single_component_path_imports false positive for macros used in the same module

[SabrinaJewson]

Lint name: single_component_path_imports

I tried this code:

m!();
macro_rules! m { () => {} }
use m;

I expected to see this happen: Clippy would not warn

Instead, this happened: Clippy showed this warning:

warning: this import is redundant
 --> src/lib.rs:3:1
  |
3 | use m;
  | ^^^^^^ help: remove it entirely
  |
  = note: `#[warn(clippy::single_component_path_imports)]` on by default
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_component_path_imports

Meta

Rust version (rustc -Vv):

rustc 1.58.0-nightly (29b124802 2021-10-25)
binary: rustc
commit-hash: 29b1248025b19bd132c8047fc710ea9314b9b76b
commit-date: 2021-10-25
host: x86_64-unknown-linux-gnu
release: 1.58.0-nightly
LLVM version: 13.0.0

cc #7106

@rustbot label +I-suggestion-causes-error

[BartMassey]

Just ran into this.

pub mod m {
    pub fn f() {
        super::g!();
    }
}

macro_rules! g {
    () => {
        println!("hello");
    };
}
use g;

As noted, following Clippy's suggestion fails compilation. g needs to be accessible inside m and there's no other way (that I am aware of) to make that possible— except #[macro_export], which will make it visible outside the containing crate.

It appears that single_component_path_imports is global-only and cannot be suppressed on a case-by-case basis. Compare with #7290.

[xFrednet]

@rustbot claim