Since this visitor is registered via registry.addReturnStatement to process specific nodes, it does not need to recursively traverse the entire AST. Changing the base class to SimpleAstVisitor avoids redundant traversal and improves performance.

Calling super.visitReturnStatement(node) is redundant when using SimpleAstVisitor and registered via registry.addReturnStatement. Furthermore, it was applied inconsistently as it was skipped in several early return paths. Removing it simplifies the code and ensures consistent behavior.

I think we can inline those the same way as I proposed in #238

nit - inconsistent braces. Since we are already omitting them in line 33, probably best to omit them throughout

    final expr = node.expression;
    if (expr is! SimpleIdentifier) return;

    final element = expr.element;
    if (element is! LocalVariableElement) return;

    if (!element.isFinal && !element.isConst) return;

    final block = node.parent;
    if (block == null) return;

Not 100% sure this will work

    return switch (identifier.element) {
      ClassElement _ => true,
      final VariableElement variable ||
      GetterElement(:final VariableElement variable) =>
        variable.isFinal || variable.isConst,
      _ => false
    };

but this should

    return switch (identifier.element) {
      ClassElement _ => true,
      final VariableElement variable => variable.isFinal || variable.isConst,
      GetterElement(:final PropertyInducingElement variable) =>
        variable.isFinal || variable.isConst,
      _ => false
    };

nit - I'd rather have static as the top-most in the class