How to debug this panicking code?

[xuanmizhen]

use futures::executor::block_on;

async fn request() -> Result<(), reqwest::Error> {
    let response = reqwest::get("https://rustcc.cn").await?;  // Panic here according to backtrace
    Ok(())
}

fn main() -> Result<(), reqwest::Error> {
    block_on(request())
}

[ambiso]

You didn't set up an async runtime.

You can do it like so:

#[tokio::main]
async fn main() -> Result<(), reqwest::Error> {
    request().await?;
    Ok(())
}

this works after adding tokio with cargo add tokio --features=full

Alternatively, you can also create the runtime explicitly:

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let rt  = tokio::runtime::Runtime::new()?;
    rt.block_on(request())?;
    Ok(())
}

[jofas]

Yeah, reqwest requires the tokio runtime. It won't work with futures::executor.

[xuanmizhen]

Thanks.