Where is the implementation of macro `allow`?

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1 
    #[allow(clippy::too_many_arguments)]
    async fn set<'a>(&'a self, key: K, value: V, ttl: NonZeroU64) -> anyhow::Result<()> {
        let ttl = Duration::from_millis(ttl.get());
        self.data.write().unwrap().insert(key, value, ttl);
        Ok(())
    }

As above code shown, allow is a macro to ignore some clippy warning, I tried to find its implementation by rust-analyzer but failed with message no definition found for allow.

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It's not a macro. It's a built-in compiler attribute, and it's analyzed by the linter passes.

Most attributes are just that, metadata attached to code. Some atributes may be macros, but most aren't, particularly the built-in ones. If you really want to understand in detail how they work, you should read the source of the compiler, but that shouldn't be necessary.

3

Attributes can be classified into the following kinds:

— from https://doc.rust-lang.org/reference/attributes.html

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