2026-05-04

Discoveries

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Rust Things

Cheap trace in no_std:

struct ErrorInfo {
    message: &'static str,
    file: &'static str,
    line: u32,
}

macro_rules! error_info {
    ($msg:expr) => {
        ErrorInfo {
            message: $msg,
            file: file!(),   // built-in macro, returns &'static str
            line: line!(),   // built-in macro, returns u32
        }
    };
}

fn something() -> Result<(), ErrorInfo> {
    Err(error_info!("something went wrong"))
}