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# OddEffectOfImportTest.pm v1
package OddEffectOfImportTest;
...
@EXPORT = qw($OddEffectOfImportTest);
our $OddEffectOfImportTest = 6.28;
1;

#!/usr/bin/perl
# OddEffectOfImportTest v1
use strict;
use OddEffectOfImportTest;
print "$OddEffectOfImportTest\n";

#!/usr/bin/perl
# OddEffectOfImportTest v2
use strict;
use OddEffectOfImportTest goreallyfast => 1;
print "$OddEffectOfImportTest\n";

# OddEffectOfImportTest.pm v2
package OddEffectOfImportTest;
...

sub import {}
1;

Global symbol "$OddEffectOfImportTest" requires explicit package name 
+at ./OddEffectOfImportTest line 5.
Execution of ./OddEffectOfImportTest aborted due to compilation errors
+.