Allow #[must_use] on traits #55663

varkor · 2018-11-03T20:27:28Z

Addresses #55506, but we'll probably want to add it to some library traits like Iterator before the issue is considered fixed. Fixes #51560.

#[must_use] is already permitted on traits, with no effect, so this seems like a bug fix, but I might be overlooking something. This currently warns for impl Trait or dyn Trait when the Trait is #[must_use] (although I don't think the latter is currently possible, so it's simply future-proofed).

rust-highfive · 2018-11-03T20:27:39Z

r? @nikomatsakis

(rust_highfive has picked a reviewer for you, use r? to override)

TimNN · 2018-11-13T18:38:17Z

Ping from triage @nikomatsakis / @rust-lang/compiler: This PR requires your review.

estebank · 2018-11-15T19:12:24Z

@bors r+

bors · 2018-11-15T19:12:25Z

📌 Commit 17020e711ce0a634f98122370917943947e66777 has been approved by estebank

pietroalbini · 2018-11-15T22:48:22Z

@bors r-

This caused a failure in the rollup:

[00:20:51] error[E0507]: cannot move out of an `Rc`
[00:20:51]   --> librustc_lint/unused.rs:71:43
[00:20:51]    |
[00:20:51] 71 |                     for (predicate, _) in cx.tcx.predicates_of(def).predicates {
[00:20:51]    |                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot move out of an `Rc`
[00:20:52] error: aborting due to previous error

varkor · 2018-11-19T17:41:44Z

@bors r=estebank

bors · 2018-11-19T17:41:45Z

📌 Commit 0ab70fa has been approved by estebank

varkor · 2018-11-19T18:55:40Z

Forgot to push...

@bors r=estebank

bors · 2018-11-19T18:55:41Z

📌 Commit 737dec0 has been approved by estebank

bors · 2018-11-20T06:46:34Z

⌛ Testing commit 737dec0 with merge d0c9930a43bbdda941c819cfafe166e8908b2828...

bors · 2018-11-20T07:24:15Z

💔 Test failed - status-travis

rust-highfive · 2018-11-20T07:24:16Z

The job dist-mips64el-linux of your PR failed on Travis (raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

Click to expand the log.

[00:04:49] [RUSTC-TIMING] rustc_rayon_core test:false 2.026
[00:04:49]    Compiling rustc-rayon v0.1.1
[00:04:52] [RUSTC-TIMING] rustc_rayon test:false 2.867
[00:04:52]    Compiling rustc_data_structures v0.0.0 (/checkout/src/librustc_data_structures)
No output has been received in the last 30m0s, this potentially indicates a stalled build or something wrong with the build itself.
Check the details on how to adjust your build configuration on: https://docs.travis-ci.com/user/common-build-problems/#Build-times-out-because-no-output-was-received
The build has been terminated

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 @TimNN. (Feature Requests)

pietroalbini · 2018-11-20T08:42:34Z

@bors retry (30min timeout)

bors · 2018-11-20T15:16:01Z

⌛ Testing commit 737dec0 with merge 3991bfb...

Allow #[must_use] on traits Addresses #55506, but we'll probably want to add it to some library traits like `Iterator` before the issue is considered fixed. Fixes #51560. `#[must_use]` is already permitted on traits, with no effect, so this seems like a bug fix, but I might be overlooking something. This currently warns for `impl Trait` or `dyn Trait` when the `Trait` is `#[must_use]` (although I don't think the latter is currently possible, so it's simply future-proofed).

bors · 2018-11-20T18:08:05Z

☀️ Test successful - status-appveyor, status-travis
Approved by: estebank
Pushing 3991bfb to master...

Changelog: Version 1.32.0 (2019-01-17) ========================== Language -------- #### 2018 edition - [You can now use the `?` operator in macro definitions.][56245] The `?` operator allows you to specify zero or one repetitions similar to the `*` and `+` operators. - [Module paths with no leading keyword like `super`, `self`, or `crate`, will now always resolve to the item (`enum`, `struct`, etc.) available in the module if present, before resolving to a external crate or an item the prelude.][56759] E.g. ```rust enum Color { Red, Green, Blue } use Color::*; ``` #### All editions - [You can now match against `PhantomData<T>` types.][55837] - [You can now match against literals in macros with the `literal` specifier.][56072] This will match against a literal of any type. E.g. `1`, `'A'`, `"Hello World"` - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g. ```rust struct Point(i32, i32); impl Point { pub fn new(x: i32, y: i32) -> Self { Self(x, y) } pub fn is_origin(&self) -> bool { match self { Self(0, 0) => true, _ => false, } } } ``` - [Self can also now be used in type definitions.][56366] E.g. ```rust enum List<T> where Self: PartialOrd<Self> // can write `Self` instead of `List<T>` { Nil, Cons(T, Box<Self>) // likewise here } ``` - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if a `impl Trait` or `dyn Trait` is returned and unused in the program. Compiler -------- - [The default allocator has changed from jemalloc to the default allocator on your system.][55238] The compiler itself on Linux & macOS will still use jemalloc, but programs compiled with it will use the system allocator. - [Added the `aarch64-pc-windows-msvc` target.][55702] Libraries --------- - [`PathBuf` now implements `FromStr`.][55148] - [`Box<[T]>` now implements `FromIterator<T>`.][55843] - [The `dbg!` macro has been stabilized.][56395] This macro enables you to easily debug expressions in your rust program. E.g. ```rust let a = 2; let b = dbg!(a * 2) + 1; // ^-- prints: [src/main.rs:4] a * 2 = 4 assert_eq!(b, 5); ``` The following APIs are now `const` functions and can be used in a `const` context. - [`Cell::as_ptr`] - [`UnsafeCell::get`] - [`char::is_ascii`] - [`iter::empty`] - [`ManuallyDrop::new`] - [`ManuallyDrop::into_inner`] - [`RangeInclusive::start`] - [`RangeInclusive::end`] - [`NonNull::as_ptr`] - [`slice::as_ptr`] - [`str::as_ptr`] - [`Duration::as_secs`] - [`Duration::subsec_millis`] - [`Duration::subsec_micros`] - [`Duration::subsec_nanos`] - [`CStr::as_ptr`] - [`Ipv4Addr::is_unspecified`] - [`Ipv6Addr::new`] - [`Ipv6Addr::octets`] Stabilized APIs --------------- - [`i8::to_be_bytes`] - [`i8::to_le_bytes`] - [`i8::to_ne_bytes`] - [`i8::from_be_bytes`] - [`i8::from_le_bytes`] - [`i8::from_ne_bytes`] - [`i16::to_be_bytes`] - [`i16::to_le_bytes`] - [`i16::to_ne_bytes`] - [`i16::from_be_bytes`] - [`i16::from_le_bytes`] - [`i16::from_ne_bytes`] - [`i32::to_be_bytes`] - [`i32::to_le_bytes`] - [`i32::to_ne_bytes`] - [`i32::from_be_bytes`] - [`i32::from_le_bytes`] - [`i32::from_ne_bytes`] - [`i64::to_be_bytes`] - [`i64::to_le_bytes`] - [`i64::to_ne_bytes`] - [`i64::from_be_bytes`] - [`i64::from_le_bytes`] - [`i64::from_ne_bytes`] - [`i128::to_be_bytes`] - [`i128::to_le_bytes`] - [`i128::to_ne_bytes`] - [`i128::from_be_bytes`] - [`i128::from_le_bytes`] - [`i128::from_ne_bytes`] - [`isize::to_be_bytes`] - [`isize::to_le_bytes`] - [`isize::to_ne_bytes`] - [`isize::from_be_bytes`] - [`isize::from_le_bytes`] - [`isize::from_ne_bytes`] - [`u8::to_be_bytes`] - [`u8::to_le_bytes`] - [`u8::to_ne_bytes`] - [`u8::from_be_bytes`] - [`u8::from_le_bytes`] - [`u8::from_ne_bytes`] - [`u16::to_be_bytes`] - [`u16::to_le_bytes`] - [`u16::to_ne_bytes`] - [`u16::from_be_bytes`] - [`u16::from_le_bytes`] - [`u16::from_ne_bytes`] - [`u32::to_be_bytes`] - [`u32::to_le_bytes`] - [`u32::to_ne_bytes`] - [`u32::from_be_bytes`] - [`u32::from_le_bytes`] - [`u32::from_ne_bytes`] - [`u64::to_be_bytes`] - [`u64::to_le_bytes`] - [`u64::to_ne_bytes`] - [`u64::from_be_bytes`] - [`u64::from_le_bytes`] - [`u64::from_ne_bytes`] - [`u128::to_be_bytes`] - [`u128::to_le_bytes`] - [`u128::to_ne_bytes`] - [`u128::from_be_bytes`] - [`u128::from_le_bytes`] - [`u128::from_ne_bytes`] - [`usize::to_be_bytes`] - [`usize::to_le_bytes`] - [`usize::to_ne_bytes`] - [`usize::from_be_bytes`] - [`usize::from_le_bytes`] - [`usize::from_ne_bytes`] Cargo ----- - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218] - [Usernames are now allowed in alt registry URLs.][cargo/6242] Misc ---- - [`libproc_macro` has been added to the `rust-src` distribution.][55280] Compatibility Notes ------------------- - [The argument types for AVX's `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have been changed from `*const` to `*mut` as the previous implementation was unsound. [55148]: rust-lang/rust#55148 [55238]: rust-lang/rust#55238 [55280]: rust-lang/rust#55280 [55610]: rust-lang/rust#55610 [55663]: rust-lang/rust#55663 [55702]: https://github.com/rust-lag/rust/pull/55702/ [55837]: rust-lang/rust#55837 [55843]: rust-lang/rust#55843 [56072]: rust-lang/rust#56072 [56245]: rust-lang/rust#56245 [56365]: https:/ttps://github.com/rust-lang/rust/pull/56395/ [56759]: rust-lang/rust#56759 [cargo/6218]: rust-lang/cargo#6218 [cargo/6242]: rust-lang/cargo#6242 [`CStr::as_ptr`]: https://doc.rust-`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros [`Duration::subsec_millis`]: https://doc.rust-lang.org/sct.Duration.html#method.subsec_nanos [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new [`Ipv6Addr::octets`]: httpw`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes

@Nemo157

…tril Extend the #[must_use] lint to boxed types Fixes rust-lang#55506 (comment) (cc @Nemo157). This should have been included as part of rust-lang#55663, but was overlooked.

@Nemo157

…tril Extend the #[must_use] lint to boxed types Fixes rust-lang#55506 (comment) (cc @Nemo157). This should have been included as part of rust-lang#55663, but was overlooked.

rust-highfive assigned nikomatsakis Nov 3, 2018

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pietroalbini mentioned this pull request Nov 15, 2018

Rollup of 15 pull requests #55990

Closed

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varkor added 5 commits November 19, 2018 17:41

Use general uninhabitedness checking

b55717f

Recognise #[must_use] on traits, affecting impl Trait

cb5520b

Test for #[must_use] on traits

1228868

Handle trait objects

9178eb4

Fix typo in #[must_use] message

0ab70fa

varkor force-pushed the must_use-traits branch from 17020e7 to 0ab70fa Compare November 19, 2018 17:41

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Fix change to predicates

737dec0

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bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Nov 20, 2018

bors merged commit 737dec0 into rust-lang:master Nov 20, 2018

varkor deleted the must_use-traits branch November 20, 2018 18:26

varkor mentioned this pull request Nov 20, 2018

#[must_use] on traits, e.g. on Future #55506

Closed

kennytm mentioned this pull request Nov 20, 2018

Spurious 30 minutes timeout on Travis CI #56112

Closed

Havvy added the relnotes Marks issues that should be documented in the release notes of the next release. label Nov 28, 2018

Nemo157 mentioned this pull request Feb 3, 2019

RFC: stabilize std::task and std::future::Future rust-lang/rfcs#2592

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5 tasks

Centril mentioned this pull request Mar 16, 2019

Reorg and update attributes rust-lang/reference#537

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Centril added this to the 1.32 milestone Apr 26, 2019

varkor mentioned this pull request Jun 29, 2019

Extend the #[must_use] lint to boxed types #62228

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Allow #[must_use] on traits #55663

Allow #[must_use] on traits #55663

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