Rust-clippy: clippy::redundant_pub_crate conflicts with rustc::unreachable_pub

[matthiaskrgr]

This is my project: https://github.com/matthiaskrgr/cargo-cache
With clippy, I was getting for example

warning: pub(crate) function inside private module
  --> src/test_helpers.rs:38:1
   |
38 | pub(crate) fn assert_path_end(path: &PathBuf, wanted_vector: &[&str]) {
   | ----------^^^^^^^^^^^^^^^^^^^
   | |
   | help: consider using: `pub`
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_pub_crate

However, when I make the function pub
pub fn assert_path_end(path: &PathBuf, wanted_vector: &[&str]) {
rustc warns:

``` Checking cargo-cache v0.4.1 (/home/matthias/vcs/github/cargo-cache) warning: unreachablepubitem --> src/test_helpers.rs:38:1 | 38 | pub fn assert_path_end(path: &PathBuf, wanted_vector: &[&str]) { | ---^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | | | help: consider restricting its visibility:pub(crate)`
|
note: the lint level is defined here
--> src/main.rs:19:5
|
19 | unreachable_pub,
| ^^^^^^^^^^^^^^^
= help: or consider exporting it for use by other crates

Finished dev [unoptimized + debuginfo] target(s) in 0.40s

````

[flip1995]

We should move this lint to nursery until this is fixed.

cc @1tgr I think this lint needs some more work.

[jhpratt]

IMO the lint shouldn't move out of the nursery until rust-lang/rust#74970 is fixed as well. Like it or not, behavior _is_ different currently.

Honestly, I'd prefer the lint be removed outright, but that's obviously my opinion.

[Nugine]

#![deny(unreachable_pub)]
#![deny(clippy::redundant_pub_crate)]

pub(crate) mod utils {
    mod foo {
        /* error: pub(crate) import inside private module */
        pub(crate) fn print_foo() {
            println!("foo")
        }
    }

    /* error: pub(crate) import inside private module */
    pub(crate) use self::foo::print_foo;

    mod bar {
        /* error: unreachable `pub` item */
        pub fn print_bar() {
            println!("bar")
        }
    }

    /* error: unreachable `pub` item */
    pub use self::bar::print_bar;
}

fn main() {}