8345: Add pub mod option for UnlinkedFile r=rainy-me a=rainy-me close #8228 This is a draft that changes `Diagnostic` to contain multiple fixes. Pre analysis is in https://github.com/rust-analyzer/rust-analyzer/issues/8228#issuecomment-812887085 Because this solution is straightforward so I decided to type it out for discussion. Currently the `check_fix` is not able to test the situation when multiple fixes available. <del>Also because `Insert 'mod x;'` and `Insert 'pub mod x;'` are so similar, I don't know how to test them correctly and want some suggestions.</del>. I added `check_fixes` to allow checking mutiple possible fixes. In additional, instead of append after possible existing `mod y`, I think it's possible to Insert `pub mod x;` after `pub mod y`. Should I implement this too? Co-authored-by: rainy-me <github@rainy.me>
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