[Proposal]: list-patterns on enumerables

[333fred]

list-patterns on enumerables

• Specification: https://github.com/dotnet/csharplang/blob/main/proposals/inactive/list-patterns-enumerables.md
• Discussion: https://github.com/dotnet/csharplang/discussions/9004

Summary

Allow is [ 1, 2, 3 ] (list pattern) and is [ 1, ..var x, 5 ] (slice pattern) on enumerables.

Design meetings

• https://github.com/dotnet/csharplang/blob/main/meetings/2022/LDM-2022-10-19.md
• https://github.com/dotnet/csharplang/blob/main/meetings/2023/LDM-2023-10-09.md#list-patterns-on-enumerables