Macro parameter for migrations folder causes compile-time error in version 0.8

[klefevre]

Bug Description

In version 0.8, there is a regression that prevents us from upgrading due to an error when passing the migrations folder as a parameter to a macro. We use macros to generate our test cases, but the migration parameter triggers a compile-time error.

error: expected string for `false`
  --> src/main.rs:9:26
   |
9  |             #[sqlx::test(migrations = $migrations, fixtures(path = "./fixtures", scripts($fixture)))]
   |                          ^^^^^^^^^^
...
16 |     my_macro!(hello_test3, "./migrations/a", "a");
   |     --------------------------------------------- in this macro invocation

0.8.0, 0.8.1, 0.8.2 give all the same error.

Minimal Reproduction

#[cfg(test)]
mod tests {
    macro_rules! my_macro {
        ($func:ident, $migrations:literal, $fixture:literal) => {
            #[sqlx::test(migrations = $migrations, fixtures(path = "./fixtures", scripts($fixture)))]
            async fn $func(_pool: sqlx::PgPool) {}
        };
    }

    my_macro!(hello_test1, "./migrations/a", "test_foo");
    my_macro!(hello_test2, "./migrations/b", "test_foo");
    my_macro!(hello_test3, "./migrations/a", "test_bar");
    my_macro!(hello_test4, "./migrations/b", "test_bar");
}

Note that both literal and expr have been tested, but neither resolves the issue.

Info

• SQLx version: 0.8.2
• SQLx features enabled: postgres
• Database server and version: Postgres 14
• Operating system: macOS 14.6.1
• rustc --version: rustc 1.81.0 (eeb90cda1 2024-09-04)