Make clippy less noisy when asserting in const fn context

[StackOverflowExcept1on]

Description

This code gets 2 warnings:

1. constant is not used even if it is actually used in the const assert!()
2. clippy found that the assertion is always true and can be optimized, although this code can be used as a replacement for static_assertions (which has not been updated for 4 years)

const X: usize = 5;

#[allow(dead_code, clippy::assertions_on_constants)]
const _: () = assert!(X % 5 == 0);
// ^ equivalent of static_assertions

Version

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Additional Labels

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[Jarcho]

dead_code is a rustc lint. The second part is fixed by #11966.

[StackOverflowExcept1on]

Ok, I'll reopen issue in rust-lang/rust repo when clippy will be synced

[y21]

That dead_code one looks like rust-lang/rust#118424