fix #2377 super::super::*

[JoshMcguigan]

Thanks @matklad for the detailed explanation on #2377. I believe this fixes it.

One thing I'm not sure about is you said the fix would involve changing crates/ra_hir_def/src/path/lower/lower.rs, but I only changed crates/ra_hir_def/src/path/lower/lower_use.rs. I'm not sure what kind of test code I'd have to write to expose the issue in lower.rs, but I'd be happy to add it if you are able to provide additional guidance.

closes #2377

[JoshMcguigan]

I just added a test to crates/ra_ide/src/completion/complete_dot.rs to ensure this completion works, and it does not. So this PR should be considered WIP for now.

I'm going to dig into why this completion would still not be working, but I'm open to any guidance.

[JoshMcguigan]

See my latest commit for the change to crates/ra_hir_def/src/path/lower/lower.rs which seems to solve the actual completion bug. I believe this PR is now ready for review.

[flodiebold]

LGTM, thanks!

bors r+

[bors]

Build succeeded

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