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Rollup of 13 pull requests #77212

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Rollup of 13 pull requests #77212

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73ada2d
Explicitly document the size guarantees that Option makes.
ltratt Aug 12, 2020
f5118a5
Clarify and add guarantee about `transmute`.
ltratt Aug 12, 2020
83f47aa
Be clear about the reverse `transmute` guarantees.
ltratt Aug 12, 2020
f3d7196
Be clearer about Some/None transmute.
ltratt Aug 12, 2020
8cb8955
Change notation.
ltratt Aug 12, 2020
55802e3
Add Rust function pointers.
ltratt Aug 12, 2020
68209c3
Rename the types for clarity.
ltratt Aug 17, 2020
9bac577
Grammar tweak.
ltratt Aug 17, 2020
2ac89ff
Point at named argument not found when using `format_args_capture` in…
estebank Sep 8, 2020
094d67a
Add accessors to Command.
ehuss Sep 21, 2020
945a732
Update mdBook
camelid Sep 23, 2020
50d9663
Update cargo
ehuss Sep 24, 2020
9baa601
Add `x.py setup`
jyn514 Sep 12, 2020
bab15f7
Remove std::io::lazy::Lazy in favour of SyncOnceCell
m-ou-se Sep 24, 2020
e9b25f5
Add test to check stdout flushing during shutdown.
m-ou-se Sep 24, 2020
45700a9
Drop use of Arc from Stdin and Stdout.
m-ou-se Sep 24, 2020
12ada5c
Remove TrustedLen requirement from BuilderMethods::switch
est31 Sep 24, 2020
6f9c132
Call ReentrantMutex::init() in stdout().
m-ou-se Sep 24, 2020
47843f5
update Miri
RalfJung Sep 24, 2020
257f6e5
Reopen standard streams when they are closed on Unix
tmiasko Sep 25, 2020
187162e
Add missing code examples on slice iter types
GuillaumeGomez Sep 22, 2020
900daba
Remove stray word from `ClosureKind::extends` docs
LingMan Sep 25, 2020
aa6a2f4
Rename `whence` to `span`
camelid Sep 25, 2020
41e8c8c
Rollup merge of #75295 - tmiasko:fds, r=Amanieu
jonas-schievink Sep 26, 2020
d00ca17
Rollup merge of #75454 - ltratt:option_optimisation_guarantees, r=dto…
jonas-schievink Sep 26, 2020
f0caf1d
Rollup merge of #76485 - estebank:format_arg_capture_spans, r=davidtwco
jonas-schievink Sep 26, 2020
73c3a67
Rollup merge of #76631 - jyn514:x.py-setup, r=Mark-Simulacrum
jonas-schievink Sep 26, 2020
df98bae
Rollup merge of #77029 - ehuss:command-access, r=Mark-Simulacrum
jonas-schievink Sep 26, 2020
1f38dba
Rollup merge of #77076 - GuillaumeGomez:missing-code-examples-slice-i…
jonas-schievink Sep 26, 2020
81945dc
Rollup merge of #77127 - camelid:update-mdbook, r=Dylan-DPC
jonas-schievink Sep 26, 2020
d421d4e
Rollup merge of #77129 - ehuss:update-cargo, r=ehuss
jonas-schievink Sep 26, 2020
0206cfc
Rollup merge of #77154 - fusion-engineering-forks:lazy-stdio, r=dtolnay
jonas-schievink Sep 26, 2020
216ed7b
Rollup merge of #77161 - est31:swich_len_already_trusted, r=petrochenkov
jonas-schievink Sep 26, 2020
7776d68
Rollup merge of #77166 - RalfJung:miri, r=RalfJung
jonas-schievink Sep 26, 2020
7e160b6
Rollup merge of #77204 - LingMan:patch-3, r=jonas-schievink
jonas-schievink Sep 26, 2020
bfb0d2d
Rollup merge of #77207 - camelid:whence-to-span, r=jyn514
jonas-schievink Sep 26, 2020
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Be clear about the reverse transmute guarantees.
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@ltratt
ltratt committed Aug 12, 2020
commit 83f47aa11bd664ed8a15ef9833063833b7b3e71c
5 changes: 3 additions & 2 deletions library/core/src/option.rs
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Expand Up @@ -83,8 +83,9 @@
//! * [`ptr::NonNull<T>`]
//! * `#[repr(transparent)]` struct around one of the types in this list.
//!
//! For the above cases, it is guaranteed that one can use [`mem::transmute`]
//! between `T` and `Option<T>` and vice versa.
//! For the above cases, it is guaranteed that one can [`mem::transmute`]
//! from all valid values of `T` to `Option<T>` but only from non-`None`
//! Option<T>` to `T`.
//!
//! # Examples
//!
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