No warning for unread pub struct field in private module

[tormeh]

I tried this code:

fn main() {
    let _ = foo::Bar1{baz: false};
    let _ = foo::Bar2{baz: false};
}

mod foo {
    pub struct Bar1 {
        pub baz: bool,
    }

    pub(crate) struct Bar2 {
        pub baz: bool,
    }
}

I expected a "field baz is never read" warning for both Bar1 and Bar2 structs. Instead, I only got this warning for Bar2.

Meta

rustc --version --verbose:

rustc 1.75.0 (82e1608df 2023-12-21)
binary: rustc
commit-hash: 82e1608dfa6e0b5569232559e3d385fea5a93112
commit-date: 2023-12-21
host: x86_64-apple-darwin
release: 1.75.0
LLVM version: 17.0.6

Same behavior when running RUSTUP_TOOLCHAIN=nightly-2024-01-01-x86_64-apple-darwin cargo check

RUSTUP_TOOLCHAIN=nightly-2024-01-01-x86_64-apple-darwin rustc --version --verbose:

rustc 1.77.0-nightly (e51e98dde 2023-12-31)
binary: rustc
commit-hash: e51e98dde6a60637b6a71b8105245b629ac3fe77
commit-date: 2023-12-31
host: x86_64-apple-darwin
release: 1.77.0-nightly
LLVM version: 17.0.6

[tormeh]

In case it's relevant: The rest of the package consists of the results of running cargo new vistest with cargo 1.75.0, with no extra arguments.

[krtab]

@rustbot claim