Show better description to users when std::bad_alloc happens

src/script/common/c_internal.cpp

@@ -42,7 +42,8 @@ int script_exception_wrapper(lua_State *L, lua_CFunction f)
 	} catch (const char *s) {  // Catch and convert exceptions.
 		lua_pushstring(L, s);
 	} catch (std::exception &e) {
-		lua_pushstring(L, e.what());
+		std::string e_descr = debug_describe_exc(e);
+		lua_pushlstring(L, e_descr.c_str(), e_descr.size());
 	}
 	return lua_error(L);  // Rethrow as a Lua error.
 }