Crate fn_error_context
source ·Expand description
This crate provides the context
macro for adding extra error
information to a function.
Works with anyhow
, failure
and any other error type which
provides a context
method taking a string.
use fn_error_context::context;
#[context("failed to parse config at `{}`", path.as_ref().display())]
pub fn parse_config(path: impl AsRef<Path>) -> anyhow::Result<u32> {
let text = read_to_string(path.as_ref())?;
Ok(text.parse()?)
}
let error = parse_config("not-found").unwrap_err();
assert_eq!(
error.to_string(),
"failed to parse config at `not-found`",
);
assert_eq!(
error.source().unwrap().downcast_ref::<io::Error>().unwrap().kind(),
io::ErrorKind::NotFound,
);
Attribute Macros
- Add context to errors from a function.