Infinite loop in try_push_visible_item_path

[hvenev]

This happens when an item has an infinite number of visible names:

// pathlooptest/src/lib.rs
pub struct AStruct;

pub mod prelude {
    pub use crate as pathlooptest;
    pub use crate::AStruct;
}

// main.rs
use pathlooptest::prelude::*;

pub fn main() {
    let x: AStruct = 42; // causes error, all public names of AStruct are generated?
}

[hvenev]

The hang can also occur on code that should produce no errors/warnings. However I couldn't find out why.

[jakubadamw]

This seems to be fixed. I verified this in Nightly, 1.45 and 1.44 both with the test case above and using the repro script from #58430 (comment).

@rustbot modify labels to +E-needs-test