unused function in imported file should give warning

[lucasly-ba]

code :
main.rs:

mod b;
use b::b
fn main(){}

b.rs:

pub fn b() {}

[powerboat9]

Replicated with https://godbolt.org/z/ezoPWGhdd

mod a {
    pub fn foo() {}
}

use a::foo;

[shreyas-omkar]

Let me see if I can fix this.

[Naveen447-a11y]

It appears that unused public functions from imported modules are not
currently triggering a warning.

I’d like to investigate how unused items from imported files are being
handled during analysis and explore whether a warning can be emitted
in such cases.

Could I work on this issue?