Fix error when using generators with variable-length arguments

jedi/evaluate/arguments.py

@@ -29,6 +29,8 @@ def try_iter_content(types, depth=0):
 
 class AbstractArguments(object):
     context = None
+    argument_node = None
+    trailer = None
 
     def eval_argument_clinic(self, parameters):
         """Uses a list with argument clinic information (see PEP 436)."""
@@ -197,7 +199,11 @@ class TreeArguments(AbstractArguments):
                 arguments = param.var_args
                 break
 
-        return [arguments.argument_node or arguments.trailer]
+        if arguments.argument_node:
+            return [arguments.argument_node]
+        if arguments.trailer:
+            return [arguments.trailer]
+        return []
 
 
 class ValuesArguments(AbstractArguments):

test/completion/decorators.py

@@ -211,6 +211,17 @@ class X():
         #?
         self.x()
 
+
+def decorator_var_args(function, *args):
+    return function(*args)
+
+@decorator_var_args
+def function_var_args(param):
+    return param
+
+#? int()
+function_var_args(1)
+
 # -----------------
 # method decorators
 # -----------------