1.98 beta regression: "queries overflow the depth limit!"

[theemathas]

This regression was found by the 1.98 beta crater run.

[INFO] [stdout] error: queries overflow the depth limit!
[INFO] [stdout]   |
[INFO] [stdout]   = help: consider increasing the recursion limit by adding a `#![recursion_limit = "256"]` attribute to your crate (`alloy_signer_aws`)
[INFO] [stdout]   = note: query depth increased by 130 when computing layout of `{async block@/opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/alloy-signer-aws-0.11.1/src/signer.rs:116:5: 116:23}`

This affects dependents of old versions of alloy-signer-aws:

• (alloy-signer-aws-0.11.1) https://crater-reports.s3.amazonaws.com/beta-1.98-4/1.98.0-beta.1/gh/beeb.repro-alloy-ws/log.txt
• (alloy-signer-aws-0.11.0) https://crater-reports.s3.amazonaws.com/beta-1.98-4/1.98.0-beta.1/gh/Louis-Amas.anvil-rust-benchmarks/log.txt
• (alloy-signer-aws-0.11.0) https://crater-reports.s3.amazonaws.com/beta-1.98-4/1.98.0-beta.1/gh/audityourcontracts.seaport-call/log.txt
• (alloy-signer-aws-0.5.4) https://crater-reports.s3.amazonaws.com/beta-1.98-4/1.98.0-beta.1/gh/chen4903.coordinate/log.txt

[chenyukang]

I bisec find this PR is related:
#145477

[chenyukang]

A mcve:

macro_rules! nested_async {
    () => {
        async {}
    };
    ($_head:tt $($tail:tt)*) => {
        async { nested_async!($($tail)*).await }
    };
}

fn main() {
    let _ = nested_async!(
        x x x x x x x x x x x x x x x x
        x x x x x x x x x x x x x x x x
    );
}

https://play.rust-lang.org/?version=beta&mode=debug&edition=2024&gist=acbcaeda9b123ffc026284ec900c67d1

[theemathas]

cc @cjgillot, @oli-obk