public TypeConversionAnalyzer(SemanticModel semanticModel, CSharpCompilation csCompilation,
                               HashSet <string> extraUsingDirectives, SyntaxGenerator csSyntaxGenerator, ExpressionEvaluator expressionEvaluator)
 {
     _semanticModel        = semanticModel;
     _csCompilation        = csCompilation;
     _extraUsingDirectives = extraUsingDirectives;
     _csSyntaxGenerator    = csSyntaxGenerator;
     _expressionEvaluator  = expressionEvaluator;
 }