = split ' ', "1 2 3 4";
561 is(join(':', @ary), "1:2:6");
563 # check that an element of a tied hash/array can be assigned to via lvalueness
568 sub TIEHASH { bless \my $v => __PACKAGE__ }
569 sub STORE { ($key, $val) = @_[1,2] }
572 sub lval_tie_hash : lvalue {
573 tie my %t => 'Tie_Hash';
577 eval { lval_tie_hash() = "value"; };
579 is($@, "", "element of tied hash");
581 is("$Tie_Hash::key-$Tie_Hash::val", "key-value");
587 sub TIEARRAY { bless \my $v => __PACKAGE__ }
588 sub STORE { $val[ $_[1] ] = $_[2] }
591 sub lval_tie_array : lvalue {
592 tie my @t => 'Tie_Array';
596 eval { lval_tie_array() = "value"; };
599 is($@, "", "element of tied array");
601 is ($Tie_Array::val[0], "value");
604 # Check that tied pad vars that are returned can be assigned to
605 sub TIESCALAR { bless [] }
606 sub STORE {$wheel = $_[1]}
608 sub tied_pad_var :lvalue { tie my $tyre, ''; $tyre }
609 sub tied_pad_varr :lvalue { tie my $tyre, ''; return $tyre }
611 is $wheel, 1, 'tied pad var returned in scalar lvalue context';
612 tied_pad_var->${\sub{ $_[0] = 2 }};
613 is $wheel, 2, 'tied pad var returned in scalar ref context';
615 is $wheel, 3, 'tied pad var returned in list lvalue context';
616 $_ = 4 for tied_pad_var;
617 is $wheel, 4, 'tied pad var returned in list ref context';
619 is $wheel, 5, 'tied pad var explicitly returned in scalar lvalue context';
620 tied_pad_varr->${\sub{ $_[0] = 6 }};
621 is $wheel, 6, 'tied pad var explicitly returned in scalar ref context';
623 is $wheel, 7, 'tied pad var explicitly returned in list lvalue context';
624 $_ = 8 for tied_pad_varr;
625 is $wheel, 8, 'tied pad var explicitly returned in list ref context';
628 # Test explicit return of lvalue expression
630 # subs are copies from tests 1-~18 with an explicit return added.
631 # They used not to work, which is why they are ‘badly’ named.
632 sub bad_get_lex : lvalue { return $in };
633 sub bad_get_st : lvalue { return $blah }
635 sub bad_id : lvalue { return ${\shift} }
636 sub bad_id1 : lvalue { return $_[0] }
637 sub bad_inc : lvalue { return ${\++$_[0]} }
652 is($blah, 8, "yada");
655 cmp_ok($in, '==', 8);
657 bad_id(bad_get_st) = 10;
658 cmp_ok($blah, '==', 10);
660 bad_id(bad_get_lex) = 10;
661 cmp_ok($in, '==', 10);
663 ++bad_id(bad_get_st);
664 cmp_ok($blah, '==', 11);
666 ++bad_id(bad_get_lex);
667 cmp_ok($in, '==', 11);
669 bad_id1(bad_get_st) = 20;
670 cmp_ok($blah, '==', 20);
672 bad_id1(bad_get_lex) = 20;
673 cmp_ok($in, '==', 20);
675 ++bad_id1(bad_get_st);
676 cmp_ok($blah, '==', 21);
678 ++bad_id1(bad_get_lex);
679 cmp_ok($in, '==', 21);
682 cmp_ok($blah, '==', 22);
684 bad_inc(bad_get_lex);
685 cmp_ok($in, '==', 22);
687 bad_inc(bad_id(bad_get_st));
688 cmp_ok($blah, '==', 23);
690 bad_inc(bad_id(bad_get_lex));
691 cmp_ok($in, '==', 23);
693 ++bad_inc(bad_id1(bad_id(bad_get_st)));
694 cmp_ok($blah, '==', 25);
696 ++bad_inc(bad_id1(bad_id(bad_get_lex)));
697 cmp_ok($in, '==', 25);
703 my $depth = shift//0;
704 if ($depth == 2) { return $to_modify }
705 return &$r($depth+1);
708 is $to_modify, 7, 'recursive lvalue sub';
710 # Recursive with substr [perl #72706]
715 return &$pie($depth) if $depth--;
718 for my $depth (0, 1, 2) {
719 my $value = "Good $depth";
721 &$pie($depth) = $value;
723 is($@, '', "recursive lvalue substr return depth $depth");
725 "value assigned to recursive lvalue substr (depth $depth)");
730 my @arr = qw /one two three/;
732 sub lval_array () : lvalue {@arr}
738 is($line, "zeroonetwothree");
740 sub trythislval { scalar(@_)."x".join "", @_ }
741 is(trythislval(lval_array()), "3xonetwothree");
743 sub changeme { $_[2] = "free" }
744 changeme(lval_array);
745 is("@arr", "one two free");
747 # test again, with explicit return
748 sub rlval_array() : lvalue {return @arr}
749 @arr = qw /one two three/;
754 is($line, "zeroonetwothree");
755 is(trythislval(rlval_array()), "3xonetwothree");
756 changeme(rlval_array);
757 is("@arr", "one two free");
759 # Variations on the same theme, with multiple vars returned
761 sub lval_scalar_array () : lvalue { $scalar, @arr }
762 @arr = qw /one two three/;
764 for (lval_scalar_array) {
767 is($line, "zerohalfonetwothree");
768 is(trythislval(lval_scalar_array()), "4xhalfonetwothree");
769 changeme(lval_scalar_array);
770 is("@arr", "one free three");
772 sub lval_array_scalar () : lvalue { @arr, $scalar }
773 @arr = qw /one two three/;
776 for (lval_array_scalar) {
779 is($line, "zeroonetwothreefour");
780 is(trythislval(lval_array_scalar()), "4xonetwothreefour");
781 changeme(lval_array_scalar);
782 is("@arr", "one two free");
784 # Tests for specific ops not tested above
786 @array2 = qw 'one two free';
787 is join(',', map $_, sub:lvalue{@array2}->()), 'one,two,free',
788 'rv2av in reference context';
789 is join(',', map $_, sub:lvalue{@{\@array2}}->()), 'one,two,free',
790 'rv2av-with-ref in reference context';
792 my %hash = qw[a b c d];
793 like join(',', map $_, sub:lvalue{%hash}->()),
794 qr/^(?:a,b,c,d|c,d,a,b)\z/, 'padhv in reference context';
796 %hash2 = qw[a b c d];
797 like join(',', map $_, sub:lvalue{%hash2}->()),
798 qr/^(?:a,b,c,d|c,d,a,b)\z/, 'rv2hv in reference context';
799 like join(',', map $_, sub:lvalue{%{\%hash2}}->()),
800 qr/^(?:a,b,c,d|c,d,a,b)\z/, 'rv2hv-with-ref in reference context';
805 sub AUTOLOAD :lvalue { *{$AUTOLOAD} };
807 my $foo = bless {},"Foo";
809 $foo->bar = sub { $result = "bar" };
811 is ($result, 'bar', "RT #41550");
814 SKIP: { skip 'no attributes.pm', 1 unless eval 'require attributes';
815 fresh_perl_is(<<'----', <<'====', {}, "lvalue can not be set after definition. [perl #68758]");
820 sub MODIFY_CODE_ATTRIBUTES {}
821 sub foo : lvalue : fr0g;
824 lvalue attribute ignored after the subroutine has been defined at - line 4.
825 lvalue attribute ignored after the subroutine has been defined at - line 6.
826 Can't modify non-lvalue subroutine call in scalar assignment at - line 7, near "3;"
827 Execution of - aborted due to compilation errors.
833 sub lval_decl : lvalue;
836 is($x, 5, "subroutine declared with lvalue before definition retains lvalue. [perl #68758]");
839 SKIP: { skip "no attributes.pm", 2 unless eval { require attributes };
840 sub utf8::valid :lvalue;
842 is "@{[ &attributes::get(\&utf8::valid) ]}", 'lvalue',
843 'sub declaration with :lvalue applies it to XSUBs';
845 BEGIN { *wonky = \&marjibberous }
847 is "@{[ &attributes::get(\&wonky) ]}", 'lvalue',
848 'sub declaration with :lvalue applies it to assigned stub';
851 sub fleen : lvalue { $pnare }
852 $pnare = __PACKAGE__;
853 ok eval { fleen = 1 }, "lvalues can return COWs (CATTLE?) [perl #75656]";\
854 is $pnare, 1, 'and returning CATTLE actually works';
855 $pnare = __PACKAGE__;
856 ok eval { (fleen) = 1 }, "lvalues can return COWs in list context";
857 is $pnare, 1, 'and returning COWs in list context actually works';
858 $pnare = __PACKAGE__;
859 ok eval { $_ = 1 for(fleen); 1 }, "lvalues can return COWs in ref cx";
860 is $pnare, 1, 'and returning COWs in reference context actually works';
863 # Returning an arbitrary expression, not necessarily lvalue
864 +sub :lvalue { return $ambaga || $ambaga }->() = 73;
865 is $ambaga, 73, 'explicit return of arbitrary expression (scalar context)';
866 (sub :lvalue { return $ambaga || $ambaga }->()) = 74;
867 is $ambaga, 74, 'explicit return of arbitrary expression (list context)';
868 +sub :lvalue { $ambaga || $ambaga }->() = 73;
869 is $ambaga, 73, 'implicit return of arbitrary expression (scalar context)';
870 (sub :lvalue { $ambaga || $ambaga }->()) = 74;
871 is $ambaga, 74, 'implicit return of arbitrary expression (list context)';
872 eval { +sub :lvalue { return 3 }->() = 4 };
873 like $@, qr/Can\'t return a readonly value from lvalue subroutine at/,
874 'assignment to numeric constant explicitly returned from lv sub';
875 eval { (sub :lvalue { return 3 }->()) = 4 };
876 like $@, qr/Can\'t return a readonly value from lvalue subroutine at/,
877 'assignment to num constant explicitly returned (list cx)';
878 eval { +sub :lvalue { 3 }->() = 4 };
879 like $@, qr/Can\'t return a readonly value from lvalue subroutine at/,
880 'assignment to numeric constant implicitly returned from lv sub';
881 eval { (sub :lvalue { 3 }->()) = 4 };
882 like $@, qr/Can\'t return a readonly value from lvalue subroutine at/,
883 'assignment to num constant implicitly returned (list cx)';
885 # reference (potential lvalue) context
887 for my $sub (sub :lvalue {$_}, sub :lvalue {return $_}) {
888 &$sub()->${\sub { $_[0] = 37 }};
889 is $_, '37', 'lvalue->method'.$suffix;
890 ${\scalar &$sub()} = 38;
891 is $_, '38', 'scalar(lvalue)'.$suffix;
892 sub assign39_with_proto ($) { $_[0] = 39 }
893 assign39_with_proto(&$sub());
894 is $_, '39', 'func(lvalue) when func has $ proto'.$suffix;
896 ${\(&$sub()||undef)} = 40;
897 is $_, '40', 'lvalue||...'.$suffix;
898 ${\(${\undef}||&$sub())} = 41; # extra ${\...} to bypass const folding
899 is $_, '41', '...||lvalue'.$suffix;
901 ${\(&$sub()&&undef)} = 42;
902 is $_, '42', 'lvalue&&...'.$suffix;
903 ${\(${\1}&&&$sub())} = 43;
904 is $_, '43', '...&&lvalue'.$suffix;
905 ${\(&$sub())[0]} = 44;
906 is $_, '44', '(lvalue)[0]'.$suffix;
908 continue { $suffix = ' (explicit return)' }
912 for my $sub (sub :lvalue {$_}, sub :lvalue {return $_}) {
915 is $_->[3], 4, 'func->[...] autovivification'.$suffix;
918 is $_->{3}, 4, 'func->{...} autovivification'.$suffix;
921 is $$_, 4, '${func()} autovivification' .$suffix;
924 is "@$_", 4, '@{func()} autovivification' .$suffix;
927 is join('-',%$_), '4-5', '%{func()} autovivification'.$suffix;
930 is $$_, 4, '${ (), func()} autovivification' .$suffix;
932 continue { $suffix = ' (explicit return)' }
934 # [perl #92406] [perl #92290] Returning a pad var in rvalue context
937 sub :lvalue { my $x = 72; $x },
938 sub :lvalue { my $x = 72; return $x }
940 is scalar(&$sub), 72, "sub returning pad var in scalar context$suffix";
941 is +(&$sub)[0], 72, "sub returning pad var in list context$suffix";
943 continue { $suffix = ' (explicit return)' }
945 # Returning read-only values in reference context
948 sub :lvalue { $] }->(),
949 sub :lvalue { return $] }->()
951 is \$_, \$], 'read-only values are returned in reference context'
952 .$suffix # (they used to be copied)
954 continue { $suffix = ' (explicit return)' }
956 # Returning unwritables from nested lvalue sub call in in rvalue context
957 # First, ensure we are testing what we think we are:
958 if (!Internals::SvREADONLY($])) { Internals::SvREADONLY($],1); }
959 sub squibble : lvalue { return $] }
960 sub squebble : lvalue { squibble }
961 sub squabble : lvalue { return squibble }
962 is $x = squebble, $], 'returning ro from nested lv sub call in rv cx';
963 is $x = squabble, $], 'explct. returning ro from nested lv sub in rv cx';
964 is \squebble, \$], 'returning ro from nested lv sub call in ref cx';
965 is \squabble, \$], 'explct. returning ro from nested lv sub in ref cx';
967 # [perl #102486] Sub calls as the last statement of an lvalue sub
971 sub strictlv :lvalue { use strict 'refs'; &$x }
972 sub lv :lvalue { &$x }
973 sub nonlv { ++$called }
975 ::like $@, qr/^Can't use string \("nonlv"\) as a subroutine ref while/,
976 'strict mode applies to sub:lvalue{ &$string }';
979 'sub:lvalue{&$x}->() does not die for non-lvalue inner sub call';
980 ::is $called, 1, 'The &$x actually called the sub';
981 eval { +sub :lvalue { &$x }->() = 3 };
982 ::like $@, qr/^Can't modify non-lvalue subroutine call at /,
983 'sub:lvalue{&$x}->() dies in true lvalue context';
986 # TARG should be copied in rvalue context
987 sub ucf :lvalue { ucfirst $_[0] }
988 is ucf("just another ") . ucf("perl hacker,\n"),
989 "Just another Perl hacker,\n", 'TARG is copied in rvalue scalar cx';
990 is join('',ucf("just another "), ucf "perl hacker,\n"),
991 "Just another Perl hacker,\n", 'TARG is copied in rvalue list cx';
993 @_ ? ucfirst $_[0] : do {
994 is ucfr("just another ") . ucfr("perl hacker,\n"),
995 "Just another Perl hacker,\n",
996 'TARG is copied in recursive rvalue scalar cx';
997 is join('',ucfr("just another "), ucfr("perl hacker,\n")),
998 "Just another Perl hacker,\n",
999 'TARG is copied in recursive rvalue list cx';
1004 # Test TARG with potential lvalue context, too
1005 for (sub : lvalue { "$x" }->()) {
1006 is \$_, \$_, '\$_ == \$_ in for(sub :lvalue{"$x"}->()){...}'
1009 # [perl #117947] XSUBs should not be treated as lvalues at run time
1010 eval { &{\&utf8::is_utf8}("") = 3 };
1011 like $@, qr/^Can't modify non-lvalue subroutine call at /,
1012 'XSUB not seen at compile time dies in lvalue context';
1014 # [perl #119797] else implicitly returning value
1015 # This used to cause Bizarre copy of ARRAY in pp_leave
1016 sub else119797 : lvalue {
1018 1; # two statements force a leave op
1025 eval { (else119797(0)) = 1..3 };
1026 is $@, "", '$@ after writing to array returned by else';
1027 is "@119797", "1 2 3", 'writing to array returned by else';
1028 eval { (else119797(1)) = 4..6 };
1029 is $@, "", '$@ after writing to array returned by if (with else)';
1030 is "@119797", "4 5 6", 'writing to array returned by if (with else)';
1031 sub if119797 : lvalue {
1037 eval { (if119797(1)) = 4..6 };
1038 is $@, "", '$@ after writing to array returned by if';
1039 is "@119797", "4 5 6", 'writing to array returned by if';
1040 sub unless119797 : lvalue {
1046 eval { (unless119797(0)) = 4..6 };
1047 is $@, "", '$@ after writing to array returned by unless';
1048 is "@119797", "4 5 6", 'writing to array returned by unless';
1049 sub bare119797 : lvalue {
1055 eval { (bare119797(0)) = 4..6 };
1056 is $@, "", '$@ after writing to array returned by bare block';
1057 is "@119797", "4 5 6", 'writing to array returned by bare block';