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$ cat MyClass.pm

use strict;
use warnings;
...
};

1;

$ cat script.pl

use lib '.';
use MyClass;
...
$bar = foo;

print "$bar\n";

$ perl script.pl

42

$ cat MyClass2.pm

use strict;
use warnings;
...
};

1;

$ cat script2.pl

use lib '.';
use MyClass2;
...
$bar = foo;

print "$bar\n";

$ perl script2.pl

Global symbol "$bar" requires explicit package name (did you forget to
+ declare "my $bar"?) at script2.pl line 4.
Global symbol "$bar" requires explicit package name (did you forget to
+ declare "my $bar"?) at script2.pl line 6.
Execution of script2.pl aborted due to compilation errors.