private IEnumerable <Diagnostic> AnalyzeInitializerExpression(InitializerExpressionSyntax node, SemanticModel semanticModel)
{
var symbol = node.GetEnclosingSymbol(semanticModel);
var diagnostics = node.Expressions.OfType <AssignmentExpressionSyntax>()
.Where(_ => _.IsKind(SyntaxKind.SimpleAssignmentExpression))
.SelectMany(_ => AnalyzeExpression(_.Right, symbol.Name, _.GetLocation()));
return(diagnostics);
}