Add a count parameter to the expect attribute

[JarredAllen]

This RFC proposes extending the expect attribute` from #2383

Rendered

[xFrednet]

Hey and thank you for the RFC! Currently, there is a discussion in the tracking issue rust-lang/rust#54503 and on Zulip what lint emission should actually be suppressed and fulfill the lint expectation. I would recommend putting this RFC on hold, until a decision was made in that regard.

[teor2345]

expect(lint, count = 0) seems like it should be the same as deny(lint).

[oskgo]

Agreed. I could see count = 0 being convenient for a tool that decreases the expected count when it is too high. Such a tool would then not have to deal with this edge case.

In my mind expect(lint, count = 0) should compile with a warning (or clippy lint) suggesting using deny instead.

[JarredAllen]

Hey and thank you for the RFC! Currently, there is a discussion in the tracking issue rust-lang/rust#54503 and on Zulip what lint emission should actually be suppressed and fulfill the lint expectation. I would recommend putting this RFC on hold, until a decision was made in that regard.

The decision has been reached and the attribute has been stabilized, so can we un-hold this RFC? I'd still love to see this feature happen.