1 unstable release
0.1.0 | Jun 20, 2023 |
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#2046 in Rust patterns
58 downloads per month
Used in pg_task
5KB
source-chain
Formats StdError with it's source chain
#[derive(Debug, thiserror::Error)]
enum Error {
#[error("unknown file {1}")]
UnknownFile(#[source] std::io::Error, &'static str),
}
fn file_error() -> Result<String, Error> {
let filename = "unknown-file.txt";
std::fs::read_to_string(filename).map_err(|e| Error::UnknownFile(e, filename))
}
let err = file_error().unwrap_err();
assert_eq!(
source_chain::to_string(&err),
"unknown file unknown-file.txt\nCaused by:\n\tNo such file or directory (os error 2)"
);
let dyn_err: Box<dyn std::error::Error> = Box::new(err);
assert_eq!(
// notice dereferencing
source_chain::to_string(&*dyn_err),
"unknown file unknown-file.txt\nCaused by:\n\tNo such file or directory (os error 2)"
);
Contributing
We appreciate all kinds of contributions, thank you!
Note on README
Most of the readme is automatically copied from the crate documentation by cargo-sync-readme. This way the readme is always in sync with the docs and examples are tested.
So if you find a part of the readme you'd like to change between <!-- cargo-sync-readme start -->
and <!-- cargo-sync-readme end -->
markers, don't edit README.md
directly, but rather change
the documentation on top of src/lib.rs
and then synchronize the readme with:
cargo sync-readme
(make sure the cargo command is installed):
cargo install cargo-sync-readme
If you have rusty-hook installed the changes will apply automatically on commit.
License
This project is licensed under the MIT license.