Working with a student in DrRacket for the first time in a while.

I notice that in BSL, an error in a function does not tell you what input
to the function caused the error, nor does it show the stack trace by
drawing arrows in the definitions window the way I remember.

When did this behavior change? Is there a way to turn on better error
reporting and stack traces?

Example:

(define (reciprocal n)
  (/ 1 n))

(define (sub2 n)
  (- n 2))

(define a (reciprocal (sub2 2)))

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