[racket] Exception not being caught?

My eyes were deceiving me. Sorry about that. 

Sent from my iPhone

On Sep 4, 2012, at 10:53 AM, Tobias Hammer <tobias.hammer at dlr.de> wrote:

> 
>>> (sudoku)
>> Cannot open file /Users/gregwoodhouse/sudoku/puzzles/puzzle-4a.sdk
>> #(struct:exn:fail:filesystem call-with-input-file: cannot open input file
>>  path: /Users/gregwoodhouse/sudoku/puzzles/puzzle-4a.sdk
>>  system error: Permission denied; errno=13 #<continuation-mark-set>)
> 
> and
> 
>>      (with-handlers
>>          ((exn:fail:filesystem?
>>            (lambda (exn)
>>              (printf " Cannot open file ~a~n~a~n" fname exn)))
> 
> match perfectly