Don't skip an erroneous comma when parsing "from"

CHANGES

@@ -28,11 +28,12 @@ Version 2.10
 - Add ``min`` and ``max`` filters. (`#475`_)
 - Add tests for all comparison operators: ``eq``, ``ne``, ``lt``, ``le``,
   ``gt``, ``ge``. (`#665`_)
-- ``import`` statement cannot end with a trailing comma. (`#618`_)
+- ``import`` statement cannot end with a trailing comma. (`#617`_, `#618`_)
 
 .. _#469: https://github.com/pallets/jinja/pull/469
 .. _#475: https://github.com/pallets/jinja/pull/475
 .. _#478: https://github.com/pallets/jinja/pull/478
+.. _#617: https://github.com/pallets/jinja/pull/617
 .. _#618: https://github.com/pallets/jinja/pull/618
 .. _#665: https://github.com/pallets/jinja/pull/665
 

jinja2/parser.py

@@ -337,7 +337,6 @@ def parse_context():
                 self.stream.expect('name')
         if not hasattr(node, 'with_context'):
             node.with_context = False
-            self.stream.skip_if('comma')
         return node
 
     def parse_signature(self, node):

tests/test_imports.py

@@ -75,6 +75,12 @@ def test_trailing_comma_with_context(self, test_env):
         test_env.from_string('{% from "foo" import bar, with, context %}')
         test_env.from_string('{% from "foo" import bar, with with context %}')
 
+        with pytest.raises(TemplateSyntaxError):
+            test_env.from_string('{% from "foo" import bar,, with context %}')
+
+        with pytest.raises(TemplateSyntaxError):
+            test_env.from_string('{% from "foo" import bar with context, %}')
+
     def test_exports(self, test_env):
         m = test_env.from_string('''
             {% macro toplevel() %}...{% endmacro %}