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/GNU Fortran 10

6.1.5 Commas in FORMAT specifications

To support legacy codes, GNU Fortran allows the comma separator to be omitted immediately before and after character string edit descriptors in FORMAT statements. A comma with no following format decriptor is permited if the -fdec-blank-format-item is given on the command line. This is considered non-conforming code and is discouraged.

PRINT 10, 2, 3
10     FORMAT ('FOO='I1' BAR='I2)
       print 20, 5, 6
20     FORMAT (I3, I3,)

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https://gcc.gnu.org/onlinedocs/gcc-10.2.0/gfortran/Commas-in-FORMAT-specifications.html