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use strict;
use warnings;
...
}

1;

Global symbol "$bar" requires explicit package name at Foo.pm line 6.
Global symbol "$bar" requires explicit package name at Foo.pm line 9.
Global symbol "$bar" requires explicit package name at Foo.pm line 10.
Foo.pm had compilation errors.

use strict;
...
}

1;

use strict;
use warnings;
...

Foo::init();
print $Foo::bar;

Name "Foo::bar" used only once: possible typo at math1.pl line 7.
Use of uninitialized value in print at math1.pl line 7.