#[sqlx::test] imported with #[macro_use] causes a stack overflow in rustc

[moubctez]

My minimal setup:

cargo new --lib --vcs none testsqlx
cd testsqlx
cargo add sqlx -Fruntime-tokio-native-tls

Contents of src/lib.rs

#[macro_use]
extern crate sqlx;

#[cfg(test)]
mod tests {
    #[test]
    fn test() {}
}

Then

cargo test --lib

Ends with

thread 'rustc' has overflowed its stack
fatal runtime error: stack overflow
error: could not compile `testsqlx`

This is Rust 1.62.1. It fails on both macOS and FreeBSD, so I guess it is not platform related.

[abonander]

This is happening because #[sqlx::test] emits code with the #[test] attribute in it (expecting the #[test] from std) but because you've shadowed that with #[macro_use] extern crate sqlx; it just recurses into itself instead.

It looks like #[tokio::test] avoids this problem by referencing the #[test] attribute with its fully qualified path: https://github.com/tokio-rs/tokio/blob/master/tokio-macros/src/entry.rs#L378

So the fix would be to just do the same thing here and here.

In the meantime, I would recommend just using #[sqlx::test] fully qualified like the examples show.