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$ cat Foo.pm
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package Foo;
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use warnings::register;
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sub bar { warnings::warnif("Test"); }
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1;
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sub bar {
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   warnings::warnif("Test");
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}
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$ perl -e'use warnings; use Foo; Foo::bar();'
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Test at -e line 1
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$ perl -e'use Foo; use warnings; Foo::bar();'
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Test at -e line 1