System.Linq.Expressions.Expression.ValidateUserDefinedConditionalLogicOperator C# (CSharp) Method

        private static void ValidateUserDefinedConditionalLogicOperator(ExpressionType nodeType, Type left, Type right, MethodInfo method)
        {
            ValidateOperator(method);
            ParameterInfo[] pms = method.GetParametersCached();
            if (pms.Length != 2)
                throw Error.IncorrectNumberOfMethodCallArguments(method, nameof(method));
            if (!ParameterIsAssignable(pms[0], left))
            {
                if (!(left.IsNullableType() && ParameterIsAssignable(pms[0], left.GetNonNullableType())))
                    throw Error.OperandTypesDoNotMatchParameters(nodeType, method.Name);
            }
            if (!ParameterIsAssignable(pms[1], right))
            {
                if (!(right.IsNullableType() && ParameterIsAssignable(pms[1], right.GetNonNullableType())))
                    throw Error.OperandTypesDoNotMatchParameters(nodeType, method.Name);
            }
            if (pms[0].ParameterType != pms[1].ParameterType)
            {
                throw Error.UserDefinedOpMustHaveConsistentTypes(nodeType, method.Name);
            }
            if (method.ReturnType != pms[0].ParameterType)
            {
                throw Error.UserDefinedOpMustHaveConsistentTypes(nodeType, method.Name);
            }
            if (IsValidLiftedConditionalLogicalOperator(left, right, pms))
            {
                left = left.GetNonNullableType();
            }
            MethodInfo opTrue = TypeUtils.GetBooleanOperator(method.DeclaringType, "op_True");
            MethodInfo opFalse = TypeUtils.GetBooleanOperator(method.DeclaringType, "op_False");
            if (opTrue == null || opTrue.ReturnType != typeof(bool) ||
                opFalse == null || opFalse.ReturnType != typeof(bool))
            {
                throw Error.LogicalOperatorMustHaveBooleanOperators(nodeType, method.Name);
            }
            VerifyOpTrueFalse(nodeType, left, opFalse, nameof(method));
            VerifyOpTrueFalse(nodeType, left, opTrue, nameof(method));
        }