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A surprising enum size optimization in the Rust compiler

(jpfennell.com)
148 points returningfory2 | 2 comments | 07 Apr 25 22:30 UTC | HN request time: 0.423s | source
1. subarctic ◴[10 Apr 25 18:01 UTC] No.43646490[source]▶
When was this implemented? I remember when people used to have to manually flatten nested enums in order to save space
replies(1): >>43646704 #
2. returningfory2 ◴[10 Apr 25 18:22 UTC] No.43646704[source]▶
Many years ago I think, here: https://github.com/rust-lang/rust/issues/46213. (Found this via https://lobste.rs/s/w3jjb2/surprising_enum_size_optimization...)