Restriction lint for `/*` comments

What it does

This allow-by-default restriction lint detects any use of /* comments instead of // comments. This helps with codebases trying to maintain a uniform comment style, as well as codebases wanting to avoid the possibility of mid-line comments (with further code to the right of them).

Note: while in simple cases it might be easy to provide a rustfix suggestion, this lint has value even if it doesn't offer a suggestion. In complex cases I can easily imagine that providing a suggestion would require non-trivial changes.

Lint Name

slash_star_comment

Category

restriction

Advantage

• Helps enforce uniform comment style.
• Avoids mid-line comments (code /* comment */ more code).
• Reduces visual noise

Drawbacks

This is an intentionally opinionated restriction lint; it should remain allow-by-default, and should only be enabled by users wanting to check for it.

Example

code(); /* comment */

Could be written as:

code(); // comment

The issue names no files, tests, or entry points. Start by locating Clippy's restriction-lint implementation and existing lint tests, using the slash_star_comment examples as acceptance criteria. Done means the allow-by-default lint detects /* comments and does not require a rustfix suggestion.