Fix report-datum w/ eof #21

Extended report-datum to be friendly to eof.

read-syntax returns either a syntax or eof. This allows report-datum to be used to debug read-syntax issues.

Extended report-datum to be friendly to eof. read-syntax returns either a syntax or eof. This allows report-datum to be used to debug read-syntax issues.

Found via something like:

  (define (pfsh:read-syntax name in)
    (report-datum (read-syntax name in) 'read-syntax))

Found via something like: ```racket (define (pfsh:read-syntax name in) (report-datum (read-syntax name in) 'read-syntax)) ```

Thanks!

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Fix report-datum w/ eof #21

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