When hovering over retain in the following snippet, rust-analyzer does not display any tooltip.

use indexmap::IndexMap; // 1.9.3

fn main() {
    let mut map = IndexMap::<(usize, usize), usize>::new();
    map.retain(|_, _| true);
}

If the key is changed to just usize, it starts working again:

use indexmap::IndexMap; // 1.9.3

fn main() {
    let mut map = IndexMap::<usize, usize>::new();
    map.retain(|_, _| true);
}

std::collections::HashMap doesn't seem to have the same issue.

rust-analyzer version: rust-analyzer version: 0.3.1524-standalone

rustc version: rustc 1.71.0-nightly (77f4f828a 2023-05-20)

relevant settings: -