Better support for mocking methods like std::io::Read::read #651
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std::io::Read::read is often called with an uninitialized buffer as its argument. So Mockall shouldn't try to read from that buffer, even though the language rules allow it to. Previously, Mockall would try to read from it, in order to format a panic message in case no matching Expectation was found.
Now, Mockall will not try to format such a panic message preemptively. It will only do it if there actually isn't any matching Expectation. That also provides a small performance boost to all users.
Also, do a better job of clearing poison from static methods' Mutexes following a panic. Previously we would only do that if the user had created a Context object. Now we will do it regardless.
Fixes #647