VSCode plugin only works in main.rs

[aecorredor]

I'm going through https://github.com/LukeMathWalker/build-your-own-jira-with-rust and had been previously using RLS. I just switched to rust-analyzer and the plugin is only working in the main.rs file. In any other file it doesn't work at all. The run links are in the file, but there is no auto-completion nor hints (hover or inlay).

I went through the manual and first uninstalled RLS and restarted VSCode before even installing rust-analyzer.

[lnicola]

It works for me in most files:

But not in jira-wip/src/koans, because those files are not in the project structure, so rust-analyzer doesn't know about them. It looks like koans-framework fills in the initially empty path_to_enlightenment.rs with include! directives like include!("koans/00_greetings/00_greetings.rs");.

That doesn't work great because the file still lies outside of the project. Consider what happens if a file is include!d from two different places: it might have completely different meanings, and rust-analyzer won't know which context you want. It's probably a known issue, but CC @edwin0cheng.

A workaround is to replace the include! with something like

#[path = "koans/00_greetings/00_greetings.rs"]
mod greetings;

This doesn't seem to break the koans tool, so it still works.

[lnicola]

More clearly, the issue with include! is that you can have:

//- lib.rs
mod m1 {
    struct S {
        foo: i32,
    }

    include!("fun.rs");
}

mod m2 {
    struct S {
        foo: String,
    }

    include!("fun.rs");
}

//- fun.rs
fn frob(s: S) {
    let _ = s.foo; // what type is this?
}

[lnicola]

Filed LukeMathWalker/build-your-own-jira-with-rust#33.

[matklad]

Yeah, supporting code inside includes properly is kinda hard. That's on the radar, but is not a top priority at the moment. I am going to close this issue, as there's nothing immediatelly actionable here.

[ycjcl868]

same issue + 1

[bernd-k1337]

still the same issue

[poyrazhancilar]

Same issue goes on

[curiouscod3]

same issue here. It only works in main.rs!

[danielarcini]

I would really like it if it also worked outside of my main.rs file. Did anyone find a work around to this? been 2 years and still no fix.

[lnicola]

You need to set up a proper module structure. If your code compiles, please provide an example.

[matklad]

Idea: we can switch ra status to red if the currently opened file is .rs unknown to ra? Would also help #13226

[ben-xshen]

not so difficulte i found directly declare the mod, and keep the mod name same as the filename, then u the mod can get the code intelligence again.... to tell the truth i don't know why the plugin is designed like such, or they just wanna to reduce the possibility of the no-used-declaration and tell u "hey buddy, u need to use it first or i cannot provide the support for u"?