crash when typing println!(" in Rust: ts_parser__handle_error: Assertion `did_merge' failed

[ckp95]

Problem

When working on a project I found that Neovim would consistently crash in a certain Rust file whenever I typed the characters println!(". It would crash exactly when I typed the ". The error message flashes up only for a frame or so, but I caught it in a recording:

Screencast_20240410_211134.webm

I reduced the file to the following minimal example:

fn main() {
    println!("");
    for x in y {
        if true {
            true;
        } else {
            println!("");
        }
    }
}

Typing println!(" in the function makes it crash. As far as I can tell, removing any other aspect of the function body suppresses the error. e.g. removing the loop body, removing branches of the if expression, removing either of the printlns.

Also, running TSBufDisable highlight prevents the crash, so presumably it is treesitter-related.

Steps to reproduce

Stacktrace:

bt.txt

My neovim flake, it's not minimal but you should be able to reproduce the problem since everything is pinned:

https://github.com/ckp95/nvflake

Expected behavior

It should not crash when I type println!("

Neovim version (nvim -v)

v0.9.5

Vim (not Nvim) behaves the same?

idk

Operating system/version

NixOS 24.05

Terminal name/version

konsole 24.02.0

$TERM environment variable

xterm-256color

Installation

custom Nix flake

[lucario387]

Sounds like tree-sitter/tree-sitter-rust#215

[ckp95]

Sounds like tree-sitter/tree-sitter-rust#215

It's not quite the same. I can write that example and it doesn't crash for me:

fn main () {
    panic!("hello");
}

[Gauravst]

same with html ...