clear warning

Readme.md

@@ -69,6 +69,7 @@ utils/local_install.sh
 
 ### TODO
 - order of arguments in functions like member and filter - filter swap lambda and list
+- add possibility to specify filename for input2 history file
 - better output of !e in repl (resp !e !ee)
 - unify -f and -run options
 - add debug support, at least call stack

ml_profiler.cpp

@@ -79,7 +79,7 @@ void MlPerfMon::restore_callstack_position(size_t to_position) {
 }
 
 void MlPerfMon::clear_callstack() {
-    call_stack.empty();
+    auto r = call_stack.empty();
 }
 
 void MlPerfMon::print_results() const {