What is the Clippy lint to flag used underscore-prefixed functions?

[laniakea64]

For example:

fn _foo() {
  println!("Foo");
}

fn main() {
  //_foo();
}

Using Rust 1.80.1, this code compiles without warnings and passes Clippy without warnings, and continues to do so after uncommenting the call to _foo().

When the call to _foo() is uncommented, I would like Clippy to warn that an underscore-prefixed function is being used. What is the Clippy lint to flag this?

(Sorry if this is a silly question, but couldn't find the answer myself searching the list of Clippy lints - closest was https://rust-lang.github.io/rust-clippy/stable/index.html#/used_underscore_binding but seems that's only for use of let _foo = ...?)

[flip1995]

I don't think there currently is a link for that. It could be an extension for the use_underscore_binding lint. Even though the lint might have to be renamed or maybe a new lint created (used_underscore_items)

[laniakea64]

Thanks flip1995 for the answer. In that case I'll file a new lint suggestion issue.

Edit: ➡️ #13260