private static SpeculativeSyntaxTreeSemanticModel CreateCore(CSharpSemanticModel parentSemanticModel, CSharpSyntaxNode root, Binder rootBinder, int position, SpeculativeBindingOption bindingOption)
{
Debug.Assert(parentSemanticModel is SyntaxTreeSemanticModel);
Debug.Assert(root != null);
Debug.Assert(root is TypeSyntax || root is CrefSyntax);
Debug.Assert(rootBinder != null);
Debug.Assert(rootBinder.IsSemanticModelBinder);
var speculativeModel = new SpeculativeSyntaxTreeSemanticModel(parentSemanticModel, root, rootBinder, position, bindingOption);
return speculativeModel;
}