Bumps the minor group in /src/bare-metal/aps/examples with 1 update:
[bitflags](https://github.com/bitflags/bitflags).
Updates `bitflags` from 2.5.0 to 2.6.0
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Bumps the minor group in /src/exercises/bare-metal/rtc with 1 update:
[bitflags](https://github.com/bitflags/bitflags).
Updates `bitflags` from 2.5.0 to 2.6.0
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Bumps the patch group in /src/bare-metal/aps/examples with 2 updates:
[log](https://github.com/rust-lang/log) and
[cc](https://github.com/rust-lang/cc-rs).
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Bumps the patch group in /src/bare-metal/aps/examples with 1 update:
[cc](https://github.com/rust-lang/cc-rs).
Updates `cc` from 1.0.99 to 1.0.100
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Bumps the minor group in /src/bare-metal/microcontrollers/examples with
1 update: [microbit-v2](https://github.com/nrf-rs/microbit).
Updates `microbit-v2` from 0.14.0 to 0.15.0
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Bumps the minor group with 2 updates in the
/src/exercises/bare-metal/compass directory:
[lsm303agr](https://github.com/eldruin/lsm303agr-rs) and
[microbit-v2](https://github.com/nrf-rs/microbit).
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Bumps the patch group in /src/exercises/bare-metal/rtc with 1 update:
[cc](https://github.com/rust-lang/cc-rs).
Updates `cc` from 1.0.99 to 1.0.100
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Bumps the patch group with 2 updates in the / directory:
[serde_json](https://github.com/serde-rs/json) and
[reqwest](https://github.com/seanmonstar/reqwest).
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The type returned by `String::from_utf8(raw)`, is `Result<_>` and needs
to be mapped to match the type of the return type of `next`. You get
this error otherwise:
```
Compiling playground v0.0.1 (/playground)
warning: unused import: `ErrorKind`
--> src/main.rs:1:21
|
1 | use std::io::{self, ErrorKind};
| ^^^^^^^^^
|
= note: `#[warn(unused_imports)]` on by default
error[E0308]: mismatched types
--> src/main.rs:29:17
|
29 | Ok(Some(s))
| ---- ^ expected `String`, found `Result<String, FromUtf8Error>`
| |
| arguments to this enum variant are incorrect
|
= note: expected struct `String`
found enum `Result<String, FromUtf8Error>`
help: the type constructed contains `Result<String, FromUtf8Error>` due to the type of the argument passed
--> src/main.rs:29:12
|
29 | Ok(Some(s))
| ^^^^^-^
| |
| this argument influences the type of `Some`
note: tuple variant defined here
--> /playground/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/option.rs:579:5
|
579 | Some(#[stable(feature = "rust1", since = "1.0.0")] T),
| ^^^^
help: use the `?` operator to extract the `Result<String, FromUtf8Error>` value, propagating a `Result::Err` value to the caller
|
29 | Ok(Some(s?))
| +
For more information about this error, try `rustc --explain E0308`.
warning: `playground` (bin "playground") generated 1 warning
error: could not compile `playground` (bin "playground") due to 1 previous error; 1 warning emitted
```
Undefined behavior does not just mean that the behavior can be different
on different platforms. It is much worse than that: the runtime behavior
can be completely nonsensical since the whole program has undefined
behavior.
The compiler will optimizer as if there is no undefined behavior and
will can lead to strange situations as the compiler concludes that
things like `a > a + 1000` can never be reached if `a` is a signed 8-bit
value (since reaching it would trigger undefined behavior).
Bumps the patch group in /src/bare-metal/aps/examples with 1 update:
[cc](https://github.com/rust-lang/cc-rs).
Updates `cc` from 1.0.98 to 1.0.99
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Bumps the patch group in /src/exercises/bare-metal/rtc with 1 update:
[cc](https://github.com/rust-lang/cc-rs).
Updates `cc` from 1.0.98 to 1.0.99
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The speaker notes suggest an evolution of the code to support a periodic
timer, but the last step was under-specified.
(As mentioned by @fw-immunant and referenced in #1536)
Bumps the minor group with 1 update:
[tokio](https://github.com/tokio-rs/tokio).
Updates `tokio` from 1.37.0 to 1.38.0
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I've been thinking it'd be simpler to introduce `dyn Trait` via `&dyn
Trait` rather than waiting for the smart pointers section and `Box<dyn
Trait>`. This PR adds a slide to the Generics section that introduces
`&dyn Trait` and compares it to `&impl Trait`, juxtaposing
monomorphization and static dispatch against type-erasure and dynamic
dispatch. I've then updated the existing trait object slide to call back
to the earlier introduction, and call out that using `Box<dyn Trait>`
gives you an owned trait object rather than a borrowed one.
Add a note to the `Copy` slide noting that shared references are `Copy`.
A student asked about this today, and it's something I want to remember
to mention in future classes.
Bumps the minor group in /src/bare-metal/microcontrollers/examples with
1 update: [nrf52833-hal](https://github.com/nrf-rs/nrf-hal).
Updates `nrf52833-hal` from 0.17.1 to 0.18.0
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/nrf-rs/nrf-hal/blob/master/CHANGELOG.md">nrf52833-hal's
changelog</a>.</em></p>
<blockquote>
<h2>[0.18.0]</h2>
<h3>Breaking changes</h3>
<ul>
<li>Updated <code>nrf-usbd</code> to 0.3.0. (<a
href="https://redirect.github.com/nrf-rs/nrf-hal/issues/460">#460</a>)</li>
</ul>
<h3>New features</h3>
<ul>
<li>Added support for nRF52805 (<a
href="https://redirect.github.com/nrf-rs/nrf-hal/issues/422">#422</a>).</li>
<li>Added implementation of RTIC <code>Monotonic</code> for RTC and
TIMER, behind new <code>monotonic</code> feature (<a
href="https://redirect.github.com/nrf-rs/nrf-hal/issues/427">#427</a>).</li>
</ul>
<p><a
href="https://redirect.github.com/nrf-rs/nrf-hal/issues/422">#422</a>:
<a
href="https://redirect.github.com/nrf-rs/nrf-hal/pull/422">nrf-rs/nrf-hal#422</a>
<a
href="https://redirect.github.com/nrf-rs/nrf-hal/issues/427">#427</a>:
<a
href="https://redirect.github.com/nrf-rs/nrf-hal/pull/427">nrf-rs/nrf-hal#427</a>
<a
href="https://redirect.github.com/nrf-rs/nrf-hal/issues/460">#460</a>:
<a
href="https://redirect.github.com/nrf-rs/nrf-hal/pull/440">nrf-rs/nrf-hal#440</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="997d0bd27a"><code>997d0bd</code></a>
Merge pull request <a
href="https://redirect.github.com/nrf-rs/nrf-hal/issues/476">#476</a>
from nrf-rs/release</li>
<li><a
href="bb7aef2593"><code>bb7aef2</code></a>
Prepare for 0.18.0 release.</li>
<li><a
href="090ce0ec9a"><code>090ce0e</code></a>
Merge pull request <a
href="https://redirect.github.com/nrf-rs/nrf-hal/issues/427">#427</a>
from Kyrne/master</li>
<li><a
href="4c00992a68"><code>4c00992</code></a>
Use consistent feature name.</li>
<li><a
href="eb8b34a73c"><code>eb8b34a</code></a>
Merge pull request <a
href="https://redirect.github.com/nrf-rs/nrf-hal/issues/477">#477</a>
from nrf-rs/buildfix</li>
<li><a
href="ee11451354"><code>ee11451</code></a>
rename user facing feature to rtic-monotonic</li>
<li><a
href="c8bf535d7b"><code>c8bf535</code></a>
Correct docs (<a
href="https://redirect.github.com/nrf-rs/nrf-hal/issues/18">#18</a>)</li>
<li><a
href="3c353da5f0"><code>3c353da</code></a>
Monotonic doesn't build on nrf51 or nrf52832 so remove the feature.</li>
<li><a
href="8eff0e5fc4"><code>8eff0e5</code></a>
Format doc comments and fix typos.</li>
<li><a
href="bb1bb77b30"><code>bb1bb77</code></a>
Fix feature conditions.</li>
<li>Additional commits viewable in <a
href="https://github.com/nrf-rs/nrf-hal/compare/v0.17.1...v0.18.0">compare
view</a></li>
</ul>
</details>
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The example of returning a reference to a local variable doesn't compile
due to a missing lifetime specifier, which isn't what we're trying to
demonstrate with that example. I usually add the lifetime in manually in
order to demonstrate the compiler error, but it occurs to me that if we
make the argument a reference we can sneakily get the correct compiler
error without having to introduce the lifetime syntax.
Bumps the patch group in /src/exercises/bare-metal/rtc with 1 update:
[cc](https://github.com/rust-lang/cc-rs).
Updates `cc` from 1.0.97 to 1.0.98
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<li>Fix detect_compiler_family.c not being created by <a
href="https://github.com/Jake-Shadle"><code>@Jake-Shadle</code></a> in
<a
href="https://redirect.github.com/rust-lang/cc-rs/pull/1072">rust-lang/cc-rs#1072</a></li>
<li>Release cc 1.0.98 by <a
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href="https://redirect.github.com/rust-lang/cc-rs/pull/1073">rust-lang/cc-rs#1073</a></li>
</ul>
<h2>New Contributors</h2>
<ul>
<li><a href="https://github.com/klensy"><code>@klensy</code></a> made
their first contribution in <a
href="https://redirect.github.com/rust-lang/cc-rs/pull/1067">rust-lang/cc-rs#1067</a></li>
</ul>
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Fix detect_compiler_family.c not being created (<a
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<li><a
href="61b81c8b4c"><code>61b81c8</code></a>
Fix paths on Mac Catalyst (<a
href="https://redirect.github.com/rust-lang/cc-rs/issues/1070">#1070</a>)</li>
<li><a
href="b7455eb81c"><code>b7455eb</code></a>
Cleanup some deprecated, unused allows (<a
href="https://redirect.github.com/rust-lang/cc-rs/issues/1067">#1067</a>)</li>
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Bumps the patch group in /src/bare-metal/aps/examples with 1 update:
[cc](https://github.com/rust-lang/cc-rs).
Updates `cc` from 1.0.97 to 1.0.98
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href="https://github.com/klensy"><code>@klensy</code></a> in <a
href="https://redirect.github.com/rust-lang/cc-rs/pull/1067">rust-lang/cc-rs#1067</a></li>
<li>Fix paths on Mac Catalyst by <a
href="https://github.com/madsmtm"><code>@madsmtm</code></a> in <a
href="https://redirect.github.com/rust-lang/cc-rs/pull/1070">rust-lang/cc-rs#1070</a></li>
<li>Fix detect_compiler_family.c not being created by <a
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Fix detect_compiler_family.c not being created (<a
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Fix paths on Mac Catalyst (<a
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<li><a
href="b7455eb81c"><code>b7455eb</code></a>
Cleanup some deprecated, unused allows (<a
href="https://redirect.github.com/rust-lang/cc-rs/issues/1067">#1067</a>)</li>
<li>See full diff in <a
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Trying to reproduce this RVO shows that actually the optimization that
is used here is simple inlining. Once inlining is disabled, the
addresses change, even with `-O -C opt-level=3`.
The return of the values is also never changed to an "efficient memcpy",
but instead was returned on eax+edx, although this result is of course
specific to the calling convention of the platform ABI, but no memcpy on
the most popular amd64 architecture.
I don't think it's educationally important to teach RVO here, so I
didn't go into any length trying to force Rust to do a real RVO (passing
Point address into the function on the assembly level, so the function
can fill in the addition). In my opinion the only important thing is,
that if a student is actually clicking the Playground link and looks
into the assembly, then our description should match the generated code.
That's why I just fixed the content instead of trying to fix the example
to be RVO.
Bumps the patch group in /src/bare-metal/aps/examples with 1 update:
[cc](https://github.com/rust-lang/cc-rs).
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Bumps the patch group in /src/exercises/bare-metal/rtc with 1 update:
[cc](https://github.com/rust-lang/cc-rs).
Updates `cc` from 1.0.96 to 1.0.97
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