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Move the layout change to 1.67 compat notes

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Josh Stone 2023-01-21 15:08:48 -08:00
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RELEASES.md
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@ -71,6 +71,11 @@ These APIs are now stable in const contexts:
Compatibility Notes
-------------------
- [The layout of `repr(Rust)` types now groups m\*2^n-sized fields with
equivalently aligned ones.](https://github.com/rust-lang/rust/pull/102750/)
This is intended to be an optimization, but it is also known to increase type
sizes in a few cases for the placement of enum tags. As a reminder, the layout
of `repr(Rust)` types is an implementation detail, subject to change.
- [0.5 now rounds to 0 when formatted to 0 decimal places.](https://github.com/rust-lang/rust/pull/102935/)
This makes it consistent with the rest of floating point formatting that
rounds ties toward even digits.