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Rollup of bare_trait_objects PRs
All deny attributes were moved into bootstrap so they can be disabled with a line of config.
Warnings for external tools are allowed and it's up to the tool's maintainer to keep it warnings free.
r? @Mark-Simulacrum
cc @ljedrz @kennytm
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std::ops::Try impl for std::task::Poll
I originally left out the `Try` impl for `Poll` because I was curious if we needed it, and @MajorBreakfast and I had discussed the potential for it to introduce confusion about exactly what control-flow was happening at different points. However, after porting a pretty significant chunk of Fuchsia over to futures 0.3, I discovered that I was *constantly* having to do repetitive matching on `Poll<Result<...>>` or `Poll<Option<Result<...>>>` in order to propagate errors correctly. `try_poll` (propagate `Poll::Ready(Err(..))`s) helped in some places, but it was far more common to need some form of conversion between `Result`, `Poll<Result<...>>`, and `Poll<Option<Result<...>>>`. The `Try` trait conveniently provides all of these conversions in addition to a more concise syntax (`?`), so I'd like to experiment with using these instead.
cc @seanmonstar
r? @aturon
Note: this change means that far more futures 0.1 code can work without significant changes since it papers over the fact that `Result` is no longer at the top-level when using `Stream` and `Future` (since it's now `Poll<Result<...>>` or `Poll<Option<Result<...>>>` instead of `Result<Poll<..>>` and `Result<Poll<Option<...>>>`).
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Clarify what a task is
Currently we call two distinct concepts "task":
1. The top-level future that is polled until completion
2. The lightweight "thread" that is responsible for polling the top-level future. What additional data beside the future is stored in this type varies between different `Executor` implementations.
I'd prefer to return to the old formulation by @alexcrichton:
```rust
/// A handle to a "task", which represents a single lightweight "thread" of
/// execution driving a future to completion.
pub struct Task {
```
Source: [`task_impl/mod.rs` in futures-rs 0.1](https://github.com/rust-lang-nursery/futures-rs/blob/1328fc9e8af5737183df477c7501e6ea24ff2053/src/task_impl/mod.rs#L49-L50)
I think that this change will make it much easier to explain everything.
r? @aturon
@cramertj
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Since NonNull is Copy the inner field of the cloned Waker was copied for
use in the new LocalWaker, however this left Waker to be dropped. Which
means that when cloning LocalWaker would also erroneously call drop_raw.
This change forgets the Waker, rather then dropping it, leaving the
inner field to be used by the returned LocalWaker.
Closes #52629.
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Unpin references
I also considered adding an impl for raw pointers as well, but that makes it easy to accidentally have unsound owning-collections that might otherwise be able to project pinned-ness (e.g. `Box`).
cc @RalfJung
r? @withoutboats
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These types never project pinned-ness into their contents,
so it is safe for them to be `Unpin`.
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This only changes the directory names; it does not change the "real"
metadata names.
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I don't have a strong opinion on the function vs. method, but there's no point in having both. I'd like to make a `repeat` adaptor like Python/Haskell for turning a value into an infinite stream of the value, so this has to at least be renamed.
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Not necessary just yet but they make ARC not work.
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Conflicts:
src/libcore/logging.rs
src/libcore/rt/local_services.rs
src/libcore/rt/uv/mod.rs
src/libcore/rt/uv/net.rs
src/libcore/rt/uv/uvio.rs
src/libcore/unstable.rs
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fail!() used to require owned strings but can handle static strings
now. Also, it can pass its arguments to fmt!() on its own, no need for
the caller to call fmt!() itself.
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Also fix up all the fallout elsewhere throughout core. It's really nice being
able to have the prelude.
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Closes #6183.
The first commit changes the compiler's method of treating a `for` loop, and all the remaining commits are just dealing with the fallout.
The biggest fallout was the `IterBytes` trait, although it's really a whole lot nicer now because all of the `iter_bytes_XX` methods are just and-ed together. Sadly there was a huge amount of stuff that's `cfg(stage0)` gated, but whoever lands the next snapshot is going to have a lot of fun deleting all this code!
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Hi there,
Really enjoying Rust. Noticed a few typos so I searched around for a few more--here's some fixes.
Ran `make check` and got `summary of 24 test runs: 4868 passed; 0 failed; 330 ignored`.
Thanks!
Sean
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