fred@exodo3:~$ erl
Erlang R13A (erts-5.7) [source] [smp:2:2] [rq:2] [async-threads:0] [hipe] [kernel-poll:false]

Eshell V5.7  (abort with ^G)
1> compile:file("bug.core",[report_errors,report_warnings,from_core]).    
Function: reg/2
./bug.core:none: internal error in beam_bool;
crash reason: {{case_clause,
                   {'EXIT',
                       {function_clause,
                           [{gb_trees,get_1,[{tmp,2},nil]},
                            {beam_bool,bopt_bool_arg,2},
                            {lists,mapfoldl,3},
                            {beam_bool,bopt_tree,3},
                            {beam_bool,bopt_tree,3},
                            {beam_bool,bopt_tree_cg,3},
                            {beam_bool,bopt_block,5},
                            {beam_bool,bopt,3}]}}},
               [{compile,'-select_passes/2-anonymous-2-',2},
                {compile,'-internal_comp/4-anonymous-1-',2},
                {compile,fold_comp,3},
                {compile,internal_comp,4},
                {compile,internal,3}]}
error
2>