[PATCH] D56723: [CodeComplete] Propagate preferred types through parser in more cases

[Richard Smith - zygoloid via Phabricator via cfe-commits]

rsmith added a comment.

In D56723#1366529 <https://reviews.llvm.org/D56723#1366529>, @ilya-biryukov wrote:

> I'll try playing around with your idea, my initial plan is to store preferred type alongside the current token as a member of the `Parser` class and update it when advancing to next token, when the parser backtracks and in the places where we care about propagating the types.


`ConsumeToken` is a fairly hot function; if you can avoid changes there that'd be preferable. Tracking this automatically across tentative parse / rollback seems like a very nice idea.


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