StacktraceTop:std::string::append (this=0x7fff223e1770, __str=@0x2885578) std::operator+<char, std::char_traits<char>, std::allocator<char> > (__lhs=<value optimized out>, __rhs=@0x2885578) place_call_cb (data=<value optimized out>) IA__g_closure_invoke (closure=0x273b800, signal_emit_unlocked_R (node=0x2715890, detail=0,
StacktraceTop: std::string: :append (this=0x7fff223 e1770, __str=@0x2885578) <char, std::char_ traits< char>, std::allocator< char> > (__lhs=<value optimized out>, __rhs=@0x2885578) invoke (closure=0x273b800, emit_unlocked_ R (node=0x2715890, detail=0,
std::operator+
place_call_cb (data=<value optimized out>)
IA__g_closure_
signal_