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There are three kinds of diagnostic messages:
The messages produced by fpp are intended to be self-explanatory.
The line number and filename where the error occurred are printed
along with the diagnostic.
preprocessing of source code is continued and
the return value remains to be 0.
Fpp continues preprocessing but sets the return code to a nonzero value, namely
the number of errors.
Fpp cancels preprocessing and returns a nonzero return value.