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[Version 10.0] Feature support for record structs#1556

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[Version 10.0] Feature support for record structs#1556
RexJaeschke wants to merge 11 commits into
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v10-record-structs

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@RexJaeschke RexJaeschke commented Jan 28, 2026 •
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The original version of this PR has been modified based on Issue #1683.

This is Rex's adaptation of the corresponding MS proposal.

@RexJaeschke RexJaeschke added this to the C# 10 milestone Jan 28, 2026
@RexJaeschke RexJaeschke added type: feature This issue describes a new feature Review: pending Proposal is available for review labels Jan 28, 2026
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RexJaeschke marked this pull request as draft January 28, 2026 16:41
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RexJaeschke commented Jan 28, 2026
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Comment thread standard/structs.md
;

record_struct_body
: struct_body ';'?

@RexJaeschke RexJaeschke Jan 28, 2026

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The optional trailing semicolon was not mentioned in the MS proposal; however, I discovered that VS 2026 18.2.1 allows it (just as we allow it for record classes). What was the intent here?

@RexJaeschke RexJaeschke reopened this Jan 28, 2026
@RexJaeschke RexJaeschke mentioned this pull request Feb 4, 2026
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RexJaeschke added a commit that referenced this pull request Feb 13, 2026
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highlight error on merge of PR #1556
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BillWagner added a commit that referenced this pull request Apr 15, 2026
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Apply delta from PR #1556 (Record structs) - 4 new review commits
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BillWagner force-pushed the v10-record-structs branch from 078cdeb to 569310a Compare May 13, 2026 15:07
@RexJaeschke RexJaeschke mentioned this pull request May 19, 2026
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RexJaeschke and others added 10 commits June 24, 2026 14:58
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support record structs
28bf8d7
@RexJaeschke @BillWagner
support record structs
361e094
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support record structs
d032e2f
@RexJaeschke @BillWagner
fix formatting and link
dede65d
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fix link
67abdfe
@BillWagner
Clean up blank lines in classes.md
129336a 
Remove unnecessary blank lines from classes.md
@BillWagner
Review updates
f2b1381 
- Grammar allows `record` and `record class`
- `with` expressions allowed in non-record struct types
- a couple small merge issues where text was lost
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reorg record-related text
a759c94
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reorg record-related text
fa53eae
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fix links
36f3bcf
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BillWagner force-pushed the v10-record-structs branch from 9f994ae to 36f3bcf Compare June 24, 2026 18:58
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BillWagner commented Jun 24, 2026

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An earlier version of this feature is already present on alpha-v10 from a prior meeting. Edits made to this PR since then are not yet on alpha-v10; they will land at the next propagation. If you need them on alpha-v10 sooner, please open a separate PR targeting alpha-v10.
Thanks!

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RexJaeschke commented Jul 21, 2026

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After researching and writing-up "Primary constructors" as a general feature in v12 for classes and structs outside of record variants, I have made a lot of tweaks to this spec (and to the V9 record class spec) to ease the transition to that v12 spec.

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