278bf351e3
4065: Complete unqualified enum names in patterns and expressions r=matklad a=nathanwhit This PR implements the completion described in #4014. The result looks like so for patterns: <img width="542" alt="Screen Shot 2020-04-20 at 3 53 55 PM" src="https://user-images.githubusercontent.com/17734409/79794010-8f529400-831f-11ea-9673-f838aa9bc962.png"> and for `expr`s: <img width="620" alt="Screen Shot 2020-04-21 at 3 51 24 PM" src="https://user-images.githubusercontent.com/17734409/79908784-d73ded80-83e9-11ea-991d-921f0cb27e6f.png"> I'm not confident that the completion text itself is very robust, as it will unconditionally add completions for enum variants with the form `Enum::Variant`. This means (I believe) it would still suggest `Enum::Variant` even if the local name is changed i.e. `use Enum as Foo` or the variants are brought into scope such as through `use Enum::*`. Co-authored-by: nathanwhit <nathan.whitaker01@gmail.com>
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