https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119856
--- Comment #7 from Walter Spector <w6ws at earthlink dot net> --- Confirmed that the compiler now diagnoses the missing commas. Thanks! As noted in Comment 1, there is no message at run-time for run-time formats: $ cat badfmt2.f90 program badfmt implicit none character(10):: fmt = "(AI5)" ! Not parameter, so not examined at compile time integer :: ioerr write (*, fmt, iostat=ioerr) 'value =', 42 print *, 'ioerr =', ioerr write (*, fmt) 'value =', 43 end program badfmt $ $ gfortran badfmt2.f90 $ ./a.out value = 42 ioerr = 0 value = 43 $ $ gfortran --std=f95 badfmt2.f90 $ ./a.out value = 42 ioerr = 0 value = 43 $ $ gfortran --version GNU Fortran (GCC) 16.0.0 20250529 (experimental) Copyright (C) 2025 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. $
