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Rollup merge of #90430 - jkugelman:must-use-std-a-through-n, r=joshtriplett

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Add #[must_use] to remaining std functions (A-N)

I've run out of compelling reasons to group functions together across crates so I'm just going to go module-by-module. This is half of the remaining items from the `std` crate, from A-N.

I added these functions myself. Clippy predictably ignored the `mut` ones, but I don't know why the rest weren't flagged. Check them closely, please? Maybe I overlooked good reasons.

```rust
std::backtrace::Backtrace                                   const fn disabled() -> Backtrace;
std::backtrace::Backtrace<'a>                               fn frames(&'a self) -> &'a [BacktraceFrame];
std::collections::hash_map::RawOccupiedEntryMut<'a, K, V>   fn key_mut(&mut self) -> &mut K;
std::collections::hash_map::RawOccupiedEntryMut<'a, K, V>   fn get_mut(&mut self) -> &mut V;
std::collections::hash_map::RawOccupiedEntryMut<'a, K, V>   fn get_key_value(&mut self) -> (&K, &V);
std::collections::hash_map::RawOccupiedEntryMut<'a, K, V>   fn get_key_value_mut(&mut self) -> (&mut K, &mut V);
std::env                                                    fn var_os<K: AsRef<OsStr>>(key: K) -> Option<OsString>;
std::env                                                    fn split_paths<T: AsRef<OsStr> + ?Sized>(unparsed: &T) -> SplitPaths<'_>;
std::io::Error                                              fn get_mut(&mut self) -> Option<&mut (dyn error::Error + Send + Sync + 'static)>;
```

Parent issue: #89692

r? `@joshtriplett`
This commit is contained in:
Matthias Krüger 2021-10-31 13:20:06 +01:00 • committed by GitHub
commit 26f505c433
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18 changed files with 68 additions and 14 deletions
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3
library/std/src/io/mod.rs
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@ -1308,6 +1308,7 @@ pub struct Initializer(bool);
impl Initializer {
/// Returns a new `Initializer` which will zero out buffers.
#[unstable(feature = "read_initializer", issue = "42788")]
#[must_use]
#[inline]
pub fn zeroing() -> Initializer {
Initializer(true)
@ -1322,6 +1323,7 @@ impl Initializer {
/// the method accurately reflects the number of bytes that have been
/// written to the head of the buffer.
#[unstable(feature = "read_initializer", issue = "42788")]
#[must_use]
#[inline]
pub unsafe fn nop() -> Initializer {
Initializer(false)
@ -1329,6 +1331,7 @@ impl Initializer {
/// Indicates if a buffer should be initialized.
#[unstable(feature = "read_initializer", issue = "42788")]
#[must_use]
#[inline]
pub fn should_initialize(&self) -> bool {
self.0