I tried this code:

#![feature(derive_smart_pointer)]

#[pointee]
fn main() {}

I expected to see this happen: compilation failure

Instead, this happened: compilation succeeded

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rustc --version --verbose:

1.82.0-nightly

2024-07-31 28a58f2fa7f0c46b8fab

cc #123430

see #128444 for where to fix this issue