Lint suggestion: require self for relative use statement paths

[noamraph]

What it does

Require self before paths in use statements that are relative to self.

Advantage

I found out that I'd want to easily distinguish between imports of my code and imports from other crates, and currently I can't easily distinguish between them.

A possible solution is to require adding self before relative imports. This makes it easy to distinguish between the two kinds, since local imports will always start with self, crate or super.

This would also make it easier to organize the imports according to their kind, like what the unstable rust-fmt option group_imports = StdExternalCrate does.

I don't suggest to enable this lint by default.

Drawbacks

I don't think of drawbacks, but I won't be surpried if others would think of some...

Example

use my_module::my_function;

Could be written as:

use self::my_module::my_function;

Note

If this is approved, I'd be happy to try to implement this.