check_file(file) is rather ambiguous about its output. It
only states that it checks a file for misspelled words. If I
had felt mean, I would have assumed that it did exactly what
part uno was asking for. 

check_text(text) suffers from the same problem. 

The more literal functions for tokenizing and file reading
and single word checking were fine, so I used those. I
assumed read_dictionary took the string representing a
filename.