`redundant_pub_crate` false positive on local macros

[digama0]

Summary

This is similar to #8732, but it triggers even without a re-export. Here we are defining a module-scoped macro foo inside private module test, and the error message says that it is a pub(crate) macro (which is false, you can't access the macro from another file even if test was pub because it is not #[macro_export]), and you should use pub instead (which does not match the intended meaning of the code, it's a private macro) (and this is also not syntactically correct, pub macro_rules! is not legal).

Lint Name

redundant_pub_crate

Reproducer

I tried this code:

#![warn(clippy::redundant_pub_crate)]
mod test {
  macro_rules! foo { () => {} }
  foo! {}
}
fn main() {}

I saw this happen:

warning: pub(crate) macro inside private module
 --> src/main.rs:3:3
  |
3 |   macro_rules! foo { () => {} }
  |   -^^^^^^^^^^^^^^^
  |   |
  |   help: consider using: `pub`
  |
note: the lint level is defined here
 --> src/main.rs:1:9
  |
1 | #![warn(clippy::redundant_pub_crate)]
  |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_pub_crate

Version

rustc 1.62.0-nightly (69a5d2481 2022-04-27)
binary: rustc
commit-hash: 69a5d2481e856a5a18885390b8cf6950b9ff8dd3
commit-date: 2022-04-27
host: x86_64-unknown-linux-gnu
release: 1.62.0-nightly
LLVM version: 14.0.1

Additional Labels

@rustbot label +I-suggestion-causes-error

[Serial-ATA]

@rustbot claim

[Serial-ATA]

Pretty sure #8736 fixed this, I can't reproduce it.

[digama0]

Just pulled the latest nightly, the issue still seems to happen:

$ rustc +nightly -Vv
rustc 1.62.0-nightly (a707f4010 2022-04-29)
binary: rustc
commit-hash: a707f401074bc769bab4efb2bfdde7f6c5a4068d
commit-date: 2022-04-29
host: x86_64-unknown-linux-gnu
release: 1.62.0-nightly
LLVM version: 14.0.1

$ cargo +nightly clippy --version
clippy 0.1.62 (a707f40 2022-04-29)

$ cargo +nightly clippy
    Checking rust-test v0.1.0 (/rust-test)
warning: pub(crate) macro inside private module
 --> src/main.rs:3:3
  |
3 |   macro_rules! foo { () => {} }
  |   -^^^^^^^^^^^^^^^
  |   |
  |   help: consider using: `pub`
  |
note: the lint level is defined here
 --> src/main.rs:1:9
  |
1 | #![warn(clippy::redundant_pub_crate)]
  |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_pub_crate

warning: `rust-test` (bin "rust-test") generated 1 warning
    Finished dev [unoptimized + debuginfo] target(s) in 0.03s

I also tried the test files from #8736, and I got the same error:

mod issue_8732 {
    #[allow(unused_macros)]
    macro_rules! some_macro { // error here
        () => {};
    }

    #[allow(unused_imports)]
    pub(crate) use some_macro; // error here
}

[y21]

This issue seems to be fixed? None of the test cases trigger anymore: https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=a31d64a5ff10926dd80c2c97a03b2978

[digama0]

Confirmed, the tests seem to pass after nightly-2022-05-06. Looking at what happened on that day I can only guess it was something that changed in the upstream nightly bump 7e017db.