https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84955
--- Comment #1 from G. Steinmetz <gs...@t-online.de> ---
Configured with --enable-checking=yes :
$ gfortran-8-20180318 -c z1.f90 -O2 -fopenacc
during GIMPLE pass: fixup_cfg
z1.f90:11:0:
end
internal compiler error: in operator[], at vec.h:841
0xd2490f vec<edge_def*, va_gc, vl_embed>::operator[](unsigned int)
../../gcc/vec.h:841
0xd2490f extract_true_false_edges_from_block(basic_block_def*, edge_def**,
edge_def**)
../../gcc/tree-cfg.c:9194
0xd29e5d gimple_verify_flow_info
../../gcc/tree-cfg.c:5740
0x87aeb3 verify_flow_info()
../../gcc/cfghooks.c:263
0xc09a71 execute_function_todo
../../gcc/passes.c:2006
0xc0a499 execute_todo
../../gcc/passes.c:2048
