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Stabilise exhaustive integer patterns - #56362
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rust-highfive
commented
Nov 30, 2018
r? @estebank (rust_highfive has picked a reviewer for you, use r? to override) |
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varkor
commented
Nov 30, 2018
@Centril: I think you're right; there's a bug with the handling of floating-point numbers here. I'll look into it and add another test case. |
Centril
commented
Nov 30, 2018
@varkor For completeness I'd also include a test case that shows that removing the |
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4406391CompareCentril
commented
Dec 1, 2018
@estebank Are we happy with the PR? |
| } | ||
| } | ||
| pub fn is_pointer_sized(&self) -> bool { |
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This name doesn't feel ideal. I'd rather have is_target_agnostic_primitive that return true only for non-{u,i}size integer types, char and floating-point types.
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It seems like reversing the sense of this function would complicate some of the tests below, in particular the one that checks (is_pointer_sized() && !feature.pointer_sized) or whatever. I think the function is ok "as is" though. I mean the isize and usize pattern are meant (I think) to evoke the "native size" of a pointer. I might prefer is_pointer_sized_int though, just to be a bit more specific (is_target_dependent_int would be ok too but feels less obvious to me).
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Yes, the function is used explicitly for the pointer-sized integers, so making it more general would obfuscate the uses. I can make the name a bit more descriptive as suggested, though.
eddyb
commented
Dec 2, 2018
estebank
commented
Dec 3, 2018
@Centril LGTM++, but I'll defer to niko's review. |
nikomatsakis
left a comment
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r=me -- not sure how much @eddyb cares about the name of is_pointer_sized though
nikomatsakis
commented
Dec 4, 2018
@bors r+ |
bors
commented
Dec 4, 2018
📌 Commit 4406391 has been approved by |
bors
commented
Dec 6, 2018
📌 Commit 5be3f0e001f7e3e88fe4f19d173a1fd5fca18142 has been approved by |
bors
commented
Dec 6, 2018
☔ The latest upstream changes (presumably #56557) made this pull request unmergeable. Please resolve the merge conflicts. |
rust-highfive
commented
Dec 6, 2018
The job Click to expand the log.I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact |
5be3f0e to
944bb2cComparevarkor
commented
Dec 6, 2018
@bors r=nikomatsakis rollup I didn't spot what was going on before I force pushed, so now the change in this PR looks funny, but the original change got merged as part of the rollup #56557, without the fixes to the tests on 16-bit pointer size platforms. It's probably simplest to just merge the 16-bit fix as this PR now, but close the related issues. |
bors
commented
Dec 6, 2018
📌 Commit 944bb2ce8c41fa16839eb2834d99eaa079fd237a has been approved by |
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944bb2c to
49e4f26Comparerust-highfive
commented
Dec 6, 2018
The job Click to expand the log.I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact |
kennytm
commented
Dec 6, 2018
varkor
commented
Dec 6, 2018
I've submitted #56567 as a follow up issue and I'll close this PR. |
…arkor Fix stabilization version numbers (exhaustive_integer_patterns + macro_literal_matcher) + `exhaustive_integer_patterns` slipped 1.32; merged in 1.33 -- rust-lang#56362 + `macro_literal_matcher` isn't stable on current stable (1.31) but is on beta (1.32). r? @varkor
…arkor Fix stabilization version numbers (exhaustive_integer_patterns + macro_literal_matcher) + `exhaustive_integer_patterns` slipped 1.32; merged in 1.33 -- rust-lang#56362 + `macro_literal_matcher` isn't stable on current stable (1.31) but is on beta (1.32). r? @varkor
Pkgsrc changes:
* Bump required rust version to build to 1.32.0.
* Adapt patches to changed file locations.
* Since we now patch some more vendor/ modules, doctor the corresponding
.cargo-checksum.json files accordingly
Upstream changes:
Version 1.33.0 (2019-02-28)
==========================
Language
--------
- [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
`#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
- [Integer patterns such as in a match expression can now be exhaustive.][56362]
E.g. You can have match statement on a `u8` that covers `0..=255` and
you would no longer be required to have a `_ => unreachable!()` case.
- [You can now have multiple patterns in `if let` and `while let`
expressions.][57532] You can do this with the same syntax as a `match`
expression. E.g.
```rust
enum Creature {
Crab(String),
Lobster(String),
Person(String),
}
fn main() {
let state = Creature::Crab("Ferris");
if let Creature::Crab(name) | Creature::Person(name) = state {
println!("This creature's name is: {}", name);
}
}
```
- [You can now have irrefutable `if let` and `while let` patterns.][57535]
Using this feature will by default produce a warning as this behaviour
can be unintuitive. E.g. `if let _ = 5 {}`
- [You can now use `let` bindings, assignments, expression statements,
and irrefutable pattern destructuring in const functions.][57175]
- [You can now call unsafe const functions.][57067] E.g.
```rust
const unsafe fn foo() -> i32 { 5 }
const fn bar() -> i32 {
unsafe { foo() }
}
```
- [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
E.g. `#[cfg_attr(all(), must_use, optimize)]`
- [You can now specify a specific alignment with the `#[repr(packed)]`
attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a
struct with an alignment of 2 bytes and a size of 6 bytes.
- [You can now import an item from a module as an `_`.][56303] This allows you
to import a trait's impls, and not have the name in the namespace. E.g.
```rust
use std::io::Read as _;
// Allowed as there is only one `Read` in the module.
pub trait Read {}
```
- [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
Compiler
--------
- [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
command line argument.][56351]
- [The mininum required LLVM version has been bumped to 6.0.][56642]
- [Added support for the PowerPC64 architecture on FreeBSD.][57615]
- [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
tier 2 support.][57130] Visit the [platform support][platform-support]
page for information on Rust's platform support.
- [Added support for the `thumbv7neon-linux-androideabi` and
`thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
- [Added support for the `x86_64-unknown-uefi` target.][56769]
Libraries
---------
- [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
functions for all numeric types.][57566]
- [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul,
shl, shr}`
are now `const` functions for all numeric types.][57105]
- [The methods `is_positive` and `is_negative` are now `const` functions for
all signed numeric types.][57105]
- [The `get` method for all `NonZero` types is now `const`.][57167]
- [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
`swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
numeric types.][57234]
- [`Ipv4Addr::new` is now a `const` function][57234]
Stabilized APIs
---------------
- [`unix::FileExt::read_exact_at`]
- [`unix::FileExt::write_all_at`]
- [`Option::transpose`]
- [`Result::transpose`]
- [`convert::identity`]
- [`pin::Pin`]
- [`marker::Unpin`]
- [`marker::PhantomPinned`]
- [`Vec::resize_with`]
- [`VecDeque::resize_with`]
- [`Duration::as_millis`]
- [`Duration::as_micros`]
- [`Duration::as_nanos`]
Cargo
-----
- [Cargo should now rebuild a crate if a file was modified during the initial
build.][cargo/6484]
Compatibility Notes
-------------------
- The methods `str::{trim_left, trim_right, trim_left_matches,
trim_right_matches}` are now deprecated in the standard library, and their
usage will now produce a warning. Please use the `str::{trim_start,
trim_end, trim_start_matches, trim_end_matches}` methods instead.
- The `Error::cause` method has been deprecated in favor of `Error::source`
which supports downcasting.
[55982]: rust-lang/rust#55982
[56303]: rust-lang/rust#56303
[56351]: rust-lang/rust#56351
[56362]: rust-lang/rust#56362
[56642]: rust-lang/rust#56642
[56769]: rust-lang/rust#56769
[56805]: rust-lang/rust#56805
[56947]: rust-lang/rust#56947
[57049]: rust-lang/rust#57049
[57067]: rust-lang/rust#57067
[57105]: rust-lang/rust#57105
[57130]: rust-lang/rust#57130
[57167]: rust-lang/rust#57167
[57175]: rust-lang/rust#57175
[57234]: rust-lang/rust#57234
[57332]: rust-lang/rust#57332
[57465]: rust-lang/rust#57465
[57532]: rust-lang/rust#57532
[57535]: rust-lang/rust#57535
[57566]: rust-lang/rust#57566
[57615]: rust-lang/rust#57615
[cargo/6484]: rust-lang/cargo#6484
[`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
[`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
[`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
[`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
[`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
[`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
[`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
[`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
[`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
[`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
[`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
[`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
[`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
[platform-support]: https://forge.rust-lang.org/platform-support.htmlPkgsrc changes:
* Bump required rust version to build to 1.32.0.
* Adapt patches to changed file locations.
* Since we now patch some more vendor/ modules, doctor the corresponding
.cargo-checksum.json files accordingly
Upstream changes:
Version 1.33.0 (2019-02-28)
==========================
Language
--------
- [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
`#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
- [Integer patterns such as in a match expression can now be exhaustive.][56362]
E.g. You can have match statement on a `u8` that covers `0..=255` and
you would no longer be required to have a `_ => unreachable!()` case.
- [You can now have multiple patterns in `if let` and `while let`
expressions.][57532] You can do this with the same syntax as a `match`
expression. E.g.
```rust
enum Creature {
Crab(String),
Lobster(String),
Person(String),
}
fn main() {
let state = Creature::Crab("Ferris");
if let Creature::Crab(name) | Creature::Person(name) = state {
println!("This creature's name is: {}", name);
}
}
```
- [You can now have irrefutable `if let` and `while let` patterns.][57535]
Using this feature will by default produce a warning as this behaviour
can be unintuitive. E.g. `if let _ = 5 {}`
- [You can now use `let` bindings, assignments, expression statements,
and irrefutable pattern destructuring in const functions.][57175]
- [You can now call unsafe const functions.][57067] E.g.
```rust
const unsafe fn foo() -> i32 { 5 }
const fn bar() -> i32 {
unsafe { foo() }
}
```
- [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
E.g. `#[cfg_attr(all(), must_use, optimize)]`
- [You can now specify a specific alignment with the `#[repr(packed)]`
attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a
struct with an alignment of 2 bytes and a size of 6 bytes.
- [You can now import an item from a module as an `_`.][56303] This allows you
to import a trait's impls, and not have the name in the namespace. E.g.
```rust
use std::io::Read as _;
// Allowed as there is only one `Read` in the module.
pub trait Read {}
```
- [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
Compiler
--------
- [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
command line argument.][56351]
- [The mininum required LLVM version has been bumped to 6.0.][56642]
- [Added support for the PowerPC64 architecture on FreeBSD.][57615]
- [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
tier 2 support.][57130] Visit the [platform support][platform-support]
page for information on Rust's platform support.
- [Added support for the `thumbv7neon-linux-androideabi` and
`thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
- [Added support for the `x86_64-unknown-uefi` target.][56769]
Libraries
---------
- [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
functions for all numeric types.][57566]
- [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul,
shl, shr}`
are now `const` functions for all numeric types.][57105]
- [The methods `is_positive` and `is_negative` are now `const` functions for
all signed numeric types.][57105]
- [The `get` method for all `NonZero` types is now `const`.][57167]
- [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
`swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
numeric types.][57234]
- [`Ipv4Addr::new` is now a `const` function][57234]
Stabilized APIs
---------------
- [`unix::FileExt::read_exact_at`]
- [`unix::FileExt::write_all_at`]
- [`Option::transpose`]
- [`Result::transpose`]
- [`convert::identity`]
- [`pin::Pin`]
- [`marker::Unpin`]
- [`marker::PhantomPinned`]
- [`Vec::resize_with`]
- [`VecDeque::resize_with`]
- [`Duration::as_millis`]
- [`Duration::as_micros`]
- [`Duration::as_nanos`]
Cargo
-----
- [Cargo should now rebuild a crate if a file was modified during the initial
build.][cargo/6484]
Compatibility Notes
-------------------
- The methods `str::{trim_left, trim_right, trim_left_matches,
trim_right_matches}` are now deprecated in the standard library, and their
usage will now produce a warning. Please use the `str::{trim_start,
trim_end, trim_start_matches, trim_end_matches}` methods instead.
- The `Error::cause` method has been deprecated in favor of `Error::source`
which supports downcasting.
[55982]: rust-lang/rust#55982
[56303]: rust-lang/rust#56303
[56351]: rust-lang/rust#56351
[56362]: rust-lang/rust#56362
[56642]: rust-lang/rust#56642
[56769]: rust-lang/rust#56769
[56805]: rust-lang/rust#56805
[56947]: rust-lang/rust#56947
[57049]: rust-lang/rust#57049
[57067]: rust-lang/rust#57067
[57105]: rust-lang/rust#57105
[57130]: rust-lang/rust#57130
[57167]: rust-lang/rust#57167
[57175]: rust-lang/rust#57175
[57234]: rust-lang/rust#57234
[57332]: rust-lang/rust#57332
[57465]: rust-lang/rust#57465
[57532]: rust-lang/rust#57532
[57535]: rust-lang/rust#57535
[57566]: rust-lang/rust#57566
[57615]: rust-lang/rust#57615
[cargo/6484]: rust-lang/cargo#6484
[`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
[`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
[`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
[`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
[`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
[`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
[`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
[`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
[`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
[`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
[`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
[`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
[`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
[platform-support]: https://forge.rust-lang.org/platform-support.htmlPkgsrc changes:
* Bump required rust version to build to 1.32.0.
* Adapt patches to changed file locations.
* Since we now patch some more vendor/ modules, doctor the corresponding
.cargo-checksum.json files accordingly
Upstream changes:
Version 1.33.0 (2019-02-28)
==========================
Language
--------
- [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
`#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
- [Integer patterns such as in a match expression can now be exhaustive.][56362]
E.g. You can have match statement on a `u8` that covers `0..=255` and
you would no longer be required to have a `_ => unreachable!()` case.
- [You can now have multiple patterns in `if let` and `while let`
expressions.][57532] You can do this with the same syntax as a `match`
expression. E.g.
```rust
enum Creature {
Crab(String),
Lobster(String),
Person(String),
}
fn main() {
let state = Creature::Crab("Ferris");
if let Creature::Crab(name) | Creature::Person(name) = state {
println!("This creature's name is: {}", name);
}
}
```
- [You can now have irrefutable `if let` and `while let` patterns.][57535]
Using this feature will by default produce a warning as this behaviour
can be unintuitive. E.g. `if let _ = 5 {}`
- [You can now use `let` bindings, assignments, expression statements,
and irrefutable pattern destructuring in const functions.][57175]
- [You can now call unsafe const functions.][57067] E.g.
```rust
const unsafe fn foo() -> i32 { 5 }
const fn bar() -> i32 {
unsafe { foo() }
}
```
- [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
E.g. `#[cfg_attr(all(), must_use, optimize)]`
- [You can now specify a specific alignment with the `#[repr(packed)]`
attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a
struct with an alignment of 2 bytes and a size of 6 bytes.
- [You can now import an item from a module as an `_`.][56303] This allows you
to import a trait's impls, and not have the name in the namespace. E.g.
```rust
use std::io::Read as _;
// Allowed as there is only one `Read` in the module.
pub trait Read {}
```
- [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
Compiler
--------
- [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
command line argument.][56351]
- [The mininum required LLVM version has been bumped to 6.0.][56642]
- [Added support for the PowerPC64 architecture on FreeBSD.][57615]
- [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
tier 2 support.][57130] Visit the [platform support][platform-support]
page for information on Rust's platform support.
- [Added support for the `thumbv7neon-linux-androideabi` and
`thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
- [Added support for the `x86_64-unknown-uefi` target.][56769]
Libraries
---------
- [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
functions for all numeric types.][57566]
- [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul,
shl, shr}`
are now `const` functions for all numeric types.][57105]
- [The methods `is_positive` and `is_negative` are now `const` functions for
all signed numeric types.][57105]
- [The `get` method for all `NonZero` types is now `const`.][57167]
- [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
`swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
numeric types.][57234]
- [`Ipv4Addr::new` is now a `const` function][57234]
Stabilized APIs
---------------
- [`unix::FileExt::read_exact_at`]
- [`unix::FileExt::write_all_at`]
- [`Option::transpose`]
- [`Result::transpose`]
- [`convert::identity`]
- [`pin::Pin`]
- [`marker::Unpin`]
- [`marker::PhantomPinned`]
- [`Vec::resize_with`]
- [`VecDeque::resize_with`]
- [`Duration::as_millis`]
- [`Duration::as_micros`]
- [`Duration::as_nanos`]
Cargo
-----
- [Cargo should now rebuild a crate if a file was modified during the initial
build.][cargo/6484]
Compatibility Notes
-------------------
- The methods `str::{trim_left, trim_right, trim_left_matches,
trim_right_matches}` are now deprecated in the standard library, and their
usage will now produce a warning. Please use the `str::{trim_start,
trim_end, trim_start_matches, trim_end_matches}` methods instead.
- The `Error::cause` method has been deprecated in favor of `Error::source`
which supports downcasting.
[55982]: rust-lang/rust#55982
[56303]: rust-lang/rust#56303
[56351]: rust-lang/rust#56351
[56362]: rust-lang/rust#56362
[56642]: rust-lang/rust#56642
[56769]: rust-lang/rust#56769
[56805]: rust-lang/rust#56805
[56947]: rust-lang/rust#56947
[57049]: rust-lang/rust#57049
[57067]: rust-lang/rust#57067
[57105]: rust-lang/rust#57105
[57130]: rust-lang/rust#57130
[57167]: rust-lang/rust#57167
[57175]: rust-lang/rust#57175
[57234]: rust-lang/rust#57234
[57332]: rust-lang/rust#57332
[57465]: rust-lang/rust#57465
[57532]: rust-lang/rust#57532
[57535]: rust-lang/rust#57535
[57566]: rust-lang/rust#57566
[57615]: rust-lang/rust#57615
[cargo/6484]: rust-lang/cargo#6484
[`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
[`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
[`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
[`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
[`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
[`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
[`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
[`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
[`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
[`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
[`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
[`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
[`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
[platform-support]: https://forge.rust-lang.org/platform-support.htmlPkgsrc changes:
* Bump required rust version to build to 1.32.0.
* Adapt patches to changed file locations.
* Since we now patch some more vendor/ modules, doctor the corresponding
.cargo-checksum.json files accordingly
Upstream changes:
Version 1.33.0 (2019-02-28)
==========================
Language
--------
- [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
`#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
- [Integer patterns such as in a match expression can now be exhaustive.][56362]
E.g. You can have match statement on a `u8` that covers `0..=255` and
you would no longer be required to have a `_ => unreachable!()` case.
- [You can now have multiple patterns in `if let` and `while let`
expressions.][57532] You can do this with the same syntax as a `match`
expression. E.g.
```rust
enum Creature {
Crab(String),
Lobster(String),
Person(String),
}
fn main() {
let state = Creature::Crab("Ferris");
if let Creature::Crab(name) | Creature::Person(name) = state {
println!("This creature's name is: {}", name);
}
}
```
- [You can now have irrefutable `if let` and `while let` patterns.][57535]
Using this feature will by default produce a warning as this behaviour
can be unintuitive. E.g. `if let _ = 5 {}`
- [You can now use `let` bindings, assignments, expression statements,
and irrefutable pattern destructuring in const functions.][57175]
- [You can now call unsafe const functions.][57067] E.g.
```rust
const unsafe fn foo() -> i32 { 5 }
const fn bar() -> i32 {
unsafe { foo() }
}
```
- [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
E.g. `#[cfg_attr(all(), must_use, optimize)]`
- [You can now specify a specific alignment with the `#[repr(packed)]`
attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a
struct with an alignment of 2 bytes and a size of 6 bytes.
- [You can now import an item from a module as an `_`.][56303] This allows you
to import a trait's impls, and not have the name in the namespace. E.g.
```rust
use std::io::Read as _;
// Allowed as there is only one `Read` in the module.
pub trait Read {}
```
- [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
Compiler
--------
- [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
command line argument.][56351]
- [The mininum required LLVM version has been bumped to 6.0.][56642]
- [Added support for the PowerPC64 architecture on FreeBSD.][57615]
- [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
tier 2 support.][57130] Visit the [platform support][platform-support]
page for information on Rust's platform support.
- [Added support for the `thumbv7neon-linux-androideabi` and
`thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
- [Added support for the `x86_64-unknown-uefi` target.][56769]
Libraries
---------
- [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
functions for all numeric types.][57566]
- [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul,
shl, shr}`
are now `const` functions for all numeric types.][57105]
- [The methods `is_positive` and `is_negative` are now `const` functions for
all signed numeric types.][57105]
- [The `get` method for all `NonZero` types is now `const`.][57167]
- [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
`swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
numeric types.][57234]
- [`Ipv4Addr::new` is now a `const` function][57234]
Stabilized APIs
---------------
- [`unix::FileExt::read_exact_at`]
- [`unix::FileExt::write_all_at`]
- [`Option::transpose`]
- [`Result::transpose`]
- [`convert::identity`]
- [`pin::Pin`]
- [`marker::Unpin`]
- [`marker::PhantomPinned`]
- [`Vec::resize_with`]
- [`VecDeque::resize_with`]
- [`Duration::as_millis`]
- [`Duration::as_micros`]
- [`Duration::as_nanos`]
Cargo
-----
- [Cargo should now rebuild a crate if a file was modified during the initial
build.][cargo/6484]
Compatibility Notes
-------------------
- The methods `str::{trim_left, trim_right, trim_left_matches,
trim_right_matches}` are now deprecated in the standard library, and their
usage will now produce a warning. Please use the `str::{trim_start,
trim_end, trim_start_matches, trim_end_matches}` methods instead.
- The `Error::cause` method has been deprecated in favor of `Error::source`
which supports downcasting.
[55982]: rust-lang/rust#55982
[56303]: rust-lang/rust#56303
[56351]: rust-lang/rust#56351
[56362]: rust-lang/rust#56362
[56642]: rust-lang/rust#56642
[56769]: rust-lang/rust#56769
[56805]: rust-lang/rust#56805
[56947]: rust-lang/rust#56947
[57049]: rust-lang/rust#57049
[57067]: rust-lang/rust#57067
[57105]: rust-lang/rust#57105
[57130]: rust-lang/rust#57130
[57167]: rust-lang/rust#57167
[57175]: rust-lang/rust#57175
[57234]: rust-lang/rust#57234
[57332]: rust-lang/rust#57332
[57465]: rust-lang/rust#57465
[57532]: rust-lang/rust#57532
[57535]: rust-lang/rust#57535
[57566]: rust-lang/rust#57566
[57615]: rust-lang/rust#57615
[cargo/6484]: rust-lang/cargo#6484
[`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
[`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
[`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
[`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
[`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
[`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
[`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
[`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
[`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
[`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
[`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
[`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
[`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
[platform-support]: https://forge.rust-lang.org/platform-support.html
Edit: This was merged in #56557. This now just contains a fix for 16-bit pointer sizes.
This is dependent on the FCP for rust-lang/rfcs#2591 being completed, but that should happen tomorrow, so there's little harm in opening this PR early.
Closes#50907.