std: override clone_from for Vec. #13280
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A vector can reuse its allocation (and the allocations/resources of any contained values) when cloning into an already-instantiated vector, so we might as well do so.
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Add RequestFailed error code, as per spec 3.17 See microsoft/language-server-protocol#1341
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std: override clone_from for Vec.
A vector can reuse its allocation (and the allocations/resources of any
contained values) when cloning into an already-instantiated vector, so
we might as well do so.