Make parser be able to skip tokens when encountering an unexpected token.

extern/backward.hpp

@@ -3993,9 +3993,14 @@ namespace backward {
                 st.load_here(32, reinterpret_cast<void*>(uctx), info->si_addr);
             }
 
+            std::ofstream outfile;
+            outfile.open("error.log", std::ios::out | std::ios::trunc);
+
             Printer printer;
             printer.address = true;
+            printer.print(st, outfile);
             printer.print(st, stderr);
+            outfile.close();
 
 #if _XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L
             psiginfo(info, nullptr);