If you had a language where that were the default behavior, it would not be insane at all (e.g., see all of mathematics,) and you probably wouldn't be able to e

If you had a language where that were the default behavior, it would not be insane at all (e.g., see all of mathematics,) and you probably wouldn't be able to even compile it the way you've written. You've set b equal to two different values.