rust-analyzer does not work with sing-file program

[NewUserHa]

rust-analyzer version: rust-analyzer version: 0.3.2284-standalone (1f86729 2025-01-28) [c:\Users\user.vscode\extensions\rust-lang.rust-analyzer-0.3.2284-win32-x64\server\rust-analyzer.exe]

rustc version: rustc 1.84.0 (9fc6b4312 2025-01-07)

editor or extension: vscode 1.95.3

relevant settings: not set

repository link (if public, optional):

code snippet to reproduce:

fn main(){
    prin
}

vscode rust analyzer output

2025-01-30T19:26:59.6380447+08:00 ERROR FetchWorkspaceError: rust-analyzer failed to fetch workspace
2025-01-30T19:27:20.3397039+08:00 ERROR FetchWorkspaceError: rust-analyzer failed to fetch workspace
2025-01-30T19:27:37.8238752+08:00 ERROR FetchWorkspaceError: rust-analyzer failed to fetch workspace

[ChayimFriedman2]

Do you have a Cargo project?

[NewUserHa]

it works with a cargo.toml, but it does not work without that. it should work according to #12310 (comment)

[ChayimFriedman2]

No it should not. Very basic features work, autocomplete atc. do not.

[NewUserHa]

No. Nothing of the features works.

the rust-analyzer should work like all other language servers that work for single file program, to be friendly to write small programs, like small tests

[ChayimFriedman2]

Parsing etc. should work (I don't know the set of features that work exactly, but anything requiring semantic information is not there).

rust-analyzer depends on Cargo, and it's probably not going to change. Cargo script will make this better though.

[NewUserHa]

this depends on cargo.toml is very inconvenient for small programs with rust.

maybe could add a feature to quickly switch to a dummy cargo.toml for situation like quick experiments, startups, and small single file programs, in the pannel from the bottom at vscode toolbars

[ChayimFriedman2]

Cargo script will handle that, once stabilized.

[NewUserHa]

Thanks

but the rust-analyzer is stucked at loading and no error is printed with lines below

#!cargo

//! ```cargo
//! ```

fn main(){
    prin
}

[Error - 17:00:31 AM] Server process exited with code 0.

[Veykril]

To support cargo scripts you currently need to point rust-analyzer to the rust file via the linkedProjects config. Lazy loading is yet to be properly implemented and that will take some time after other refactors are done