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* SI-9834 Improve error on failed op=Som Snytt2016-11-251-0/+6
If rewriting `x += y` fails to typecheck, emit error messages for both the original tree and the assignment. If rewrite is not attempted because `x` is a val, then say so. The error message at `tree.pos` is updated with the additional advice. SI-8763 Crash in update conversion When there are already errors, don't attempt mechanical rewrites.