https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88552
--- Comment #1 from G. Steinmetz <gs...@t-online.de> --- Detected : $ cat z2.f90 program p integer(len((c)) :: n end $ cat z5.f90 implicit none integer(len((c)) :: n end $ gfortran-9-20181216 -c z2.f90 -fimplicit-none z2.f90:2:14: 2 | integer(len((c)) :: n | 1 Error: Symbol 'c' at (1) has no IMPLICIT type