Error from installing Moose locally

Question

I was able to run the following code on my local machine where I have a power of sudo"

#!/usr/bin/env perl

package Cat
{
    use Moose;
    has 'name', is => 'ro', isa => 'Str';

}

my $test_obj = Cat->new(name => "kitty");

print $test_obj->name()."\n";

result :

$perl Cat.pl
kitty

But when I ran the exact same code in other machines where I do not have sudo, I get the following error:

syntax error at Cat.pl line 5, near "{
    "
Execution of Cat.pl aborted due to compilation errors.

Why does this happen?

I installed the Module using cpanm on all of my three machines, one with sudo and the two without sudo(I installed them locally). The versions of perl are :

machine 1(worked, has sudo) : (v5.14.2) built for cygwin-thread-multi-64int
machine 2(did not work, no sudo previlage) : perl, v5.10.1 (*) built for x86_64-linux-thread-multi
machine 3(did not work, no sudo previlage) : v5.10.0 built for x86_64-linux-thread-multi

So it seems like it has to do with shared library or something, but I cannot figure out exactly why it doesn't work on the two machines. Is this a known issue?

Answer 1

The package { ... } syntax you're trying to use was added in perl 5.14.0 (released in May 2011).

If you want to run on perl 5.12 and older, change your code to look like:

{
    package Cat;
    use Moose;
    has 'name' => (...);
    # etc.
}

my $test_obj = Cat->new(...);
# etc.

The package declaration won't leak outside of the braces, so the code at the bottom will be running in package main, and my or our variables will stay inside of the block as well.