completion-nvim works poorly with rust_analyzer because complete suggestions is missing ()

[JonasRSV]

The problem is that onHover documentation is not working great using completion-nvim for rust-analyzer

fn main() {
    println!("Hello, world!");

    let a : Result<String, String> = Ok(String::from("hi"));
    a.
}

a. will suggest completions such as

a.unwrap
a.ok
a.eq

But it should suggest

a.unwrap(..)
a.ok(..)
a.eq(..)

The problem is that when it does the first suggestion nvim-lsp incorrectly fetched the documentation so that the on-hover information becomes wrong.

Using completion-nvim the onhover documentation is just an empty "()" while using coc-nvim you get

So I believe if completion-nvim also suggested the actual calls then the preview information would be correct. This feature would let me make the switch from CoC.

While if I add the () manually then the nvim builtin lsp returns the correct information when doing onHover. It would be nice if this information was showing when tabbing between completions :)

[etrnal70]

Have you tried to add snippet support ? You can try to add textDocument.completion.completionItem.snippetSupport = true to your LSP capabilities config. It's still a bit buggy though, sometimes it works and sometimes it doesn't

[elkowar]

This is not snippets tho 🤔 I have the same issue here, it just doesn't show the hover popup while completing, ever. Would be great if this could be fixed