I'm trying to get the example implementation from the "clap" crate working, as below:

use clap::Parser;

/// Simple program to greet a person
#[derive(Parser, Debug)]
#[command(version, about, long_about = None)]
struct Args {
    /// Name of the person to greet
    #[arg(short, long)]
    name: String,

    /// Number of times to greet
    #[arg(short, long, default_value_t = 1)]
    count: u8,
}

fn main() {
    let args = Args::parse();

    for _ in 0..args.count {
        println!("Hello {}!", args.name);
    }
}

However, it fails on the derive macro for Args, with the following error:

proc macro server error: Cannot create expander for C:\<path to clap_derive-d7e84929d03230d8.dll>: LoadLibraryExW failed

I am running the above on Windows 11 in Visual Studio Code, with:

• clap v4.6.1
• rust-analyzer v0.3.2929
• cargo v1.96.0
• rustup v1.29.0

I've tried the following solutions:

• cargo update
• cargo clean
• Switching rust-analyzer to pre-release
• Changing the toolchain from stable-x86_64-pc-windows-gnu to stable-x86_64-pc-windows-msvc (and vice versa)
• In settings.json, changing rust-analyzer.rustc.source to discover

None of the above works.

2 posts - 2 participants

Read full topic