Smaller fixes to stuff that broke on 3.x

3 files changed, 10 insertions, 1 deletions

diff --git a/jinja2/asyncfilters.py b/jinja2/asyncfilters.py
index d12afaf4..5c1f46d7 100644
--- a/jinja2/asyncfilters.py
+++ b/jinja2/asyncfilters.py
@@ -47,6 +47,8 @@ def dualfilter(normal_filter, async_filter):
     if wrap_evalctx:
         wrapper.evalcontextfilter = True
 
+    wrapper.asyncfiltervariant = True
+
     return wrapper
 
 
diff --git a/jinja2/nodes.py b/jinja2/nodes.py
index 76f7814c..4d62cccb 100644
--- a/jinja2/nodes.py
+++ b/jinja2/nodes.py
@@ -592,6 +592,13 @@ class Filter(Expr):
         filter_ = self.environment.filters.get(self.name)
         if filter_ is None or getattr(filter_, 'contextfilter', False):
             raise Impossible()
+
+        # We cannot constant handle async filters, so we need to make sure
+        # to not go down this path.
+        if eval_ctx.environment.is_async and \
+           getattr(filter_, 'asyncfiltervariant', False):
+            raise Impossible()
+
         obj = self.node.as_const(eval_ctx)
         args = [obj] + [x.as_const(eval_ctx) for x in self.args]
         if getattr(filter_, 'evalcontextfilter', False):
diff --git a/tests/test_filters.py b/tests/test_filters.py
index 1a8a1640..2e85a9a5 100644
--- a/tests/test_filters.py
+++ b/tests/test_filters.py
@@ -581,7 +581,7 @@ class TestFilter(object):
         env = Environment(autoescape=True)
         t = env.from_string('{{ x|tojson }}')
         assert t.render(x={'foo': 'bar'}) == '{"foo": "bar"}'
-        assert t.render(x='"bar\'') == '"\"bar\u0027"'
+        assert t.render(x='"bar\'') == r'"\"bar\u0027"'
 
         def my_dumps(value, **options):
             assert options == {'foo': 'bar'}