Fix global effects behavior upon unknown alias

Author: serge-sans-paille

pythran/analyses/global_effects.py

@@ -99,10 +99,15 @@ def visit_Call(self, node):
             func_aliases,
             list())
         for func_alias in func_aliases:
-            # special hook for boundd functions
+            # special hook for bound functions
             if isinstance(func_alias, ast.Call):
                 bound_name = func_alias.args[0].id
                 func_alias = self.global_declarations[bound_name]
+
+            # conservative choice
+            if func_alias not in self.node_to_functioneffect:
+                func_alias = intrinsic.UnboundValue
+
             func_alias = self.node_to_functioneffect[func_alias]
             self.result.add_edge(self.current_function, func_alias)
         self.generic_visit(node)

pythran/tests/test_optimizations.py

@@ -451,3 +451,20 @@ def test_importedids(self):
 
     def test_falsepoly(self):
         self.run_test("def falsepoly():\n i = 2\n if i:\n  i='ok'\n else:\n  i='lolo'\n return i", falsepoly=[])
+
+    def test_global_effects_unknown(self):
+        code = '''
+            def bb(x):
+                return x[0]()
+
+
+            def ooo(a):
+                def aa():
+                    return a
+                return aa,
+
+            def global_effects_unknown(a):
+                    return bb(ooo(a))'''
+        self.run_test(code,
+                      1,
+                      global_effects_unknown=[int])