https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77533
--- Comment #1 from Gerhard Steinmetz <gerhard.steinmetz.fort...@t-online.de> --- Sidenote : one message mentions a "KIND = 0". $ cat z3.f90 module m type t contains procedure :: s generic :: write(formatted) => s end type contains subroutine s(x) class(t), intent(in) : x end end $ gfortran-7-20160904 z3.f90 z3.f90:9:15: class(t), intent(in) : x 1 Error: Invalid character in name at (1) z3.f90:4:15: procedure :: s 1 Error: Non-polymorphic passed-object dummy argument of 's' at (1) z3.f90:8:17: subroutine s(x) 1 Error: DTIO dummy argument at (1) must be of type CLASS z3.f90:8:17: subroutine s(x) 1 Error: DTIO dummy argument at (1) must be of KIND = 0 z3.f90:8:17: subroutine s(x) 1 Error: DTIO dummy argument at (1) must have intent IN