Absolutely! NEVER coast! This is illegal and dangerous. Coasting does NOT save petrol! It uses more petrol. You lose control of the vehicle, increase the chance of a skid and if you were being evaluated, that would be an instant fail. This is a HUGE pet peeve of mine! I make sure my pupils never do this. The way I teach, coasting is not possible. This is why tell people to look up 'dvsa rule 122'. This is a clear explanation of why NOT to coast. No matter what country you live in, this applies.
Coasting when you are in second gear to a stop is fine. You are already going slow.
You know I do NOT nor advocate coasting from a higher speed. As an ADI, I must do and follow the laws. Some on this site will do and advocate coasting. I cannot imagine why doing this. I will NOT do this, ever.
I answered the question and stated why I do and feel the way I do. I may get flamed by some for my post. Asbestos suit is on. No attack in any way to the poster. He is asking a question to get answers. A good question for anyone else who may wonder about this.
I will tell anyone the proper way to stop from a higher speed if asked.