Update libcollections tests to pass the new type rules. They used to return a pointer to the value they were modifying, but this should not have been legal, since that pointer would have to outlive the closure, and the closure continues to modify the value during the execution. This return value was just passed to `black_box` so as to convince llvm that the value was live, so rather than returning a pointer, modify to just call `black_box` directly inside the fn.

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