Add ExtendedLayoutAttribute support for F# compiler - #19194

Draft

T-Gro with Copilot wants to merge 22 commits into

mainfrom

copilot/add-extended-layout-attribute-support

Commits on Apr 21, 2026

Initial plan

Copilot
authored and
T-Gro
committed
c438a8f
Add ExtendedLayoutAttribute support - IL layer, infrastructure, and validation

Copilot
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T-Gro
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7a99315
Fix indentation in IlxGen.fs for ExtendedLayout support

Copilot
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T-Gro
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a587076
Add comprehensive tests for ExtendedLayoutAttribute support

Copilot
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T-Gro
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49ae0a0
Fix test files with mock ExtendedLayoutAttribute for testing

Copilot
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T-Gro
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05990ff
Address code review feedback - add comments for magic numbers and fix IL test

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T-Gro
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9d5b9fb
Clarify source of extendedLayoutKind value with runtime issue reference

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T-Gro
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b75b10d
Fix CI: rebase onto main, adapt to WellKnownEntityAttributes, fix tests

T-Gro
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14e1b22
Fix CI: renumber error codes 3885-3888, move release notes to 11.0.100

T-Gro
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Copilot
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cce9acc
Review fixes: correct ECMA-335 comment, clarify hasLayout and dead code

T-Gro
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Copilot
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23d6094
Add missing noExtendedLayoutAttributeCheck for unions, records, enums, and other type kinds

T-Gro
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23e2533
Remove unused error 3886, improve release notes

T-Gro
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8097e76
Remove duplicate release notes entry

T-Gro
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b30c638
Review fixes: add missing noExtendedLayoutAttributeCheck for type abbreviations, update comments

T-Gro
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cee99f5

Commits on May 12, 2026

Merge origin/main into copilot/add-extended-layout-attribute-support

T-Gro
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Copilot
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e68688c

Commits on Aug 18, 2026

Merge remote-tracking branch 'origin/main' into copilot/add-extended-layout-attribute-support
T-Gro
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b79df32
Remove accidentally committed session artifacts (.copilot-prompt.txt, .executor-pid)

T-Gro
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Copilot
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fcaaa81
Add end-to-end ExtendedLayoutAttribute tests against net11 BCL

T-Gro
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2f0f10c
Allow ExtendedLayoutAttribute on [<Struct>] records

T-Gro
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122c437
Give discriminated unions a dedicated ExtendedLayoutAttribute diagnostic

T-Gro
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0eceb1c
Keep the ExtendedLayout test module non-empty on non-.NET-Core TFMs

T-Gro
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Copilot
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39c5d8a
Re-run CI (flaky WindowsNoRealsig_testCoreclr timeout)

T-Gro
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e5e1394