https://gcc.gnu.org/bugzilla/show_bug.cgi?id=49278
--- Comment #16 from Jürgen Reuter <juergen.reuter at desy dot de> --- In addition to what Tobias remarked, NAG now gives a clear error message: NAG Fortran Compiler Release 6.1(Tozai) Build 6138 Error: data.f90, line 13: Object TRLKOLD of type ACTIVE is default-initialised, therefore subobject TRLKOLD%V is not permitted in a DATA statement Intel in v18.0.1 still does not give a compilation or runtime error.