Make it easier to find out how to silence clippy

[ChrisJefferson]

I often find I want to silence some clippy warning (for example, clippy has just warned me about assert!(!(d<d)), which is reasonable, except it's in a test and I really do want to check it).

While it might add more noise, I wonder if the 'help' line could be extended to say how to silence the warning, for example (I've added to the end)

warning: equal expressions as operands to `<`
   --> src/datastructures/digraph.rs:174:18
    |
174 |         assert!(!(d < d));
    |                  ^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#eq_op ,
       or silence this warning by adding #[allow(clippy::eq_op)] to the function

Or, this information could be added to https://rust-lang.github.io/rust-clippy/master/index.html#eq_op .

At the moment, (because I have a bad memory and don't do it often), every time I want to silence a clippy warning I have to google for it.

[flip1995]

Allowing Clippy lints works just like allowing rustc lints, with #[allow(clippy::lint_name)]. This is explicitly explained in the readme of Clippy. I don't really see how adding this to every warning would improve the situation. IMO, it would only clump up the message.

[ChrisJefferson]

After rethinking, I agree about not putting it into the lint message, but maybe the linked website -- or the website could have at least have an obvious link to the manual (is the current manual just the github readme?)

[flip1995]

Yeah, currently it's just the GitHub readme. We plan to write a Clippy Book. I'll leave this issue open, so we'll remember to include this.

[ThibsG]

Related issue: #6011