I'm not sure I understand. Perl can indeed check variable names at compile time, even if they're fully qualified. Create a file called Foo.pm:
package Foo;
use vars qw( $foo );
$foo = 1;
Use it within a test program like so:
#!/usr/bin/perl -w
use strict;
use Foo;
print "$Foo::foo\n";
print "$Foo::fooo\n";
This gives me:
Name "Foo::fooo" used only once: possible typo at usefoo.pl line 7.
1
Use of uninitialized value in concatenation (.) or string at usefoo.pl
+ line 7.
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