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Update sizes.md (#775)

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Richard Penman 2023-06-09 14:00:33 -04:00 committed by GitHub
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@ -58,7 +58,7 @@ Key Points:
* `dbg_size!(&i32)`: size 8 bytes, align: 8 bytes (on a 64-bit machine),
* `dbg_size!(Option<&i32>)`: size 8 bytes, align: 8 bytes (null pointer optimization, see below).
* Niche optimization: Rust will merge use unused bit patterns for the enum
* Niche optimization: Rust will merge unused bit patterns for the enum
discriminant.
* Null pointer optimization: For [some