Move top-level files to mod.rs when applicable

[BD103]

There are two modules in clippy_utils that are currently in the form of:

src/
  | ast_utils/
  | ty/
  |
  | ast_utils.rs
  | ty.rs

This PR moves the top-level modules to become mod.rs, within their respective folders.

src/
  | ast_utils/
  |   | mod.rs
  |
  | ty/
  |   | mod.rs

This reduces clutter in the src folder, and makes it easier to find related files in certain editors.¹ This also appears to be the standard used in other crates in this repository, though I looked very briefly.

I do realize that this is a style / opinionated change, so I'll close it if it receives much push-back. :)

changelog: none

• cargo test passes locally
• Run cargo dev fmt

Footnotes

1. I use VSCode, which groups all folders together and all files separately. This means that ty.rs is quite "far" away from the ty/ folder, which makes it move difficult to navigate between the two. ↩

[rustbot]

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[bors]

☔ The latest upstream changes (presumably ff4a26d) made this pull request unmergeable. Please resolve the merge conflicts.

[BD103]

I believe I fixed the merge conflicts with git pull --rebase upstream master, but let me know if I did something additional!

[llogiq]

Thank you. Sorry for taking so long.

[BD103]

Thank you. Sorry for taking so long.

No rush, I'm just glad to help out :)