I've seen this code in the wild: 
ok +Some::Package::Foo->a_method_call($var), 'test succeeded';

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I'm told that the plus gives the perl interpreter a hint about the sub called 'ok' that it's not a method in Some::Package::Foo.

Why is that desirable?

Is this syntax documented anywhere?

In reply to What does a plus mean before a package name? by will_

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