Passing keyword only args as positional should fail.

doc/build/defs.rst

@@ -73,6 +73,10 @@ value). This is in contrast to using context-level variables,
 which evaluate to ``UNDEFINED`` if you reference a name that
 does not exist.
 
+Note there is a quirk that results in a bare ``*`` being silently removed from
+a function definition. The function then incorrectly
+allows keyword only arguments to be used as positional arguments.
+
 Calling Defs from Other Files
 -----------------------------
 

test/test_def.py

@@ -62,6 +62,25 @@ def test_def_py3k_args(self):
  """look at all these args: one two three four 5 seven""",
  )
 
+ def test_def_py3k_args_quirk(self):
+ """Document quirk where bare * is silently removed which incorrectly
+ allows for kwonly args to be passed as positional.
+
+ See issue #405 for more information."""
+ template = Template(
+ """
+ <%def name="kwonly(a, *, b)">
+ hello kwonly: ${a} ${b} """
+ """
+ </%def>
+
+ ${kwonly('1', '2')}"""
+ )
+ eq_(
+ template.render().strip(),
+ """hello kwonly: 1 2""",
+ )
+
  def test_inter_def(self):
  """test defs calling each other"""
  template = Template(