Prior to 1.12.0 we dropped both `_x` and `_y` before the rest of their
respective parameters, since then we dropped `_x` and `_y` after. The
original order appears to be the correct order, as the value created
later is dropped first, so we revert to that order and add a test for
it.
While this is technically a breaking change, I can't work out how
anyone could be relying on this without making their code very
brittle. If this is considered to be too likely to break real world code
then I can revert the change and change the test to check for the
current order.
bors [Tue, 15 Jan 2019 04:06:25 +0000 (04:06 +0000)]
Auto merge of #57130 - VardhanThigle:Vardhan/x86_64-fortanix-unknown-sgx-tier2_support, r=alexcrichton
Upgrade x86_64-fortanix-unknown-sgx platform support to tier 2
## Overview
1. This PR upgrades x86_64-fortanix-unknown-sgx platform support to tier 2 (std only) by setting up build automation for this target.
1. For supporting unwinding, this target needs to link to a port of LLVM's libunwind (more details could be found in #56979), which will be distributed along with the Rust binaries (similar to the extra musl objects)
### Building and copying libunwind:
We have added a new build script (`build-x86_64-fortanix-unknown-sgx-toolchain.sh`) that will run while the container is built. This will build `libunwind.a` from git source.
While the container is built, the persistent volumes where obj/ gets created aren't yet mapped. As a workaround, we copy the built `libunwind.a` to `obj/build/x86_64-unknown-linux-gnu/stage2/lib/rustlib/x86_64-fortanix-unknown-sgx/lib/` after x.py runs.
If any reviewer knows of a better solution, please do tell.
bors [Mon, 14 Jan 2019 23:00:50 +0000 (23:00 +0000)]
Auto merge of #57607 - Centril:rollup, r=Centril
Rollup of 8 pull requests
Successful merges:
- #57043 (Fix poor worst case performance of set intersection)
- #57480 (Clean up and fix a bug in query plumbing)
- #57481 (provide suggestion for invalid boolean cast)
- #57540 (Modify some parser diagnostics to continue evaluating beyond the parser)
- #57570 (Querify local `plugin_registrar_fn` and `proc_macro_decls_static`)
- #57572 (Unaccept `extern_in_paths`)
- #57585 (Recover from item trailing semicolon)
- #57589 (Add a debug_assert to Vec::set_len)
Rollup merge of #57572 - Centril:unaccept-extern-in-path, r=petrochenkov
Unaccept `extern_in_paths`
Based on completed fcp-close in https://github.com/rust-lang/rust/issues/55600, this removes `extern_in_path` (e.g. `extern::foo::bar`) from the language. The changes are primarily reversing https://github.com/rust-lang/rust/commit/32db83b16e06cb5cca72d0e6a648a8008eda0fac.
Rollup merge of #57570 - Xanewok:querify-some, r=Zoxc
Querify local `plugin_registrar_fn` and `proc_macro_decls_static`
Instead of calculating them as part of the `Session`, we do that in the query system.
It's also nice that these queries are already defined for external crates - here, we provide the queries for the local crate.
Rollup merge of #57540 - estebank:eval-more, r=petrochenkov
Modify some parser diagnostics to continue evaluating beyond the parser
Continue evaluating further errors after parser errors on:
- trailing type argument attribute
- lifetime in incorrect location
- incorrect binary literal
- missing `for` in `impl Trait for Foo`
- type argument in `where` clause
- incorrect float literal
- incorrect `..` in pattern
- associated types
- incorrect discriminator value variant error
and others. All of these were found by making `continue-parse-after-error` `true` by default to identify errors that would need few changes. There are now only a handful of errors that have any change with `continue-parse-after-error` enabled.
These changes make it so `rust` _won't_ stop evaluation after finishing parsing, enabling type checking errors to be displayed on the existing code without having to fix the parse errors.
Each commit has an individual diagnostic change with their corresponding tests.
Rollup merge of #57043 - ssomers:master, r=alexcrichton
Fix poor worst case performance of set intersection
Specifically, intersection of asymmetrically sized sets when the large set is on the left. See also the [latest answer on stackoverflow](https://stackoverflow.com/questions/35439376/python-set-intersection-is-faster-then-rust-hashset-intersection).
Also applied to the union member, where the effect is much less but still measurable.
Formatted the changed code only, does not increase the error count reported by tidy check, and tried to adhere to the spirit of the unit tests.
bors [Mon, 14 Jan 2019 18:25:46 +0000 (18:25 +0000)]
Auto merge of #57559 - ehuss:update-cargo, r=alexcrichton
Update cargo
13 commits in 34320d212dca8cd27d06ce93c16c6151f46fcf2e..2b4a5f1f0bb6e13759e88ea9512527b0beba154f
2019-01-03 19:12:38 +0000 to 2019-01-12 04:13:12 +0000
- Add test for publish with [patch] + cleanup. (rust-lang/cargo#6544)
- Fix clippy warning (rust-lang/cargo#6546)
- Revert "Workaround by using yesterday's nightly" (rust-lang/cargo#6540)
- Adding feature-flags to `cargo publish` and `cargo package` (rust-lang/cargo#6453)
- Fix the Travis CI badge (rust-lang/cargo#6530)
- Add helpful text for Windows exceptions like Unix (rust-lang/cargo#6532)
- Report fix bugs to Rust instead of Cargo (rust-lang/cargo#6531)
- --{example,bin,bench,test} with no argument now lists all available targets (rust-lang/cargo#6505)
- Rebuild on mid build file modification (rust-lang/cargo#6484)
- Derive Clone for TomlDependency (rust-lang/cargo#6527)
- publish: rework the crates.io detection logic. (rust-lang/cargo#6525)
- avoid duplicates in ignore files (rust-lang/cargo#6521)
- Rustflags in metadata (rust-lang/cargo#6503)
bors [Mon, 14 Jan 2019 13:03:24 +0000 (13:03 +0000)]
Auto merge of #57592 - Centril:rollup, r=Centril
Rollup of 6 pull requests
Successful merges:
- #57232 (Parallelize and optimize parts of HIR map creation)
- #57418 (MetadataOnlyCodegenBackend: run the collector only once)
- #57465 (Stabilize cfg_target_vendor)
- #57477 (clarify resolve typo suggestion)
- #57556 (privacy: Fix private-in-public check for existential types)
- #57584 (Remove the `connect_timeout_unroutable` test.)
Rollup merge of #57465 - jethrogb:jb/stablize-cfg-target-vendor, r=joshtriplett,Centril
Stabilize cfg_target_vendor
This stabilizes the use of `cfg(target_vendor = "...")` and removes the corresponding `cfg_target_vendor` feature. Other unstable cfgs remain behind their existing feature gates.
This functionality was added back in 2015 in #28612 to complete the coverage of target tuples (`<arch><sub>-<vendor>-<os>-<env>`). [RFC 131](https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md) governs the target specification, not including `target_vendor` seems to have just been an oversight. `target_os`, `target_family`, and `target_arch` are stable as of 1.0.0. `target_env` was also not mentioned in RFC 131, was added in #24777, never behind a feature_gate, and insta-stable at 1.1.0.
The functionality is tested in [test/run-pass/cfg/cfg-target-vendor.rs](https://github.com/rust-lang/rust/blob/master/src/test/run-pass/cfg/cfg-target-vendor.rs).
bors [Mon, 14 Jan 2019 06:35:51 +0000 (06:35 +0000)]
Auto merge of #57387 - euclio:nonstandard-style-suggestions, r=oli-obk
Use structured suggestions for nonstandard style lints
This PR modifies the lints in the nonstandard_style group to use structured suggestions. Note that there's a bit of tricky span calculation going on for the `crate_name` attribute. It also simplifies the code a bit: I don't think the "fallback" suggestions for these lints can actually be triggered.
bors [Mon, 14 Jan 2019 03:49:25 +0000 (03:49 +0000)]
Auto merge of #57381 - estebank:if-else-308, r=nikomatsakis
Tweak output of type mismatch between "then" and `else` `if` arms
```
error[E0308]: if and else have incompatible types
--> $DIR/if-else-type-mismatch.rs:5:9
|
LL | let _ = if true {
| _____________-
LL | | 42i32
| | ----- expected because of this
LL | | } else {
LL | | 42u32
| | ^^^^^ expected i32, found u32
LL | | };
| |_____- if and else have incompatible types
|
= note: expected type `i32`
found type `u32`
error[E0308]: if and else have incompatible types
--> file.rs:2:38
|
LL | let _ = if false { 3u8; } else { 3u8 };
| ---- ^^^ expected (), found u8
| | |
| | help: consider removing this semicolon
| expected because of this
|
= note: expected type `()`
found type `u8`
error[E0308]: if and else have incompatible types
--> file.rs:3:37
|
LL | let _ = if false { 3u8 } else { 3u8; };
| --- ^^^-
| | | |
| | | help: consider removing this semicolon
| | expected u8, found ()
| expected because of this
|
= note: expected type `u8`
found type `()`
error[E0308]: if and else have incompatible types
--> file.rs:4:37
|
LL | let _ = if false { 3i8 } else { 3u8 };
| --- ^^^ expected i8, found u8
| |
| expected because of this
|
= note: expected type `i8`
found type `u8`
```
bors [Mon, 14 Jan 2019 00:59:54 +0000 (00:59 +0000)]
Auto merge of #56954 - hug-dev:armv8m-main-ci, r=alexcrichton
Add dist builder for Armv8-M Mainline
This commit adds the Armv8-M Mainline target in the list of targets that
get their dist components built. It also update the build-manifest so
that this target gets also its dist components uploaded.
I took example on other pull requests doing the same thing for another target to make the changes. Please feel free to comment if things needs to be added or removed.
Doing `./x.py dist --target thumbv8m.main-none-eabi` worked locally so I assume that this will also work on the CI.
It will (I think) however need a new release of alexcrichton/cc-rs to include the pull request alexcrichton/cc-rs#363 @alexcrichton
I hope to do the HardFloat version (`thumbv8m.main-none-eabihf`) and Baseline (`thumbv8m.base-none-eabi`) later, as fixes need to be done on compiler-builtins first to support those.
bors [Sun, 13 Jan 2019 22:20:43 +0000 (22:20 +0000)]
Auto merge of #57580 - Centril:rollup, r=Centril
Rollup of 4 pull requests
Successful merges:
- #56874 (Simplify foreign type rendering.)
- #57113 (Move diagnostics out from QueryJob and optimize for the case with no diagnostics)
- #57366 (Point at match discriminant on type error in match arm pattern)
- #57538 (librustc_mir: Fix ICE with slice patterns)
Failed merges:
- #57381 (Tweak output of type mismatch between "then" and `else` `if` arms)
Rollup merge of #57538 - dlrobertson:fix_57472, r=zackmdavis
librustc_mir: Fix ICE with slice patterns
If a match arm does not include all fields in a structure and a later
pattern includes a field that is an array, we will attempt to use the
array type from the prior arm. When calculating the field type, treat
a array of an unknown size as a `TyErr`.
Rollup merge of #57366 - estebank:point-match-discrim, r=varkor
Point at match discriminant on type error in match arm pattern
```
error[E0308]: mismatched types
--> src/main.rs:5:9
|
4 | let temp: usize = match a + b {
| ----- this expression has type `usize`
5 | Ok(num) => num,
| ^^^^^^^ expected usize, found enum `std::result::Result`
|
= note: expected type `usize`
found type `std::result::Result<_, _>`
```
Fix #57279.
Rollup merge of #56874 - JohnHeitmann:docs-spacing, r=GuillaumeGomez
Simplify foreign type rendering.
Simplified foreign type rendering by switching from tables to flexbox. Also, removed some seemingly extraneous elements like “ghost” spans.
Reduces element count on the `std::iter::Iterator` page by 30%. On my laptop it drops Iterator page load time from ~15s to ~10s. Frame times during scrolling are a hair lower too.
Known visual changes (happy to tweak based on feedback):
* The main `impl ...` headers are now getting the default, larger, h3 font size. This was an accident, but I liked how it turned out so I didn't fix it.
* There's a hair less vertical spacing between the end of a where block and the start of the next fn. Now, all spacing is consistent. I think this looks a bit worse. I may tweak vertical spacing more here or in a follow-up that cleans up vertical spacing more broadly.
* "[src]" links are all sized at 17px. A few were 19px in the original.
I haven't yet done heavy cross-browser or cross-crate testing. I was hoping to get a quick thumbs up or thumbs down here at this first draft, then if this is on the right track I'll spend some time on that testing.
TODO:
- [x] Test on Chrome
- [x] Test on Firefox
- [ ] ~~Test on UC Android~~
- [x] Test on Edge
- [x] Test on iOS safari
- [x] Test on desktop safari
- [x] Update automated tests
- [x] Increase vertical margin
- [x] Fix "Important traits for" hover overlap
- [x] Wait for #55798 to land & merge it
bors [Sun, 13 Jan 2019 17:08:24 +0000 (17:08 +0000)]
Auto merge of #57577 - Centril:rollup, r=Centril
Rollup of 4 pull requests
Successful merges:
- #57004 (Make `TokenStream` less recursive.)
- #57102 (NLL: Add union justifications to conflicting borrows.)
- #57337 (rustc: Place wasm linker args first instead of last)
- #57549 (Add #[must_use] message to Iterator and Future)
Rollup merge of #57549 - taiki-e:must_use, r=estebank
Add #[must_use] message to Iterator and Future
~~Iterator's message is based on current iterator adaptor's #[must_use] message (added in #15561) and https://github.com/rust-lang/rust/pull/56677/files#r241236020~~
Future's message is the same as those used in [futures-rs](https://github.com/rust-lang-nursery/futures-rs/search?q=must_use&unscoped_q=must_use) and [tokio](https://github.com/tokio-rs/tokio/search?q=must_use&unscoped_q=must_use).
Rollup merge of #57337 - alexcrichton:prioritize-another, r=fitzgen
rustc: Place wasm linker args first instead of last
This ensures that arguments passed via `-C link-arg` can override the
first ones on the command line, for example allowing configuring of the
stack size.
Rollup merge of #57004 - nnethercote:TS-change-Stream, r=petrochenkov
Make `TokenStream` less recursive.
`TokenStream` is currently recursive in *two* ways:
- the `TokenTree` variant contains a `ThinTokenStream`, which can
contain a `TokenStream`;
- the `TokenStream` variant contains a `Vec<TokenStream>`.
The latter is not necessary and causes significant complexity. This
commit replaces it with the simpler `Vec<(TokenTree, IsJoint)>`.
This reduces complexity significantly. In particular, `StreamCursor` is
eliminated, and `Cursor` becomes much simpler, consisting now of just a
`TokenStream` and an index.
The commit also removes the `Extend` impl for `TokenStream`, because it
is only used in tests. (The commit also removes those tests.)
Overall, the commit reduces the number of lines of code by almost 200.
Dan Robertson [Sun, 13 Jan 2019 14:23:32 +0000 (14:23 +0000)]
librustc_mir: Fix ICE with slice patterns
If a match arm does not include all fields in a structure and a later
pattern includes a field that is an array, we will attempt to use the
array type from the prior arm. When calculating the field type, treat
a array of an unknown size as a TyErr.
bors [Sun, 13 Jan 2019 11:54:02 +0000 (11:54 +0000)]
Auto merge of #57568 - Centril:rollup, r=Centril
Rollup of 16 pull requests
Successful merges:
- #57351 (Don't actually create a full MIR stack frame when not needed)
- #57353 (Optimise floating point `is_finite` (2x) and `is_infinite` (1.6x).)
- #57412 (Improve the wording)
- #57436 (save-analysis: use a fallback when access levels couldn't be computed)
- #57453 (lldb_batchmode.py: try `import _thread` for Python 3)
- #57454 (Some cleanups for core::fmt)
- #57461 (Change `String` to `&'static str` in `ParseResult::Failure`.)
- #57473 (std: Render large exit codes as hex on Windows)
- #57474 (save-analysis: Get path def from parent in case there's no def for the path itself.)
- #57494 (Speed up item_bodies for large match statements involving regions)
- #57496 (re-do docs for core::cmp)
- #57508 (rustdoc: Allow inlining of reexported crates and crate items)
- #57547 (Use `ptr::eq` where applicable)
- #57557 (resolve: Mark extern crate items as used in more cases)
- #57560 (hygiene: Do not treat `Self` ctor as a local variable)
- #57564 (Update the const fn tracking issue to the new metabug)
Rollup merge of #57564 - varkor:update-const_fn-tracking-issue, r=Centril
Update the const fn tracking issue to the new metabug
The new `const fn` tracking issue is #57563. We don't want to point to a closed issue in the diagnostics (or FIXMEs), so these have been updated (from the old issue, #24111).
Rollup merge of #57547 - Xanewok:ptr-eq, r=petrochenkov
Use `ptr::eq` where applicable
Stumbled upon a few of `A as *const _ as usize == B as *const as usize`, so I decided to follow the programming boy scout rule (:smile:) and replaced the pattern with more widely used `ptr::eq`.
Rollup merge of #57508 - DebugSteven:inline-extern, r=GuillaumeGomez
rustdoc: Allow inlining of reexported crates and crate items
Fixes #46296
This PR checks for when a `pub extern crate` statement has a `#[doc(inline)]` attribute & inlines its contents. Code is based off of the inlining statements for `pub use` statements.
Rollup merge of #57494 - dotdash:expand, r=nikomatsakis
Speed up item_bodies for large match statements involving regions
These changes don't change anything about the complexity of the algorithms, but use some easy shortcuts or modifications to cut down some overhead.
The first change, which incrementally removes the constraints from the set we're iterating over probably introduces some overhead for small to medium sized constraint sets, but it's not big enough for me to observe it in any project I tested against (not that many though).
Though most other crates probably won't improve much at all, because huge matches aren't that common, the changes seemed simple enough for me to make them.
We have the right ID when looking for NodeId(31) and try with NodeId(32) (which
is the right thing to look for) from get_path_data. But not when we look from `write_sub_paths_truncated`
Basically process_path takes an id which is always the parent, and that we
fall back to in get_path_data(), so we get the right result for the last path
segment, but not for the other segments that get written to from
write_sub_paths_truncated.
I think we can stop passing the explicit `id` around to get_path_data as a followup.
Rollup merge of #57473 - alexcrichton:hex-display-on-windows, r=Kimundi
std: Render large exit codes as hex on Windows
On Windows process exit codes are never signals but rather always 32-bit
integers. Most faults like segfaults and such end up having large
integers used to represent them, like STATUS_ACCESS_VIOLATION being
0xC0000005. Currently, however, when an `ExitStatus` is printed this
ends up getting rendered as 3221225477 which is somewhat more difficult
to debug.
This commit adds a branch in `Display for ExitStatus` on Windows which
handles exit statuses where the high bit is set and prints those exit
statuses as hex instead of with decimals. This will hopefully preserve
the current display for small exit statuses (like `exit code: 22`), but
assist in quickly debugging segfaults/access violations/etc. I've
found at least that the hex codes are easier to search for than decimal.
I wasn't able to find any official documentation saying that all system
exit codes have the high bit set, but I figure it's a good enough
heuristic for now.
Rollup merge of #57436 - Xanewok:save-analysis-access-ice-fix, r=nikomatsakis
save-analysis: use a fallback when access levels couldn't be computed
Fixing an RLS regression I introduced in https://github.com/rust-lang/rust/pull/57343 :cry:
I missed a case where we get [called back with analysis when type checking fails](https://github.com/rust-lang/rust/blob/9d54812829e9d92dac35a4a0f358cdc5a2475371/src/librustc_driver/driver.rs#L1264). Since privacy checking normally is done afterwards, when we execute the `privacy_access_levels` query inside the save_analysis callback we'll calculate it for the first time and since typeck info isn't complete, we'll crash there.
Double-checked locally and it seems to have fixed the problem.
Rollup merge of #57353 - huonw:faster-finiteness-checks, r=KodrAus
Optimise floating point `is_finite` (2x) and `is_infinite` (1.6x).
These can both rely on IEEE754 semantics to be made faster, by folding
away the sign with an abs (left private for now), and then comparing
to infinity, letting the NaN semantics of a direct float comparison
handle NaN input properly.
The `abs` bit-fiddling is simple (a single and), and so these new
forms compile down to a few instructions, without branches, e.g. for
f32:
When used in loops/repeatedly, they get even better: the memory
operations (loading the mask 0x7FFFFFFF for abs, and infinity
0x7F80_0000) are likely to be hoisted out of the individual calls, to
be shared, and the `seta`/`setae` are likely to be collapsed into
conditional jumps or moves (or similar).
The old `is_infinite` did two comparisons, and the old `is_finite` did
three (with a branch), and both of them had to check the flags after
every one of those comparison. These functions have had that old
implementation since they were added in
https://github.com/rust-lang/rust/commit/6284190ef9918e05cb9147a2a81100ddcb06fea8
7 years ago.
Benchmark (`abs` is the new form, `std` is the old):
```
test f32_is_finite_abs ... bench: 55 ns/iter (+/- 10)
test f32_is_finite_std ... bench: 118 ns/iter (+/- 5)
test f32_is_infinite_abs ... bench: 53 ns/iter (+/- 1)
test f32_is_infinite_std ... bench: 84 ns/iter (+/- 6)
test f64_is_finite_abs ... bench: 52 ns/iter (+/- 12)
test f64_is_finite_std ... bench: 128 ns/iter (+/- 25)
test f64_is_infinite_abs ... bench: 54 ns/iter (+/- 5)
test f64_is_infinite_std ... bench: 93 ns/iter (+/- 23)
```
Rollup merge of #57351 - oli-obk:cheap_const_ops, r=RalfJung
Don't actually create a full MIR stack frame when not needed
r? @dotdash
This should significantly reduce overhead during const propagation and reduce overhead *after* copy propagation (cc https://github.com/rust-lang/rust/issues/36673)
bors [Sat, 12 Jan 2019 20:11:36 +0000 (20:11 +0000)]
Auto merge of #56759 - petrochenkov:prestabuni, r=nikomatsakis
Stabilize `uniform_paths`
Address all the things described in https://github.com/rust-lang/rust/issues/56417.
Assign visibilities to `macro_rules` items - `pub` to `macro_export`-ed macros and `pub(crate)` to non-exported macros, these visibilities determine how far these macros can be reexported with `use`.
Prohibit use of reexported inert attributes and "tool modules", after renaming (e.g. `use inline as imported_inline`) their respective tools and even compiler passes won't be able to recognize and properly check them.
Also turn use of uniform paths in 2015 macros into an error, I'd prefer to neither remove nor stabilize them right away because I still want to make some experiments in this area (uniform path fallback was added to 2015 macros used on 2018 edition in https://github.com/rust-lang/rust/pull/56053#issuecomment-441405140).
UPDATE: The last commit also stabilizes the feature `uniform_paths`.
resolve: Prohibit use of uniform paths in macros originating from 2015 edition
...while still keeping ambiguity errors future-proofing for uniform paths.
This corner case is not going to be stabilized for 1.32 and needs some more general experiments about retrofitting 2018 import rules to 2015 edition
bors [Sat, 12 Jan 2019 11:22:20 +0000 (11:22 +0000)]
Auto merge of #57542 - Centril:rollup, r=Centril
Rollup of 26 pull requests
Successful merges:
- #56425 (Redo the docs for Vec::set_len)
- #56906 (Issue #56905)
- #57042 (Don't call `FieldPlacement::count` when count is too large)
- #57175 (Stabilize `let` bindings and destructuring in constants and const fn)
- #57192 (Change std::error::Error trait documentation to talk about `source` instead of `cause`)
- #57296 (Fixed the link to the ? operator)
- #57368 (Use CMAKE_{C,CXX}_COMPILER_LAUNCHER for ccache)
- #57400 (Rustdoc: update Source Serif Pro and replace Heuristica italic)
- #57417 (rustdoc: use text-based doctest parsing if a macro is wrapping main)
- #57433 (Add link destination for `read-ownership`)
- #57434 (Remove `CrateNum::Invalid`.)
- #57441 (Supporting backtrace for x86_64-fortanix-unknown-sgx.)
- #57450 (actually take a slice in this example)
- #57459 (Reference tracking issue for inherent associated types in diagnostic)
- #57463 (docs: Fix some 'second-edition' links)
- #57466 (Remove outdated comment)
- #57493 (use structured suggestion when casting a reference)
- #57498 (make note of one more normalization that Paths do)
- #57499 (note that FromStr does not work for borrowed types)
- #57505 (Remove submodule step from README)
- #57510 (Add a profiles section to the manifest)
- #57511 (Fix undefined behavior)
- #57519 (Correct RELEASES.md for 1.32.0)
- #57522 (don't unwrap unexpected tokens in `format!`)
- #57530 (Fixing a typographical error.)
- #57535 (Stabilise irrefutable if-let and while-let patterns)
Rollup merge of #57511 - jethrogb:jb/fix-undef, r=cramertj
Fix undefined behavior
From the [`MaybeUninit::get_mut` docs](https://doc.rust-lang.org/std/mem/union.MaybeUninit.html):
> It is up to the caller to guarantee that the the MaybeUninit really is in an initialized state, otherwise this will immediately cause undefined behavior.
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