Smaller fixes to stuff that broke on 3.x

2 files changed, 9 insertions, 0 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):