Fix nullness narrowing in match inside comprehensions#19743
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…#19644) Extract null-narrowing helper EliminateNullnessFromInputType from TcMatchClause and reuse it in TcSequenceExpression's SynExpr.Match handler so the input type is narrowed across clauses inside comprehensions, matching the behavior of plain match expressions. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Fix false-positive FS3261 when pattern matching narrows nullness inside seq/list/array comprehensions.
Fixes #19644