Whether init sets the variable explicitely or not has no bearing on the answer.
Foo.pm
------
use strict;
use warnings;
sub init {
print("Setting \$Foo::bar to 42.\n");
$Foo::bar = 42;
}
local $Foo::bar;
init();
1;
main.pl
-------
use strict;
use warnings;
use Foo ();
print("\$Foo::bar = $Foo::bar\n");
output
------
Setting $Foo::bar to 42.
Use of uninitialized value in concatenation (.) or string at main.pl l
+ine 7.
$Foo::bar =
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