Trait method and associated type auto completion removes comments and attributes

[vallentin]

When implementing a trait, I sometimes write comments and attributes before adding the actual method or associated type. I've encountered a bug, where if you use auto completion, then the comments and attribute prior are removed.

I can recall this issue having existed for a long time. So thought I might as well finally report it.

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Steps to reproduce

1. Create a trait, which has any amount of methods and/or associated types
2. Start implementing the trait for a type
3. Write comments and/or attributes
4. Start typing the name of a method or associated type
5. Press Enter to auto complete
6. Now the method/type has been auto completed, while the previous comments and/or attributes have been removed

Example

I think a code snippet is less sufficient in this case, so I'll include screenshots.

• Before shows the comments and attributes, with the auto complete prompt open
• After is after having pressed Enter enter on the auto complete suggestion

Before	After

Before	After

It also happens for associated types.

Before	After

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rust-analyzer version: 6175353 2021-04-26 stable