https://community.intel.com/t5/Intel-Fortran-Compiler/Error-in-compile/m-p/1733440#M178013 <LI-CODE lang="markup">write(*,9)</LI-CODE><P>&nbsp;</P><P>where 9 is an undefined format does not throw an error or warning.&nbsp; I had a stack drawing a straight line in the output, deleted 9 and it all kept compiling, pretty sure that is not a good idea.</P><P>Whoever said arithmetic if's are a bad idea is a Fortran Saint now.&nbsp;</P> Tue, 13 Jan 2026 23:57:03 GMT JohnNichols 2026-01-13T23:57:03Z https://community.intel.com/t5/Intel-Fortran-Compiler/Error-in-compile/m-p/1733440#M178013 <LI-CODE lang="markup">write(*,9)</LI-CODE><P>&nbsp;</P><P>where 9 is an undefined format does not throw an error or warning.&nbsp; I had a stack drawing a straight line in the output, deleted 9 and it all kept compiling, pretty sure that is not a good idea.</P><P>Whoever said arithmetic if's are a bad idea is a Fortran Saint now.&nbsp;</P> Tue, 13 Jan 2026 23:57:03 GMT https://community.intel.com/t5/Intel-Fortran-Compiler/Error-in-compile/m-p/1733440#M178013 JohnNichols 2026-01-13T23:57:03Z https://community.intel.com/t5/Intel-Fortran-Compiler/Error-in-compile/m-p/1733448#M178014 <LI-CODE lang="none">t.f90(1): error #6052: This label has not been defined as a FORMAT label. [9] write(*,9) --------^ compilation aborted for t.f90 (code 1) D:\Projects&gt;</LI-CODE><P>How about providing a compilable source that reproduces the problem? These minimal snippets waste everyone's time.</P> Wed, 14 Jan 2026 01:40:38 GMT https://community.intel.com/t5/Intel-Fortran-Compiler/Error-in-compile/m-p/1733448#M178014 Steve_Lionel 2026-01-14T01:40:38Z