[Proposal]: Discriminated Unions
- Dominant language
- C#
- Stars
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- Forks
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- Avg merge
- 11h 1m
- Merged PRs (30d)
- 3
Description
# Discriminated Unions
* Union proposals overview: https://github.com/dotnet/csharplang/blob/main/meetings/working-groups/discriminated-unions/union-proposals-overview.md
* Discussion: https://github.com/dotnet/csharplang/discussions/8313
* Past discussion threads
* https://github.com/dotnet/csharplang/discussions/8926
* https://github.com/dotnet/csharplang/discussions/8927
* https://github.com/dotnet/csharplang/discussions/7010
* https://github.com/dotnet/csharplang/discussions/8942
## Summary
[summary]: #summary
A proposal for type unions (aka discriminated unions) in C#.
## Design meetings
* https://github.com/dotnet/csharplang/blob/main/meetings/2022/LDM-2022-08-31.md#discriminated-unions
* https://github.com/dotnet/csharplang/blob/main/meetings/2022/LDM-2022-09-26.md#discriminated-unions
* https://github.com/dotnet/csharplang/blob/main/meetings/2024/LDM-2024-07-24.md#discriminated-unions
* https://github.com/dotnet/csharplang/blob/main/meetings/2025/LDM-2025-01-13.md#discriminated-unions
* https://github.com/dotnet/csharplang/blob/main/meetings/2025/LDM-2025-08-13.md#unions
* https://github.com/dotnet/csharplang/blob/main/meetings/2025/LDM-2025-08-18.md#unions
* https://github.com/dotnet/csharplang/blob/main/meetings/2025/LDM-2025-08-27.md#type-value-conversion
* https://github.com/dotnet/csharplang/blob/main/meetings/2025/LDM-2025-08-27.md#union-syntax
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