Add release notes for 1.58

[tmandry]

r? @rust-lang/release

[rust-highfive]

r? @Mark-Simulacrum

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[tmandry]

All comments have been addressed (cc @rust-lang/release again).

I'm officially on vacation starting tomorrow; I may check back here, but feel free to push to my branch / merge without me.

[emilyalbini]

@bors r+ rollup

[bors]

📌 Commit 81963b1 has been approved by pietroalbini

[marmeladema]

I don't think any of the float methods are actually usable in const context: https://github.com/rust-lang/rust/blob/master/library/core/src/time.rs#L686

#89542 only stabilized:

impl Duration {
    pub const fn new(secs: u64, nanos: u32) -> Duration;
    pub const fn checked_add(self, rhs: Duration) -> Option<Duration>;
    pub const fn saturating_add(self, rhs: Duration) -> Duration;
    pub const fn checked_sub(self, rhs: Duration) -> Option<Duration>;
    pub const fn saturating_sub(self, rhs: Duration) -> Duration;
    pub const fn checked_mul(self, rhs: u32) -> Option<Duration>;
    pub const fn saturating_mul(self, rhs: u32) -> Duration;
    pub const fn checked_div(self, rhs: u32) -> Option<Duration>;
}

[marmeladema]

cc @pietroalbini @tmandry

[jhpratt]

Confirming this comment is correct.

[emilyalbini]

Good catch @marmeladema, I'll fix it in a bit.

@bors r-

[emilyalbini]

@bors r+ rollup

[bors]

📌 Commit 0e13d0c has been approved by pietroalbini

[marmeladema]

Do we also want to remove those references?

[emilyalbini]

That shouldn't be publicly visible, someone can open a PR later removing that.