C#: Remove expanded assignments.#21452

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michaelnebel wants to merge 13 commits intogithub:mainfrom

michaelnebel:csharp/expandedassignment

Commits on Mar 23, 2026

C#: Don't extract expanded assignments and swap child indices for assignments.
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C#: Update the DB scheme to reflect that assign arithmetic- and bitwise operations are operator calls.
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C#: Update the child indices for assignments, update Assign classes to extend OperatorCall and add AssignOperation classes.
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C#: Deprecate the expanded assignment predicate as we no longer extract expanded assignments.
michaelnebel
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C#: Cleaup expanded assignments from the dispatch logic.
michaelnebel
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C#: Introduce a new kind of assignable definitions for compound assignments (those that was previously covered by expanded assignments).
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C#: Update the CFG implementation based on the new operations and remove hack that rotates children of assignments.
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C#: Upgrade libraries and queries to use the new Operation classes.
michaelnebel
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C#: Add/update tests and expected output.
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C#: Add operation types to the DB scheme.
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C#: Use the DB types and replace the abstract class implementation.
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C#: Adress review comments.
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C#: Remove expr_parent_adjusted.
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