foo1.cs

      switch (myJumpStatement)
      {
        case IReturnStatement returnStatement when returnStatement.Value != null:
          ReplaceWithValue(returnStatement, returnStatement.Value);
          break;

        case IYieldStatement yieldStatement when yieldStatement.Expression != null:
          ReplaceWithValue(yieldStatement, yieldStatement.Value);
          break;

        default:
          myJumpStatement.RemoveOrReplaceByEmptyStatement();
          break;
      }

foo2.cs

      switch (myJumpStatement)
      {
        case IReturnStatement { Value: { } value } returnStatement:
          ReplaceWithValue(returnStatement, value);
          break;

        case IYieldStatement { Expression: { } value } yieldStatement:
          ReplaceWithValue(yieldStatement, value);
          break;

        default:
          myJumpStatement.RemoveOrReplaceByEmptyStatement();
          break;
      }