https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105473
Jerry DeLisle <jvdelisle2 at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |jvdelisle2 at gmail dot com --- Comment #1 from Jerry DeLisle <jvdelisle2 at gmail dot com> --- Well, looks like we are allowing as an extension. $ gfortran -std=f95 pr105473.f90 pr105473.f90:6:27: 6 | read(testinput,*,decimal='point',iostat=ios) n | 1 Error: Fortran 2003: DECIMAL= at (1) not allowed in Fortran 95 If you set n to some value so that it is 'defined' per the standards like this: ! Does list-directed reading an integer allow some non-integer input? implicit none integer n,ios character(1):: testinput = ';' n = 999 print *,'testinput = "',testinput,'"' read(testinput,*,decimal='point',iostat=ios) n print *,'n=',n,' ios=',ios if(ios>0) print *,'testinput was not an integer' end program $ gfortran pr105473.f90 [jerry@amdr pr105473]$ ./a.out testinput = ";" n= 999 ios= 0 You will see that nothing is read into n at all. The list read is just ended.