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BEGIN {
chdir 't';
require './test.pl';
set_up_inc("../lib");
}
plan 42;
sub on { $::TODO = ' ' }
sub off{ $::TODO = '' }
eval '\$x = \$y';
like $@, qr/^Experimental lvalue references not enabled/,
'error when feature is disabled';
eval '\($x) = \$y';
like $@, qr/^Experimental lvalue references not enabled/,
'error when feature is disabled (aassign)';
use feature 'lvalue_refs';
{
my($w,$c);
local $SIG{__WARN__} = sub { $c++; $w = shift };
eval '\$x = \$y';
is $c, 1, 'one warning from lv ref assignment';
like $w, qr/^Lvalue references are experimental/,
'experimental warning';
undef $c;
eval '\($x) = \$y';
is $c, 1, 'one warning from lv ref list assignment';
like $w, qr/^Lvalue references are experimental/,
'experimental warning';
}
no warnings 'experimental::lvalue_refs';
# Scalars
eval '\$x = \$y';
is \$x, \$y, '\$pkg_scalar = ...';
my $m;
\$m = \$y;
is \$m, \$y, '\$lexical = ...';
\my $n = \$y;
is \$n, \$y, '\my $lexical = ...';
@_ = \$_;
\($x) = @_;
is \$x, \$_, '\($pkgvar) = ... gives list context';
undef *x;
(\$x) = @_;
is \$x, \$_, '(\$pkgvar) = ... gives list context';
on;
my $o;
eval '\($o) = @_';
is \$o, \$_, '\($lexical) = ... gives list cx';
my $q;
eval '(\$q) = @_';
is \$q, \$_, '(\$lexical) = ... gives list cx';
eval '\(my $p) = @_';
is \$p, \$_, '\(my $lexical) = ... gives list cx';
eval '(\my $r) = @_';
is \$r, \$_, '(\my $lexical) = ... gives list cx';
eval '\my($s) = @_';
is \$s, \$_, '\my($lexical) = ... gives list cx';
eval '\($_a, my $a) = @{[\$b, \$c]}';
is \$_a, \$b, 'package scalar in \(...)';
is \$a, \$c, 'lex scalar in \(...)';
eval '(\$_b, \my $b) = @{[\$b, \$c]}';
is \$_b, \$::b, 'package scalar in (\$foo, \$bar)';
is \$b, \$c, 'lex scalar in (\$foo, \$bar)';
is eval '\local $l = \3; $l', 3, '\local $scalar assignment';
off;
is $l, undef, 'localisation unwound';
\$foo = \*bar;
is *foo{SCALAR}, *bar{GLOB}, 'globref-to-scalarref assignment';
on;
# Array Elements
# ...
# Hash Elements
# ...
# Arrays
# ...
# Hashes
# ...
# Subroutines
# ...
# Mixed List Assignments
off;
(\$tahi, $rua) = \(1,2);
is join(' ', $tahi, $$rua), '1 2',
'mixed scalar ref and scalar list assignment';
on;
# Conditional expressions
$_ = 3;
eval '$_ == 3 ? \$tahi : $rua = \3';
is $tahi, 3, 'cond assignment resolving to scalar ref';
eval '$_ == 3 ? \$toru : $wha = \3';
is $$wha, 3, 'cond assignment resolving to scalar';
eval '$_ == 3 ? \$rima : \$ono = \5';
is $$rima, 5, 'cond assignment with refgens on both branches';
# Foreach
eval '
for \my $a(\$for1, \$for2) {
push @for, \$a;
}
';
is "@for", \$for1 . ' ' . \$for2, 'foreach \my $a';
@for = ();
eval '
for \my @a([1,2], [3,4]) {
push @for, @a;
}
';
is "@for", "1 2 3 4", 'foreach \my @a [perl #22335]';
@for = ();
eval '
for \my %a({5,6}, {7,8}) {
push @for, %a;
}
';
is "@for", "5 6 7 8", 'foreach \my %a [perl #22335]';
@for = ();
eval '
for \my &a(sub {9}, sub {10}) {
push @for, &a;
}
';
is "@for", "9 10", 'foreach \my &a';
# Errors
off;
eval { my $x; \$x = 3 };
like $@, qr/^Assigned value is not a reference at/, 'assigning non-ref';
eval { my $x; \$x = [] };
like $@, qr/^Assigned value is not a SCALAR reference at/,
'assigning non-scalar ref to scalar ref';
eval { \$::x = [] };
like $@, qr/^Assigned value is not a SCALAR reference at/,
'assigning non-scalar ref to package scalar ref';
on;
eval '(\do{}) = 42';
like $@, qr/^Can't modify reference to do block in list assignment at /,
"Can't modify reference to do block in list assignment";
off;
eval '(\pos) = 42';
like $@,
qr/^Can't modify reference to match position in list assignment at /,
"Can't modify ref to some scalar-returning op in list assignment";
on;
eval '(\glob) = 42';
like $@,
qr/^Can't modify reference to glob in list assignment at /,
"Can't modify reference to some list-returning op in list assignment";
off;
eval '\pos = 42';
like $@,
qr/^Can't modify reference to match position in scalar assignment at /,
"Can't modify ref to some scalar-returning op in scalar assignment";
on;
# Miscellaneous
{
my($x,$y);
sub {
sub {
\$x = \$y;
}->();
is \$x, \$y, 'lexical alias affects outer closure';
}->();
is \$x, \$y, 'lexical alias affects outer sub where vars are declared';
}
{ # PADSTALE has a double meaning
use feature 'lexical_subs', 'signatures', 'state';
no warnings 'experimental';
my $c;
my sub s ($arg) {
state $x = ++$c;
if ($arg == 3) { return $c }
goto skip if $arg == 2;
my $y;
skip:
# $y is PADSTALE the 2nd time
\$x = \$y if $arg == 2;
}
s(1);
s(2);
is s(3), 1, 'padstale alias should not reset state'
}
off;
SKIP: {
skip_without_dynamic_extension('List/Util');
require Scalar::Util;
my $a;
Scalar::Util::weaken($r = \$a);
\$a = $r;
pass 'no crash when assigning \$lex = $weakref_to_lex'
}
|
