C# 14: User defined compound assignment operators.#21372

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michaelnebel wants to merge 10 commits intogithub:mainfrom

michaelnebel:csharp14/usercompoundassignment

Commits on Apr 24, 2026

C#: Add support for compound assignment operators in the TryGetOperatorSymbol method.
michaelnebel
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C#: Re-use the GetTargetSymbol logic from invocations to find the right operator symbol (operators can also be declared in extensions).
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C#: Add change-note.
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C#: Add compound assignment operator QL classes.
michaelnebel
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C#: Update the DB scheme, such that compound assignment operator calls can be considered qualifiable expressions.
michaelnebel
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C#: Add upgrade- and downgrade scripts.
michaelnebel
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C#: Add compound assignment operator call classes.
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C#: Handle compound assignment operators in the dispatch logic (and assignable definition).
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C#: Add tests and update expected test output.
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C#: Add cs/deferenced-value-is-always-null test example for compound operators.
michaelnebel
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