A student's question

My teacher keeps drilling into our collective heads that using the break command is harmful, and that if we wish to terminate a loop early it would be far better to create a boolean variable, set it to 0, and add a condition to the head of the loop, and set the boolean variable to 1 when a break is needed. Note that this way you actually have to check this every single loop (where it is not needed almost every time) as well as waste a command to reset the boolean in case it was set to true.

Is there a reason to this?

>>69
for compile-time inner macros inside the custom-defun and runtime?
Can you do following in Scheme/Racket?

(defparameter *current-function* nil)

(defmacro custom-defun (name args &rest body &environment env)
  (let ((*current-function* name))
    `(defun ,name ,args
       ,@(mapcar (lambda (x) (sb-cltl2:macroexpand-all x env)) body))))

(defmacro this-function ()
  `',*current-function*)