dotnet / dotnet/csharplang

Proposal: list pattern

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#3,435 68 comments 120 reactions 1 assignee Claimed by @jcouv View on GitHub
Implemented Needs ECMA Spec Proposal Proposal champion
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C#
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Description

Allow `is [ 1, 2, 3 ]` (list pattern), ~~`is [length]` (length pattern)~~ and `is [ 1, ..var x, 5 ]` (slice pattern).

Speclet: https://github.com/dotnet/csharplang/blob/main/proposals/csharp-11.0/list-patterns.md

See https://github.com/dotnet/csharplang/pull/3245

LDM Discussions:
* https://github.com/dotnet/csharplang/blob/master/meetings/2020/LDM-2020-12-14.md
* https://github.com/dotnet/csharplang/blob/master/meetings/2020/LDM-2020-12-16.md
* https://github.com/dotnet/csharplang/blob/master/meetings/2021/LDM-2021-02-03.md#list-patterns-on-ienumerable
* https://github.com/dotnet/csharplang/blob/main/meetings/2021/LDM-2021-04-12.md
* https://github.com/dotnet/csharplang/blob/main/meetings/2021/LDM-2021-06-07.md#list-patterns
* https://github.com/dotnet/csharplang/blob/main/meetings/2021/LDM-2021-06-14.md#list-pattern-syntax
* https://github.com/dotnet/csharplang/blob/main/meetings/2021/LDM-2021-06-21.md#list-patterns-in-recursive-patterns
* https://github.com/dotnet/csharplang/blob/main/meetings/2021/LDM-2021-09-22.md#open-questions-in-list-patterns
* https://github.com/dotnet/csharplang/blob/main/meetings/2021/LDM-2021-09-22.md#open-questions-in-list-patterns
* https://github.com/dotnet/csharplang/blob/main/meetings/2021/LDM-2021-10-13.md
* https://github.com/dotnet/csharplang/blob/main/meetings/2021/LDM-2021-10-20.md#open-questions-in-list-patterns
* https://github.com/dotnet/csharplang/blob/main/meetings/2022/LDM-2022-03-09.md#ambiguity-of--in-collection-expressions

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