The GNU Fortran Compiler: Default widths for F, G and I format descriptors

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#### 5.1.7 Default widths for `F`, `G` and `I` format descriptors

To support legacy codes, GNU Fortran allows width to be omitted from format specifications if and only if `-fdec-format-defaults` is given on the command line. Default widths will be used. This is considered non-conforming code and is discouraged.

           REAL :: value1
           INTEGER :: value2
           WRITE(*,10) value1, value1, value2
    10     FORMAT ('F, G, I')