errlog

errlog is a simple log library based on anyhow, it wraps file name and line number for your error message.

Add the errlog dependencies into your Cargo.toml, then import errlog macro

use errlog::{elog, AnyContext, AnyResult};

Now you can use it in function that return AnyResult<xxx> such as

return Err(elog!("Unkown file type")); 

or

File:open(filepath).context(elog!("Cannot open file {}", filepath))?;