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#!./perl
use strict;
use warnings;
use Scalar::Util qw(readonly);
use Test::More tests => 11;
ok( readonly(1), 'number constant');
my $var = 2;
ok( !readonly($var), 'number variable');
is( $var, 2, 'no change to number variable');
ok( readonly("fred"), 'string constant');
$var = "fred";
ok( !readonly($var), 'string variable');
is( $var, 'fred', 'no change to string variable');
$var = \2;
ok( !readonly($var), 'reference to constant');
ok( readonly($$var), 'de-reference to constant');
ok( !readonly(*STDOUT), 'glob');
sub try
{
my $v = \$_[0];
return readonly $$v;
}
$var = 123;
{
# This used not to work with ithreads, but seems to be working since 5.19.3
local $TODO = ( $Config::Config{useithreads} && $] < 5.019003 ) ?
"doesn't work with threads" : undef;
ok( try ("abc"), 'reference a constant in a sub');
}
ok( !try ($var), 'reference a non-constant in a sub');
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