[Proposal]: Block-bodied switch expression arms

[333fred]

Block-bodied switch expression arms

• Specification: https://github.com/dotnet/csharplang/blob/159fb27e434f9bc41362f65e5ff9fe16647c4dd2/proposals/block-bodied-switch-expression-arms.md
• Discussion: #8607

Summary

This proposal is an enhancement to the new switch expressions added in C# 8.0: allowing multiple statements in a switch expression arm. We permit braces after the arrow, and use break value; to return a value from the switch expression arm.

Design meetings

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-2024-08-28.md#block-bodied-switch-expression-arms