Niko Matsakis 4379b13c9d Make type inference smarter, based on the idea that all constraints must
have the same type; so if we see errors or cases where we cannot infer a
type, let's just take it from one of the successful alternatives. This
lets us remote the type annotation on `E` (or `T`, depending).
2015-06-22 14:14:03 -04:00
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