+{
+ no strict 'refs';
+ $name8 = chr 163;
+ $name_utf8 = $name8 . chr 256;
+ chop $name_utf8;
+
+ is ($$name8, undef, 'Nothing before we start');
+ is ($$name_utf8, undef, 'Nothing before we start');
+ $$name8 = "Pound";
+ is ($$name8, "Pound", 'Accessing via 8 bit symref works');
+ is ($$name_utf8, "Pound", 'Accessing via UTF8 symref works');
+}
+
+{
+ no strict 'refs';
+ $name_utf8 = $name = chr 9787;
+ utf8::encode $name_utf8;
+
+ is (length $name, 1, "Name is 1 char");
+ is (length $name_utf8, 3, "UTF8 representation is 3 chars");
+
+ is ($$name, undef, 'Nothing before we start');
+ is ($$name_utf8, undef, 'Nothing before we start');
+ $$name = "Face";
+ is ($$name, "Face", 'Accessing via Unicode symref works');
+ is ($$name_utf8, undef,
+ 'Accessing via the UTF8 byte sequence gives nothing');
+}
+
+{
+ no strict 'refs';
+ $name1 = "\0Chalk";
+ $name2 = "\0Cheese";
+
+ isnt ($name1, $name2, "They differ");
+
+ is ($$name1, undef, 'Nothing before we start (scalars)');
+ is ($$name2, undef, 'Nothing before we start');
+ $$name1 = "Yummy";
+ is ($$name1, "Yummy", 'Accessing via the correct name works');
+ is ($$name2, undef,
+ 'Accessing via a different NUL-containing name gives nothing');
+ # defined uses a different code path
+ ok (defined $$name1, 'defined via the correct name works');
+ ok (!defined $$name2,
+ 'defined via a different NUL-containing name gives nothing');
+
+ is ($name1->[0], undef, 'Nothing before we start (arrays)');
+ is ($name2->[0], undef, 'Nothing before we start');
+ $name1->[0] = "Yummy";
+ is ($name1->[0], "Yummy", 'Accessing via the correct name works');
+ is ($name2->[0], undef,
+ 'Accessing via a different NUL-containing name gives nothing');
+ ok (defined $name1->[0], 'defined via the correct name works');
+ ok (!defined$name2->[0],
+ 'defined via a different NUL-containing name gives nothing');
+
+ my (undef, $one) = @{$name1}[2,3];
+ my (undef, $two) = @{$name2}[2,3];
+ is ($one, undef, 'Nothing before we start (array slices)');
+ is ($two, undef, 'Nothing before we start');
+ @{$name1}[2,3] = ("Very", "Yummy");
+ (undef, $one) = @{$name1}[2,3];
+ (undef, $two) = @{$name2}[2,3];
+ is ($one, "Yummy", 'Accessing via the correct name works');
+ is ($two, undef,
+ 'Accessing via a different NUL-containing name gives nothing');
+ ok (defined $one, 'defined via the correct name works');
+ ok (!defined $two,
+ 'defined via a different NUL-containing name gives nothing');
+
+ is ($name1->{PWOF}, undef, 'Nothing before we start (hashes)');
+ is ($name2->{PWOF}, undef, 'Nothing before we start');
+ $name1->{PWOF} = "Yummy";
+ is ($name1->{PWOF}, "Yummy", 'Accessing via the correct name works');
+ is ($name2->{PWOF}, undef,
+ 'Accessing via a different NUL-containing name gives nothing');
+ ok (defined $name1->{PWOF}, 'defined via the correct name works');
+ ok (!defined $name2->{PWOF},
+ 'defined via a different NUL-containing name gives nothing');
+
+ my (undef, $one) = @{$name1}{'SNIF', 'BEEYOOP'};
+ my (undef, $two) = @{$name2}{'SNIF', 'BEEYOOP'};
+ is ($one, undef, 'Nothing before we start (hash slices)');
+ is ($two, undef, 'Nothing before we start');
+ @{$name1}{'SNIF', 'BEEYOOP'} = ("Very", "Yummy");
+ (undef, $one) = @{$name1}{'SNIF', 'BEEYOOP'};
+ (undef, $two) = @{$name2}{'SNIF', 'BEEYOOP'};
+ is ($one, "Yummy", 'Accessing via the correct name works');
+ is ($two, undef,
+ 'Accessing via a different NUL-containing name gives nothing');
+ ok (defined $one, 'defined via the correct name works');
+ ok (!defined $two,
+ 'defined via a different NUL-containing name gives nothing');
+
+ $name1 = "Left"; $name2 = "Left\0Right";
+ my $glob2 = *{$name2};
+
+ is ($glob1, undef, "We get different typeglobs. In fact, undef");
+
+ *{$name1} = sub {"One"};
+ *{$name2} = sub {"Two"};
+
+ is (&{$name1}, "One");
+ is (&{$name2}, "Two");
+}
+
+# test derefs after list slice
+
+is ( ({foo => "bar"})[0]{foo}, "bar", 'hash deref from list slice w/o ->' );
+is ( ({foo => "bar"})[0]->{foo}, "bar", 'hash deref from list slice w/ ->' );
+is ( ([qw/foo bar/])[0][1], "bar", 'array deref from list slice w/o ->' );
+is ( ([qw/foo bar/])[0]->[1], "bar", 'array deref from list slice w/ ->' );
+is ( (sub {"bar"})[0](), "bar", 'code deref from list slice w/o ->' );
+is ( (sub {"bar"})[0]->(), "bar", 'code deref from list slice w/ ->' );
+
+# deref on empty list shouldn't autovivify
+{
+ local $@;
+ eval { ()[0]{foo} };
+ like ( "$@", qr/Can't use an undefined value as a HASH reference/,
+ "deref of undef from list slice fails" );
+}
+
+# test dereferencing errors
+{
+ format STDERR =
+.
+ my $ref;
+ foreach $ref (*STDOUT{IO}, *STDERR{FORMAT}) {
+ eval q/ $$ref /;
+ like($@, qr/Not a SCALAR reference/, "Scalar dereference");
+ eval q/ @$ref /;
+ like($@, qr/Not an ARRAY reference/, "Array dereference");
+ eval q/ %$ref /;
+ like($@, qr/Not a HASH reference/, "Hash dereference");
+ eval q/ &$ref /;
+ like($@, qr/Not a CODE reference/, "Code dereference");
+ }
+
+ $ref = *STDERR{FORMAT};
+ eval q/ *$ref /;
+ like($@, qr/Not a GLOB reference/, "Glob dereference");
+
+ $ref = *STDOUT{IO};
+ eval q/ *$ref /;
+ is($@, '', "Glob dereference of PVIO is acceptable");
+
+ is($ref, *{$ref}{IO}, "IO slot of the temporary glob is set correctly");
+}
+
+# these will segfault if they fail
+
+my $pvbm = PVBM;
+my $rpvbm = \$pvbm;
+
+ok (!eval { *$rpvbm }, 'PVBM ref is not a GLOB ref');
+ok (!eval { *$pvbm }, 'PVBM is not a GLOB ref');
+ok (!eval { $$pvbm }, 'PVBM is not a SCALAR ref');
+ok (!eval { @$pvbm }, 'PVBM is not an ARRAY ref');
+ok (!eval { %$pvbm }, 'PVBM is not a HASH ref');
+ok (!eval { $pvbm->() }, 'PVBM is not a CODE ref');
+ok (!eval { $rpvbm->foo }, 'PVBM is not an object');
+
+# bug 24254
+is( runperl(stderr => 1, prog => 'map eval qq(exit),1 for 1'), "");
+is( runperl(stderr => 1, prog => 'eval { for (1) { map { die } 2 } };'), "");
+is( runperl(stderr => 1, prog => 'for (125) { map { exit } (213)}'), "");
+my $hushed = $^O eq 'VMS' ? 'use vmsish qw(hushed);' : '';
+is( runperl(stderr => 1, prog => $hushed . 'map die,4 for 3'), "Died at -e line 1.\n");
+is( runperl(stderr => 1, prog => $hushed . 'grep die,4 for 3'), "Died at -e line 1.\n");
+is( runperl(stderr => 1, prog => $hushed . 'for $a (3) {@b=sort {die} 4,5}'), "Died at -e line 1.\n");
+
+# bug 57564
+is( runperl(stderr => 1, prog => 'my $i;for $i (1) { for $i (2) { } }'), "");
+
+# The mechanism for freeing objects in globs used to leave dangling
+# pointers to freed SVs. To test this, we construct this nested structure:
+# GV => blessed(AV) => RV => GV => blessed(SV)
+# all with a refcnt of 1, and hope that the second GV gets processed first
+# by do_clean_named_objs. Then when the first GV is processed, it mustn't
+# find anything nasty left by the previous GV processing.
+# The eval is stop things in the main body of the code holding a reference
+# to a GV, and the print at the end seems to bee necessary to ensure
+# the correct freeing order of *x and *y (no, I don't know why - DAPM).
+
+is (runperl(
+ prog => 'eval q[bless \@y; bless \$x; $y[0] = \*x; $z = \*y; ]; '
+ . 'delete $::{x}; delete $::{y}; print qq{ok\n};',
+ stderr => 1),
+ "ok\n", 'freeing freed glob in global destruction');
+
+
+# Test undefined hash references as arguments to %{} in boolean context
+# [perl #81750]
+{
+ no strict 'refs';
+ eval { my $foo; %$foo; }; ok !$@, '%$undef';
+ eval { my $foo; scalar %$foo; }; ok !$@, 'scalar %$undef';
+ eval { my $foo; !%$foo; }; ok !$@, '!%$undef';
+ eval { my $foo; if ( %$foo) {} }; ok !$@, 'if ( %$undef) {}';
+ eval { my $foo; if (!%$foo) {} }; ok !$@, 'if (!%$undef) {}';
+ eval { my $foo; unless ( %$foo) {} }; ok !$@, 'unless ( %$undef) {}';
+ eval { my $foo; unless (!%$foo) {} }; ok !$@, 'unless (!%$undef) {}';
+ eval { my $foo; 1 if %$foo; }; ok !$@, '1 if %$undef';
+ eval { my $foo; 1 if !%$foo; }; ok !$@, '1 if !%$undef';
+ eval { my $foo; 1 unless %$foo; }; ok !$@, '1 unless %$undef;';
+ eval { my $foo; 1 unless ! %$foo; }; ok !$@, '1 unless ! %$undef';
+ eval { my $foo; %$foo ? 1 : 0; }; ok !$@, ' %$undef ? 1 : 0';
+ eval { my $foo; !%$foo ? 1 : 0; }; ok !$@, '!%$undef ? 1 : 0';
+}
+
+# RT #88330
+# Make sure that a leaked thinggy with multiple weak references to
+# it doesn't trigger a panic with multiple rounds of global cleanup
+# (Perl_sv_clean_all).
+
+SKIP: {
+ skip_if_miniperl('no Scalar::Util under miniperl', 4);
+
+ local $ENV{PERL_DESTRUCT_LEVEL} = 2;
+
+ # we do all permutations of array/hash, 1ref/2ref, to account
+ # for the different way backref magic is stored
+
+ fresh_perl_is(<<'EOF', 'ok', { stderr => 1 }, 'array with 1 weak ref');
+use Scalar::Util qw(weaken);
+my $r = [];
+Internals::SvREFCNT(@$r, 9);
+my $r1 = $r;
+weaken($r1);
+print "ok";
+EOF
+
+ fresh_perl_is(<<'EOF', 'ok', { stderr => 1 }, 'array with 2 weak refs');
+use Scalar::Util qw(weaken);
+my $r = [];
+Internals::SvREFCNT(@$r, 9);
+my $r1 = $r;
+weaken($r1);
+my $r2 = $r;
+weaken($r2);
+print "ok";
+EOF
+
+ fresh_perl_is(<<'EOF', 'ok', { stderr => 1 }, 'hash with 1 weak ref');
+use Scalar::Util qw(weaken);
+my $r = {};
+Internals::SvREFCNT(%$r, 9);
+my $r1 = $r;
+weaken($r1);
+print "ok";
+EOF
+
+ fresh_perl_is(<<'EOF', 'ok', { stderr => 1 }, 'hash with 2 weak refs');
+use Scalar::Util qw(weaken);
+my $r = {};
+Internals::SvREFCNT(%$r, 9);
+my $r1 = $r;
+weaken($r1);
+my $r2 = $r;
+weaken($r2);
+print "ok";
+EOF
+
+}
+
+SKIP:{
+ skip_if_miniperl "no Scalar::Util on miniperl", 1;
+ my $error;
+ *hassgropper::DESTROY = sub {
+ require Scalar::Util;
+ eval { Scalar::Util::weaken($_[0]) };
+ $error = $@;
+ # This line caused a crash before weaken refused to weaken a
+ # read-only reference:
+ $do::not::overwrite::this = $_[0];
+ };
+ my $xs = bless [], "hassgropper";
+ undef $xs;
+ like $error, qr/^Modification of a read-only/,
+ 'weaken refuses to weaken a read-only ref';
+ # Now that the test has passed, avoid sabotaging global destruction:
+ undef *hassgropper::DESTROY;
+ undef $do::not::overwrite::this;
+}
+
+
+is ref( bless {}, "nul\0clean" ), "nul\0clean", "ref() is nul-clean";
+
+# Test constants and references thereto.
+for (3) {
+ eval { $_ = 4 };
+ like $@, qr/^Modification of a read-only/,
+ 'assignment to value aliased to literal number';
+ require Config;
+ eval { ${\$_} = 4 };
+ like $@, qr/^Modification of a read-only/,
+ 'refgen does not allow assignment to value aliased to literal number';
+}
+for ("4eounthouonth") {
+ eval { $_ = 4 };
+ like $@, qr/^Modification of a read-only/,
+ 'assignment to value aliased to literal string';
+ require Config;
+ eval { ${\$_} = 4 };
+ like $@, qr/^Modification of a read-only/,
+ 'refgen does not allow assignment to value aliased to literal string';
+}
+{
+ my $aref = \123;
+ is \$$aref, $aref,
+ '[perl #109746] referential identity of \literal under threads+mad'
+}
+
+# Bit of a hack to make test.pl happy. There are 3 more tests after it leaves.
+$test = curr_test();
+curr_test($test + 3);