From: bors <bors@rust-lang.org>
Date: Tue, 6 Mar 2018 19:16:55 +0000 (+0000)
Subject: Auto merge of #5132 - Eh2406:less_clones, r=alexcrichton
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Auto merge of #5132 - Eh2406:less_clones, r=alexcrichton

don't clone a BacktrackFrame if we are not going to backtrack

I think this is a fix for #5130.

Currently the only recoverable `activate` error does not corrupt `cx`, so this is definitely ok. We should be careful as we add more recoverable `activate` errors that they don't corrupt `cx` to the point where the error messages are affected.
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c7219374061c514ecf40d918ba689ea36ee94fbd