`RustLsp expandMacro` fails to work in standalone file

[fjchen7]

Neovim version (nvim -v)

v0.9.4

Operating system/version

macOS

Output of :checkhealth rustaceanvim

==============================================================================
rustaceanvim: require("rustaceanvim.health").check()

Checking for Lua dependencies ~
- OK [mfussenegger/nvim-dap](https://github.com/mfussenegger/nvim-dap) installed.

Checking external dependencies ~
- OK rust-analyzer: found rust-analyzer 0.3.1756-standalone (e402c494b 2023-12-01)
- OK Cargo: found cargo 1.74.0 (ecb9851af 2023-10-18)
- OK rustc: found rustc 1.74.0 (79e9716c9 2023-11-13)
- WARNING       debug adapter: not found.
  Install [lldb](https://lldb.llvm.org/) for extended capabilities.
  A debug adapter (defaults to: LLDB).
  Required for debugging features.

Checking config ~
- OK No errors found in config.

Checking for conflicting plugins ~
- OK No conflicting plugins detected.

How to reproduce the issue

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

Run RustLsp expandMacro on macro println!

Expected behaviour

Expand macro

Actual behaviour

The minimal config used to reproduce this issue.

N/A

[mrcjkb]

Hey 👋

Thanks for reporting.
I may need some more context to reproduce this, as I cannot reproduce it locally, in a project or in a standalone file. Based on the error message in your screenshot, I assume you're calling it in a standalone file?
It looks unrelated to the expandMacro command.
But it's a bug nonetheless. I'll implement a fix for it and we'll see if it helps 😄

[mrcjkb]

I've implemented a fix for the error message in #91.

But if you're using a non-project file, I don't think expandMacro will work, because afaik, rust-analyzer needs a cargo project to do so.

[fjchen7]

I found the cause. The issue occurs when cwd is outside of git repo directory. Thanks @mrcjkb