Comments (4)
In order to provide a Clone impl we would need to do either of:
- require that you can only construct anyhow::Error from errors that are Clone, which would make it incompatible with many error types in the wild like io::Error and serde_json::Error; or
- reference-count the internal error.
The first one seems bad to me and the second one makes it impossible to downcast by value which also seems bad (fwiw failure came to the same conclusion in rust-lang-deprecated/failure#148).
Is there a way for you to work around this by using Rc<Error> or Arc<Error> in the tests?
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My first though was about using Arc, but that introduced a ton of changes which were not really needed from the api standpoint. Unfortunately, the work required outweighed the benefit of using anyhow. And there's also the possibility of passing error across 3rd party crates which don't wrap results in anything.
from anyhow.
That's too bad. I am sorry to hear that it didn't work out for your use case!
from anyhow.
I was writing a question about this, but I think I answered it for myself. Here it is, in case anyone else has it.
Q: How can I use anyhow::Result
inside of a global static once_cell::sync::Lazy<anyhow::Result<T>>
, given that the error is not Clone
? How can a caller report the error if it can't be cloned out of the Result
?
A: Use a once_cell::sync::OnceCell<T>
instead and initialize it with get_or_try_init
. Probably wrap all of that inside a function returning anyhow::Result<&T>
, with the OnceCell
as a local static
inside the function body. That gives the error value to the caller who tried to initialize it. Subsequent callers can try again, and they'll get their own errors. (This assumes that either it's ok for subsequent callers to try again, or that you'll quit the first time you encounter an error.)
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Related Issues (20)
- Should `anyhow::Error::chain` return `dyn Error + Send + Sync` HOT 2
- Customize backtrace logic?
- `anyhow!(e)` doesn't preserve `source` for `&Error` HOT 1
- A way to disable anyhow stacktraces (without disabling stacktraces from other crates) HOT 2
- Default Ok-type to `()` in `anyhow::Result` typedef HOT 2
- Updating from version 1.0.76 breaks backtraces HOT 2
- Make backtrace support optional HOT 10
- Possible performance regression on Windows HOT 5
- as_ref() type must be known at this point
- Depending on `CARGO_ENCODED_RUSTFLAGS` may produce stale builds HOT 1
- rust-analyzer nightly throws needless_return warning on bail! HOT 2
- Implement Context for Error
- Question regarding stacktrace
- anyhow::Error to Box<dyn Error> isn't compatible with other libraries HOT 2
- Are you open to de-duplicating the build.rs build probe code? HOT 7
- `anyhow::ensure!` doesn't work with custom error type HOT 1
- Short backtrace HOT 1
- Feature suggestion: ensure_some!() for unwrapping options HOT 3
- Cannot compile when using `ensure!` HOT 1
- Unsound usages of unsafe implementation from `u8` to `str` HOT 2
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