diff --git a/jinja2/exceptions.py b/jinja2/exceptions.py
index 0bbe33e..b0853c4 100644
--- a/jinja2/exceptions.py
+++ b/jinja2/exceptions.py
@@ -45,3 +45,9 @@
 
 class TemplateRuntimeError(TemplateError):
     """A runtime error."""
+
+
+class FilterArgumentError(Exception):
+    """This error is raised if a filter was called with inappropriate
+    arguments
+    """
diff --git a/jinja2/ext.py b/jinja2/ext.py
index 5ae317d..1158505 100644
--- a/jinja2/ext.py
+++ b/jinja2/ext.py
@@ -15,7 +15,7 @@
 from jinja2.environment import get_spontaneous_environment
 from jinja2.runtime import Undefined, concat
 from jinja2.parser import statement_end_tokens
-from jinja2.exceptions import TemplateAssertionError
+from jinja2.exceptions import TemplateAssertionError, TemplateSyntaxError
 from jinja2.utils import import_string, Markup
 
 
diff --git a/jinja2/filters.py b/jinja2/filters.py
index 4c9766c..0b55760 100644
--- a/jinja2/filters.py
+++ b/jinja2/filters.py
@@ -19,6 +19,7 @@
 from itertools import imap, groupby
 from jinja2.utils import Markup, escape, pformat, urlize, soft_unicode
 from jinja2.runtime import Undefined
+from jinja2.exceptions import FilterArgumentError
 
 
 _striptags_re = re.compile(r'(<!--.*?-->|<[^>]*>)')
diff --git a/jinja2/nodes.py b/jinja2/nodes.py
index f87bbb8..c1231ea 100644
--- a/jinja2/nodes.py
+++ b/jinja2/nodes.py
@@ -504,7 +504,8 @@
         if self.ctx != 'load':
             raise Impossible()
         try:
-            return environmen.subscribe(self.node.as_const(), self.arg.as_const())
+            return self.environment.subscribe(self.node.as_const(),
+                                              self.arg.as_const())
         except:
             raise Impossible()
 
diff --git a/jinja2/parser.py b/jinja2/parser.py
index 8bc1307..f225ab3 100644
--- a/jinja2/parser.py
+++ b/jinja2/parser.py
@@ -535,7 +535,7 @@
             if len(args) == 1:
                 arg = args[0]
             else:
-                arg = nodes.Tuple(args, lineno, self.filename)
+                arg = nodes.Tuple(args, self.lineno, self.filename)
         else:
             raise TemplateSyntaxError('expected subscript expression',
                                       self.lineno, self.filename)
diff --git a/jinja2/utils.py b/jinja2/utils.py
index 639cda6..0704bb4 100644
--- a/jinja2/utils.py
+++ b/jinja2/utils.py
@@ -412,7 +412,7 @@
     from functools import partial
 except ImportError:
     class partial(object):
-        def __init__(self, _func, *args, **kwargs):
+        def __init__(self, func, *args, **kwargs):
             self._func = func
             self._args = args
             self._kwargs = kwargs