https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70244
--- Comment #4 from simon at whiteowl dot co.uk ---
I have the same problem but with a much smaller test case (attached above):
/usr/local/bin/gfortran -c planets.f90 -v
Using built-in specs.
COLLECT_GCC=/usr/local/bin/gfortran
Target: x86_64-pc-linux-gnu
Configured with: ./configure
Thread model: posix
gcc version 8.1.0 (GCC)
COLLECT_GCC_OPTIONS='-c' '-v' '-mtune=generic' '-march=x86-64'
/usr/local/libexec/gcc/x86_64-pc-linux-gnu/8.1.0/f951 planets.f90 -quiet
-dumpbase planets.f90 -mtune=generic -march=x86-64 -auxbase planets -version
-fintrinsic-modules-path /usr/local/lib/gcc/x86_64-pc-linux-gnu/8.1.0/finclude
-o /tmp/ccy3mnd3.s
GNU Fortran (GCC) version 8.1.0 (x86_64-pc-linux-gnu)
compiled by GNU C version 8.1.0, GMP version 6.1.2, MPFR version 3.1.5,
MPC version 1.0.3, isl version none
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU Fortran2008 (GCC) version 8.1.0 (x86_64-pc-linux-gnu)
compiled by GNU C version 8.1.0, GMP version 6.1.2, MPFR version 3.1.5,
MPC version 1.0.3, isl version none
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
f951: internal compiler error: spec_dimen_size(): Bad dimension
0x5f22af gfc_internal_error(char const*, ...)
../.././gcc/fortran/error.c:1358
0x5c583b spec_dimen_size(gfc_array_spec*, int, __mpz_struct (*) [1])
../.././gcc/fortran/array.c:2174
0x656736 expression_shape
../.././gcc/fortran/resolve.c:5088
0x656736 expression_rank(gfc_expr*)
../.././gcc/fortran/resolve.c:5168
0x66323c resolve_variable
../.././gcc/fortran/resolve.c:5575
0x66323c gfc_resolve_expr(gfc_expr*)
../.././gcc/fortran/resolve.c:6721
0x659da2 gfc_resolve_code(gfc_code*, gfc_namespace*)
../.././gcc/fortran/resolve.c:11094
0x65cedf resolve_codes
../.././gcc/fortran/resolve.c:16535
0x65cfae gfc_resolve(gfc_namespace*)
../.././gcc/fortran/resolve.c:16570
0x64ae00 resolve_all_program_units
../.././gcc/fortran/parse.c:6060
0x64ae00 gfc_parse_file()
../.././gcc/fortran/parse.c:6310
0x69130f gfc_be_parse_file
../.././gcc/fortran/f95-lang.c:204
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
