The GNU Fortran Compiler: Read/Write after EOF marker

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#### 6.1.19 Read/Write after EOF marker

Some legacy codes rely on allowing `READ` or `WRITE` after the EOF file marker in order to find the end of a file. GNU Fortran normally rejects these codes with a run-time error message and suggests the user consider `BACKSPACE` or `REWIND` to properly position the file before the EOF marker. As an extension, the run-time error may be disabled using -std=legacy.