(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)))
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