4a8c10f58c
This is very half baked. Putting it down to work on better type literal support for the moment. Qs: (1) What should we measure? cast failures mapped back to source? I don't think we inject anything else right now. (2) How should we report? I just have dump function right now, but that'll be unwieldy on large apps. R=jacobr@google.com, jmesserly@google.com Review URL: https://chromereviews.googleplex.com/146737013