mirror of
https://github.com/facebook/sapling.git
synced 2024-10-11 01:07:15 +03:00
4f7f38c1a0
Summary:
Add a type to explicitly model a causal chain of errors, akin to
error_chain. This looks a lot like Context, but is intended to show the entire
stack of errors rather than deciding that only the top-level one is
interesting.
This adds a `ChainExt` trait, which adds a `.chain_ext(OuterError)` method to
add another step to the causal chain. This is implemented for:
- `F` where `F: Fail`
- `Error`
- `Result<_, F>` where `F: Fail`
- `Result<_, Error>`
- `Future`/`Stream<Error=F>` where `F: Fail`
- `Future`/`Stream<Error=Error>`
- `Chain`
Using it is simple:
```
let res = something_faily().chain_err(LocalError::new("Something amiss"))?;
```
where `something_faily()` returns any of the above types.
(This is done by adding an extra dummy marker type parameter to the `ChainExt`
trait so that it can avoid problems with the coherence rules - thanks for the idea @[100000771202578:kulshrax]!)
Reviewed By: lukaspiatkowski
Differential Revision: D9394192
fbshipit-source-id: 0817844d283b3900d2555f526c2683231ca7fe12
12 lines
239 B
TOML
12 lines
239 B
TOML
[package]
|
|
name = "failure_ext"
|
|
version = "0.0.1"
|
|
authors = ["Source Control Oncall oncall+source_control@xmail.facebook.com"]
|
|
|
|
[dependencies]
|
|
boxfnonce = "0.1.0"
|
|
futures = "0.1.23"
|
|
failure = "0.1.2"
|
|
failure_derive = "0.1.2"
|
|
slog = "2.3.2"
|