Normalize late-bound regions in bare functions, stack closures, and traits and include them in the generated hash.
Closes#19791
r? @nikomatsakis (does my normalization make sense?)
cc @alexcrichton
This commit deprecates a few more in-tree libs for their crates.io counterparts.
Note that this commit does not make use of the #[deprecated] tag to prevent
warnings from being generated for in-tree usage. Once #[unstable] warnings are
turned on then all external users will be warned to move.
These crates have all been duplicated in rust-lang/$crate repositories so
development can happen independently of the in-tree copies. We can explore at a
later date replacing the in-tree copies with the external copies, but at this
time the libraries have changed very little over the past few months so it's
unlikely for changes to be sent to both repos.
cc #19260
Hello! This is my first Rust patch, and I fear that I've probably skipped at least 7 critical steps. I'd appreciate your feedback and advice about how to contribute to Rust.
This patch is based on a discussion with @BurntSushi in #14602 a while back. I'm happy to revise it as needed to fit into the modern world. :-)
As discussed in that issue, the existing `at` and `name` functions represent two different results with the empty string:
1. Matched the empty string.
2. Did not match anything.
Consider the following example. This regex has two named matched groups, `key` and `value`. `value` is optional:
```rust
// Matches "foo", "foo;v=bar" and "foo;v=".
regex!(r"(?P<key>[a-z]+)(;v=(?P<value>[a-z]*))?");
```
We can access `value` using `caps.name("value")`, but there's no way for us to distinguish between the `"foo"` and `"foo;v="` cases.
Early this year, @BurntSushi recommended modifying the existing `at` and `name` functions to return `Option`, instead of adding new functions to the API.
This is a [breaking-change], but the fix is easy:
- `refs.at(1)` becomes `refs.at(1).unwrap_or("")`.
- `refs.name(name)` becomes `refs.name(name).unwrap_or("")`.
Using a type alias for iterator implementations is fragile since this exposes the implementation to users of the iterator, and any changes could break existing code.
This PR changes the iterators of `BTreeMap`, `BTreeSet`, `HashMap`, and `HashSet` to use proper new types, rather than type aliases. However, since it is fair-game to treat a type-alias as the aliased type, this is a:
[breaking-change].
The primary focus of Rust's stability story at 1.0 is the standard library.
All other libraries distributed with the Rust compiler are planned to
be #[unstable] and therfore only accessible on the nightly channel of Rust. One
of the more widely used libraries today is libserialize, Rust's current solution
for encoding and decoding types.
The current libserialize library, however, has a number of drawbacks:
* The API is not ready to be stabilize as-is and we will likely not have enough
resources to stabilize the API for 1.0.
* The library is not necessarily the speediest implementations with alternatives
being developed out-of-tree (e.g. serde from erickt).
* It is not clear how the API of Encodable/Decodable can evolve over time while
maintaining backwards compatibility.
One of the major pros to the current libserialize, however, is
`deriving(Encodable, Decodable)` as short-hands for enabling serializing and
deserializing a type. This is unambiguously useful functionality, so we cannot
simply deprecate the in-tree libserialize in favor of an external crates.io
implementation.
For these reasons, this commit starts off a stability story for libserialize by
following these steps:
1. The deriving(Encodable, Decodable) modes will be deprecated in favor of a
renamed deriving(RustcEncodable, RustcDecodable).
2. The in-tree libserialize will be deprecated in favor of an external
rustc-serialize crate shipped on crates.io. The contents of the crate will be
the same for now (but they can evolve separately).
3. At 1.0 serialization will be performed through
deriving(RustcEncodable, RustcDecodable) and the rustc-serialize crate. The
expansions for each deriving mode will change from `::serialize::foo` to
`::rustc_serialize::foo`.
This story will require that the compiler freezes its implementation of
`RustcEncodable` deriving for all of time, but this should be a fairly minimal
maintenance burden. Otherwise the crate in crates.io must always maintain the
exact definition of its traits, but the implementation of json, for example, can
continue to evolve in the semver-sense.
The major goal for this stabilization effort is to pave the road for a new
official serialization crate which can replace the current one, solving many of
its downsides in the process. We are not assuming that this will exist for 1.0,
hence the above measures. Some possibilities for replacing libserialize include:
* If plugins have a stable API, then any crate can provide a custom `deriving`
mode (will require some compiler work). This means that any new serialization
crate can provide its own `deriving` with its own backing
implementation, entirely obsoleting the current libserialize and fully
replacing it.
* Erick is exploring the possibility of code generation via preprocessing Rust
source files in the near term until plugins are stable. This strategy would
provide the same ergonomic benefit that `deriving` does today in theory.
So, in summary, the current libserialize crate is being deprecated in favor of
the crates.io-based rustc-serialize crate where the `deriving` modes are
appropriately renamed. This opens up space for a later implementation of
serialization in a more official capacity while allowing alternative
implementations to be explored in the meantime.
Concretely speaking, this change adds support for the `RustcEncodable` and
`RustcDecodable` deriving modes. After a snapshot is made warnings will be
turned on for usage of `Encodable` and `Decodable` as well as deprecating the
in-tree libserialize crate to encurage users to use rustc-serialize instead.
Using a type alias for iterator implementations is fragile since this
exposes the implementation to users of the iterator, and any changes
could break existing code.
This commit changes the iterators of `VecMap` to use
proper new types, rather than type aliases. However, since it is
fair-game to treat a type-alias as the aliased type, this is a:
[breaking-change].
Part of #18469
[breaking-change]
A receiver will only ever get a single auto-reference. Previously arrays and strings would get two, e.g., [T] would be auto-ref'ed to &&[T]. This is usually apparent when a trait is implemented for `&[T]` and has a method takes self by reference. The usual solution is to implement the trait for `[T]` (the DST form).
r? @nikomatsakis (or anyone else, really)
The names expected and actual are not used anymore in the output. It also
removes the confusion that the argument order is the opposite of junit.
Bug #7330 is relevant.
per rfc 459
cc https://github.com/rust-lang/rust/issues/19390
One question is: should we start by warning, and only switch to hard error later? I think we discussed something like this in the meeting.
r? @alexcrichton
Was testing rustup on a very minimal Debian installation and got errors during the install process (error occurred in `install.sh` of the Rust nightly.)
Noticed that Rustup was downloading the i686 nightly instead of x86-64. Installing `file` fixed the problem, and this patch adds the probe to ensure file is installed before attempting to use it.
There may still be an issue with the i686 installation, I did not investigate further.
Part of #18469
[breaking-change]
A receiver will only ever get a single auto-reference. Previously arrays and strings would get two, e.g., [T] would be auto-ref'ed to &&[T]. This is usually apparent when a trait is implemented for `&[T]` and has a method takes self by reference. The usual solution is to implement the trait for `[T]` (the DST form).
This commit performs a second pass stabilization of the `std::default` module.
The module was already marked `#[stable]`, and the inheritance of `#[stable]`
was removed since this attribute was applied. This commit adds the `#[stable]`
attribute to the trait definition and one method name, along with all
implementations found in the standard distribution.
This commit takes a second pass through the `std::mem` module for stabilization.
The only remaining non-stable items in this module were `forget`, `transmute`,
`copy_lifetime`, and `copy_lifetime_mut`.
The `forget` and `transmute` intrinsics themselves were marked `#[stable]` to
propgate into the `core::mem` module so they would be marked stable.
The `copy_lifetime` functions were left `unstable`, but `Sized?` annotations
were added to the parameters to allow more general use with DSTs.
The `size_of_val`, `min_align_of_val`, and `align_of_val` functions would like
to grow `Sized?` bounds, but this is a backwards compatible change that
currently ICEs the compiler, so this change was not made at this time.
Finally, the module itself was declared `#![stable]` in this pass.
