Fix incorrect parser diagnostic message for duplicate export modifier#15879

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copilot/fix-duplicate-export-modifier

Commits on Nov 21, 2025

Initial plan

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Changes before error encountered

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Fix duplicate export modifier diagnostic message

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Update snapshots after fixing duplicate export modifier diagnostic

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Address review feedback: simplify modifier handling

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Initial plan

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Update snapshots after rebase and conformance run

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Add test cases for declare-before-export and duplicate-declare modifiers

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