Fix let-in scoping in light syntax via LexFilter change#19501

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Copilot wants to merge 15 commits intomainfrom

copilot/fix-9141961-29048891-3fc9276d-8a02-4a9e-b5d2-cc88eecabc17

Commits on Apr 21, 2026

Initial plan

Copilot
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T-Gro
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Add warning FS3885 for let-in with multi-line body in sequence expressions

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T-Gro
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Update release notes wording for FS3885

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T-Gro
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Fix CI failures: remove 'in' keyword triggering FS3885 and add XLF entries

T-Gro
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Copilot
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Fix CI failures: remove 'in' keyword in RemoveUnnecessaryParenthesesTests.fs triggering FS3885, fix PR number in release notes, add .Language/preview.md entry

T-Gro
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Copilot
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Fix issue reference in release notes: #7091 -> #7741

T-Gro
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Copilot
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Retrigger CI: FindReferences flaky test failure unrelated to PR changes

T-Gro
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Copilot
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Move let-in handling from type-checking warning to LexFilter change

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T-Gro
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Add SyntaxTree tests for let-in scoping and remove dead FS3885 warning

T-Gro
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Copilot
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Rename feature, fix release notes, fix AnonModule range, add tests

T-Gro
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Copilot
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Fix CI: update diagnostic range in WarnExpressionTests after LexFilter scoping change

T-Gro
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Copilot
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Fix comment: clarify seq block scoping includes continuation lines

T-Gro
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Copilot
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Revert pars.fsy AnonModule range change to fix IDE completions

T-Gro
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Copilot
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Fix merge conflicts with main and update baselines for improved diagnostics

T-Gro
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Copilot
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Fix review: revert Debug-build baselines, deduplicate release notes

T-Gro
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Copilot
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