[plt-scheme] get-uncovered-expressions always returns () ?

From: John Clements (clements at brinckerhoff.org)
Date: Tue Jan 19 19:06:03 EST 2010

I'm having no luck in persuading the coverage-tester to work in scheme/sandbox.

Specifically, I observe about this program:

#lang scheme

(require scheme/sandbox)

(define stx-placeholder #'abc)

(define to-be-evaluated
   `(module user lang/htdp-beginner
      (require schemeunit/check)
      (define (f x) (+ 3 x)))

(define evaluator
  (parameterize ([sandbox-output 'string]
                 [sandbox-coverage-enabled #t])

(evaluator '3)

(get-uncovered-expressions evaluator #f
                           ;#t (syntax-source stx-placeholder)

a) it's about the simplest use of get-uncovered-expressions, and
b) it's not working. Specifically, the call to get-uncovered-expressions
  produces (), when it appears to me that it shouldn't (in that the function 'f'
  is never called.

Please let me know if I'm mistaken about either (or both!) of these observations.

(FWIW, this is; perhaps an update would help?)


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