public static TypeDiff CompareTo(this INamespaceOrTypeSymbol symbol, INamespaceOrTypeSymbol comparedTo)
{
var result = new TypeDiff();
result.Original = symbol;
result.ComparedTo = comparedTo;
result.MethodDifferences = symbol.GetAllContractMembers().FullOuterJoin(comparedTo.GetAllContractMembers(), SymbolComparer.Instance, (a, b) => a.CompareTo(b));
return result;
}