Improve all_functions_called

slither/core/declarations/contract.py

@@ -191,7 +191,7 @@ def all_functions_called(self):
         '''
             list(Function): List of functions reachable from the contract (include super)
         '''
-        all_calls = [f.all_internal_calls() for f in self.functions + self.modifiers]
+        all_calls = [f.all_internal_calls() for f in self.functions + self.modifiers] + [self.functions + self.modifiers]
         all_calls = [item for sublist in all_calls for item in sublist] + self.functions
         all_calls = list(set(all_calls))