a3892f0ed9
feat: Implement extern crate completion Hi, this is a draft PR for #13002. I have basic completion working as well as a filter for existing extern crate imports in the same file. This is based on the tests, I have not actually tried this in an editor. Before going further I think this is a good point to stop and get feedback on the structure and approach I have taken so far. Let me know what you think :) I will make sure to add more tests, rebase commits and align with the code style guidelines before submitting a final version. A few specific questions : 1. Is there a better way to check for matching suggestions? right now I just test if an extern crate name starts with the current user input. 2. Am I creating the `CompletionItem` correctly? I noticed that `use_.rs` invokes a builder where as I do not. 3. When checking for existing extern crate imports the current implementation only looks at the current source file, is that sufficient?
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