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fern-support merged 1 commit into from
Mar 22, 2026
Merged

Update changelogs from fern repo #4478

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10 changes: 10 additions & 0 deletions fern/products/sdks/overview/rust/changelog/2026-03-21.mdx
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## 0.24.0
**`(feat):`** Improve discriminated union design with inlined variants and constructors. When an inner
type is only referenced by a single union variant, its fields are now inlined directly into
the enum variant instead of using a wrapper struct with `#[serde(flatten)]`. All enum
variants now include `#[non_exhaustive]` for forward compatibility, and constructor methods
are generated for every variant (required since `#[non_exhaustive]` prevents direct
construction outside the crate). Empty variants use struct syntax (`Variant {}`) instead
of unit syntax.


## 0.23.0
**`(feat):`** Generate builders for all struct types. The builder pattern is inspired by
other popular Rust SDKs (e.g. AWS), so that users now have the option between the
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