#0  0x00007ffff544926b in std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::string const&) ()
   from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#1  0x00007ffff7274ab8 in std::pair<std::string const, octave_value>::pair (
    this=0xfba0f0) at /usr/include/c++/4.9/bits/stl_pair.h:127
#2  0x00007ffff7274b42 in __gnu_cxx::new_allocator<std::_Rb_tree_node<std::pair<std::string const, octave_value> > >::construct<std::pair<std::string const, octave_value><std::pair<std::string const, octave_value> const&> > (
    this=0xfba098, __p=0xfba0f0)
    at /usr/include/c++/4.9/ext/new_allocator.h:120
#3  0x00007ffff72743fe in std::allocator_traits<std::allocator<std::_Rb_tree_node<std::pair<std::string const, octave_value> > > >::_S_construct<std::pair<std::string const, octave_value><std::pair<std::string const, octave_value> const&> >(std::allocator<std::_Rb_tree_node<std::pair<std::string const, octave_value> > >&, std::allocator_traits<std::allocator<std::_Rb_tree_node<std::pair<std::string const, octave_value> > > >::__construct_helper*, (std::pair<std::string const, octave_value><std::pair<std::string const, octave_value> const&>&&)...) (
    __a=..., __p=0xfba0f0) at /usr/include/c++/4.9/bits/alloc_traits.h:253
#4  0x00007ffff7273772 in std::allocator_traits<std::allocator<std::_Rb_tree_node<std::pair<std::string const, octave_value> > > >::construct<std::pair<std::string const, octave_value><std::pair<std::string const, octave_value> const&> >(std::allocator<std::_Rb_tree_node<std::pair<std::string const, octave_value> > >&, std::pair<std::string const, octave_value><std::pair<std::string const, octave_value> const&>*, (std::pair<std::string const, octave_value><std::pair<std::string const, octave_value> const&>&&)...) (__a=..., __p=0xfba0f0)
    at /usr/include/c++/4.9/bits/alloc_traits.h:399
#5  0x00007ffff727280e in std::_Rb_tree<std::string, std::pair<std::string const, octave_value>, std::_Select1st<std::pair<std::string const, octave_value> >, std::less<std::string>, std::allocator<std::pair<std::string const, octave_value> > >::_M_create_node<std::pair<std::string const, octave_value> const&> (
    this=0xfba098) at /usr/include/c++/4.9/bits/stl_tree.h:421
#6  0x00007ffff72703cc in std::_Rb_tree<std::string, std::pair<std::string const, octave_value>, std::_Select1st<std::pair<std::string const, octave_value> >, std::less<std::string>, std::allocator<std::pair<std::string const, octave_value> > >::_M_clone_node (this=0xfba098, __x=0xf9dcf0)
    at /usr/include/c++/4.9/bits/stl_tree.h:445
#7  0x00007ffff726bd66 in std::_Rb_tree<std::string, std::pair<std::string const, octave_value>, std::_Select1st<std::pair<std::string const, octave_value> >, std::less<std::string>, std::allocator<std::pair<std::string const, octave_value> > >::_M_copy (this=0xfba098, __x=0xf9dcf0, __p=0xfba0a0)
    at /usr/include/c++/4.9/bits/stl_tree.h:1207
#8  0x00007fffdac119d5 in _Rb_tree (__x=..., this=0xfba098)
    at /usr/include/c++/4.9/bits/stl_tree.h:676
#9  map (__x=std::map with 140737351431952 elements, this=0xfba098)
    at /usr/include/c++/4.9/bits/stl_map.h:183
#10 pair (this=0xfba090) at /usr/include/c++/4.9/bits/stl_pair.h:96
#11 construct (this=<optimized out>, __val=..., __p=0xfba090)
    at /usr/include/c++/4.9/ext/new_allocator.h:130
#12 _M_create_node (this=0x7ffff7dd72a0 <root_figure::factory_properties>, 
    __x=...) at /usr/include/c++/4.9/bits/stl_tree.h:397
#13 _M_clone_node (this=0x7ffff7dd72a0 <root_figure::factory_properties>, 
    __x=0xf76c20) at /usr/include/c++/4.9/bits/stl_tree.h:445
#14 std::_Rb_tree<std::string, std::pair<std::string const, std::map<std::string, octave_value, std::less<std::string>, std::allocator<std::pair<std::string const, octave_value> > > >, std::_Select1st<std::pair<std::string const, std::map<std::string, octave_value, std::less<std::string>, std::allocator<std::pair<std::string const, octave_value> > > > >, std::less<std::string>, std::allocator<std::pair<std::string const, std::map<std::string, octave_value, std::less<std::string>, std::allocator<std::pair<std::string const, octave_value> > > > > >::_M_copy (address@hidden <root_figure::factory_properties>, 
    __x=0xf76c20, 
    address@hidden <root_figure::factory_properties+8>)
    at /usr/include/c++/4.9/bits/stl_tree.h:1207
#15 0x00007fffda36456b in _Rb_tree (__x=..., 
    this=0x7fffdb3cf860 <root_figure::factory_properties>)
    at /usr/include/c++/4.9/bits/stl_tree.h:676
#16 map (__x=std::map with 17 elements, 
    this=0x7fffdb3cf860 <root_figure::factory_properties>)
    at /usr/include/c++/4.9/bits/stl_map.h:183
#17 property_list (m=std::map with 17 elements, 
    this=0x7fffdb3cf860 <root_figure::factory_properties>)
    at corefcn/graphics.h:2007
#18 __static_initialization_and_destruction_0 (__initialize_p=1, 
    __priority=65535) at corefcn/graphics.cc:3221
#19 _GLOBAL__sub_I_graphics.cc(void) () at corefcn/graphics.cc:10565
#20 0x00007ffff7dea9ba in call_init (l=<optimized out>, address@hidden, 
    address@hidden, address@hidden) at dl-init.c:78
#21 0x00007ffff7deaaa3 in call_init (env=0x6675d0, argv=0x7fffffffe408, 
    argc=1, l=<optimized out>) at dl-init.c:36
#22 _dl_init (address@hidden, argc=1, argv=0x7fffffffe408, 
    env=0x6675d0) at dl-init.c:126
#23 0x00007ffff7deec08 in dl_open_worker (address@hidden)
    at dl-open.c:577
#24 0x00007ffff7dea874 in _dl_catch_error (
    address@hidden, 
    address@hidden, 
    address@hidden, 
    address@hidden <dl_open_worker>, 
#25 0x00007ffff7dee3fb in _dl_open (
    file=0xa7e2c8 "/home/olaf/octave/optiminterp-0.3.5/x86_64-pc-linux-gnu-api-v51/optiminterp.oct", mode=-2147483390, caller_dlopen=<optimized out>, nsid=-2, 
    argc=1, argv=0x7fffffffe408, env=0x6675d0) at dl-open.c:661
#26 0x00007fffef0ff02b in dlopen_doit (address@hidden) at dlopen.c:66
#27 0x00007ffff7dea874 in _dl_catch_error (objname=0x7f3f60, 
    errstring=0x7f3f68, mallocedp=0x7f3f58, 
    operate=0x7fffef0fefd0 <dlopen_doit>, args=0x7fffffff47d0)
    at dl-error.c:187
#28 0x00007fffef0ff5dd in _dlerror_run (
    address@hidden <dlopen_doit>, 
    address@hidden) at dlerror.c:163
#29 0x00007fffef0ff0c1 in __dlopen (file=<optimized out>, mode=<optimized out>)
    at dlopen.c:87
#30 0x00007ffff63fe9c0 in octave::octave_dlopen_shlib::octave_dlopen_shlib (
    this=0x764150, 
    f="/home/olaf/octave/optiminterp-0.3.5/x86_64-pc-linux-gnu-api-v51/optiminterp.oct") at liboctave/util/oct-shlib.cc:208
#31 0x00007ffff63fec3d in octave::dynamic_library::dynlib_rep::new_instance (
    f="/home/olaf/octave/optiminterp-0.3.5/x86_64-pc-linux-gnu-api-v51/optiminterp.oct") at liboctave/util/oct-shlib.cc:520
#32 0x00007ffff63fe768 in octave::dynamic_library::dynlib_rep::get_instance (
    f="/home/olaf/octave/optiminterp-0.3.5/x86_64-pc-linux-gnu-api-v51/optiminterp.oct", fake=true) at liboctave/util/oct-shlib.cc:112
#33 0x00007ffff72d40b9 in octave::dynamic_library::dynamic_library (
    this=0x7fffffff48f0, 
    f="/home/olaf/octave/optiminterp-0.3.5/x86_64-pc-linux-gnu-api-v51/optiminterp.oct", fake=true) at ./liboctave/util/oct-shlib.h:120
#34 0x00007ffff74dd8e3 in octave::dynamic_library::open (this=0x7fffffff49a0, 
    f="/home/olaf/octave/optiminterp-0.3.5/x86_64-pc-linux-gnu-api-v51/optiminterp.oct") at ./liboctave/util/oct-shlib.h:154
#35 0x00007ffff74dd0d8 in octave_dynamic_loader::do_load_oct (this=0x7a7880, 
    fcn_name="optiminterp", 
    file_name="/home/olaf/octave/optiminterp-0.3.5/x86_64-pc-linux-gnu-api-v51/optiminterp.oct", relative=false) at libinterp/corefcn/dynamic-ld.cc:264
#36 0x00007ffff74dd5ba in octave_dynamic_loader::load_oct (
    fcn_name="optiminterp", 
    file_name="/home/olaf/octave/optiminterp-0.3.5/x86_64-pc-linux-gnu-api-v51/optiminterp.oct", relative=false) at libinterp/corefcn/dynamic-ld.cc:403
#37 0x00007ffff73a0c3b in load_fcn_from_file (
    file_name="/home/olaf/octave/optiminterp-0.3.5/x86_64-pc-linux-gnu-api-v51/optiminterp.oct", 
    dir_name="/home/olaf/octave/optiminterp-0.3.5/x86_64-pc-linux-gnu-api-v51", dispatch_type="", package_name="", fcn_name="", autoload=false)
    at libinterp/parse-tree/oct-parse.yy:4374
#38 0x00007ffff7816b27 in symbol_table::fcn_info::fcn_info_rep::find_user_function (this=0x77c8b0) at libinterp/corefcn/symtab.cc:1093
#39 0x00007ffff78142a0 in symbol_table::fcn_info::fcn_info_rep::load_class_constructor (this=0x77c8b0) at libinterp/corefcn/symtab.cc:453
#40 0x00007ffff7815873 in symbol_table::fcn_info::fcn_info_rep::xfind (
    this=0x77c8b0, args=..., local_funcs=true)
    at libinterp/corefcn/symtab.cc:804
#41 0x00007ffff781532e in symbol_table::fcn_info::fcn_info_rep::find (
    this=0x77c8b0, args=..., local_funcs=true)
    at libinterp/corefcn/symtab.cc:703
#42 0x00007ffff781b004 in symbol_table::fcn_info::find (this=0x7fffffff5010, 
    args=..., local_funcs=true) at libinterp/corefcn/symtab.h:1020
#43 0x00007ffff7818c4d in symbol_table::do_find (this=0xe6af50, 
    name="optiminterp", args=..., skip_variables=true, local_funcs=true)
    at libinterp/corefcn/symtab.cc:1503
#44 0x00007ffff7817a04 in symbol_table::find (name="optiminterp", args=..., 
    skip_variables=true, local_funcs=true) at libinterp/corefcn/symtab.cc:1264
#45 0x00007ffff7817cbb in symbol_table::find_function (name="optiminterp", 
    args=..., local_funcs=true) at libinterp/corefcn/symtab.cc:1300
#46 0x00007ffff76bb967 in raw_help_from_symbol_table (nm="optiminterp", h="", 
    w="", address@hidden: false) at libinterp/corefcn/help.cc:309
#47 0x00007ffff76bc3be in raw_help (nm="optiminterp", 
    address@hidden: false) at libinterp/corefcn/help.cc:483
#48 0x00007ffff76bc607 in do_get_help_text (name="optiminterp", text="", 
    format="") at libinterp/corefcn/help.cc:531
#49 0x00007ffff76bc79d in Fget_help_text (args=...)
    at libinterp/corefcn/help.cc:575
#50 0x00007ffff7211b3b in octave_builtin::do_multi_index_op (this=0x6c0390, 
    nargout=2, args=..., lvalue_list=0x7fffffff5d80)
    at libinterp/octave-value/ov-builtin.cc:126
#51 0x00007ffff7211832 in octave_builtin::subsref (this=0x6c0390, type="(", 
    idx=std::list, nargout=2, lvalue_list=0x7fffffff5d80)
    at libinterp/octave-value/ov-builtin.cc:64
#52 0x00007ffff73147df in octave_value::subsref (this=0x7fffffff5850, 
    type="(", idx=std::list, nargout=2, lvalue_list=0x7fffffff5d80)
    at libinterp/octave-value/ov.cc:1456
#53 0x00007ffff73c69ce in tree_index_expression::rvalue (this=0xe6eba0, 
    nargout=2, lvalue_list=0x7fffffff5d80)
    at libinterp/parse-tree/pt-idx.cc:428
#54 0x00007ffff73b432d in tree_multi_assignment::rvalue (this=0xe6edc0)
    at libinterp/parse-tree/pt-assign.cc:210
#55 0x00007ffff73b4168 in tree_multi_assignment::rvalue1 (this=0xe6edc0, 
...