Should_panic can be applied to non-tests

[JonathanBrouwer]

I tried this code:

#[should_panic]
pub fn main() {}

I expected this to produce a warning or error.

Instead, it produces no warnings/errors.

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rustc --version --verbose:

cargo 1.90.0-nightly (930b4f62c 2025-06-28)
release: 1.90.0-nightly
commit-hash: 930b4f62cfcd1f0eabdb30a56d91bf6844b739bf
commit-date: 2025-06-28
host: x86_64-unknown-linux-gnu
libgit2: 1.9.0 (sys:0.20.2 vendored)
libcurl: 8.12.1-DEV (sys:0.4.80+curl-8.12.1 vendored ssl:OpenSSL/3.5.0)
ssl: OpenSSL 3.5.0 8 Apr 2025
os: Arch Linux Rolling Release [64-bit]

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