reorder var_args if named arguments are in front of *args.

jedi/evaluate/param.py

@@ -197,7 +197,7 @@ def _unpack_var_args(evaluator, var_args, func):
         argument_list.append((None, [helpers.FakeStatement([func.instance])]))
 
     # `var_args` is typically an Array, and not a list.
-    for stmt in var_args:
+    for stmt in _reorder_var_args(var_args):
         if not isinstance(stmt, pr.Statement):
             if stmt is None:
                 argument_list.append((None, []))
@@ -260,6 +260,28 @@ def _unpack_var_args(evaluator, var_args, func):
     return argument_list
 
 
+def _reorder_var_args(var_args):
+    """
+    Reordering var_args is necessary, because star args sometimes appear after
+    named argument, but in the actual order it's prepended.
+    """
+    named_index = None
+    new_args = []
+    for i, stmt in enumerate(var_args):
+        if named_index is None and stmt.assignment_details:
+            named_index = i
+
+        if named_index is not None:
+            expression_list = stmt.expression_list()
+            if expression_list and expression_list[0] == '*':
+                new_args.insert(named_index, stmt)
+                named_index += 1
+                continue
+
+        new_args.append(stmt)
+    return new_args
+
+
 def _iterate_star_args(evaluator, array, expression_list, func):
     from jedi.evaluate.representation import Instance
     if isinstance(array, iterable.Array):

test/static_analysis/star_arguments.py

@@ -32,6 +32,12 @@ nested_twice(2)
 #! 19 type-error-too-many-arguments
 nested_twice(2, 3, 4)
 
+
+# A named argument can be located before *args.
+def star_args_with_named(*args):
+    return simple2(c='', *args)
+
+star_args_with_named(1, 2)
 # -----------------
 # **kwargs
 # -----------------