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Using it through the crate-local path in `std` means that it shouldn't make an "Implementations on Foreign Types" section in the `std::error::Error` docs.
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Removed extra spaces in front of commas
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Add functions `Duration::try_from_secs_{f32, f64}`
These functions allow constructing a Duration from a floating point value that could be out of range without panicking.
Tracking issue: #83400
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This also adds the error type used, `FromSecsError` and its `impl`s.
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These are currently documented in the API guidelines:
https://rust-lang.github.io/api-guidelines/interoperability.html#error-types-are-meaningful-and-well-behaved-c-good-err
I think it makes sense to uplift this guideline (in a milder form) into
std docs. Printing and producing errors is something that even
non-expert users do frequently, so it is useful to give at least some
indication of what a typical error message looks like.
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Implement Error for &(impl Error)
Opening this up just to see what it breaks. It's unfortunate that `&(impl Error)` doesn't actually implement `Error`. If this direct approach doesn't work out then I'll try something different, like an `Error::by_ref` method.
**EDIT:** This is a super low-priority experiment so feel free to cancel it for more important crater runs! 🙂
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# Stabilization Report
## Why?
We've been working for the last few years to try "fix" the `Error` trait, which is probably one of the most fundamental in the whole standard library. One of its issues is that we commonly expect you to work with abstract errors through `dyn Trait`, but references and smart pointers over `dyn Trait` don't actually implement the `Error` trait. If you have a `&dyn Error` or a `Box<dyn Error>` you simply can't pass it to a method that wants a `impl Error`.
## What does this do?
This stabilizes the following trait impl:
```rust
impl<'a, T: Error + ?Sized + 'static> Error for &'a T;
```
This means that `&dyn Error` will now satisfy a `impl Error` bound.
It doesn't do anything with `Box<dyn Error>` directly. We discussed how we could do `Box<dyn Error>` in the thread here (and elsewhere in the past), but it seems like we need something like lattice-based specialization or a sprinkling of snowflake compiler magic to make that work. Having said that, with this new impl you _can_ now get a `impl Error` from a `Box<dyn Error>` by dereferencing it.
## What breaks?
A crater run revealed a few crates broke with something like the following:
```rust
// where e: &'short &'long dyn Error
err.source()
```
previously we'd auto-deref that `&'short &'long dyn Error` to return a `Option<&'long dyn Error>` from `source`, but now will call directly on `&'short impl Error`, so will return a `Option<&'short dyn Error>`. The fix is to manually deref:
```rust
// where e: &'short &'long dyn Error
(*err).source()
```
In the recent Libs meeting we considered this acceptable breakage.
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Now that #76934 has merged, we can remove a lot of these! E.g, this is
no longer necessary:
[`Vec<T>`]: Vec
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This impl was effectively stable. #[unstable] had no effect here,
since both Error and LayoutErr were already stable.
This effectively became stable as soon as LayoutErr became stable, which
was in 1.28.0.
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Also doing fmt inplace as requested.
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Co-authored-by: Joshua Nelson <joshua@yottadb.com>
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Co-authored-by: Joshua Nelson <joshua@yottadb.com>
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