Ignore deques (can't retrieve special methods).

3 files changed, 16 insertions, 8 deletions

diff --git a/checkers/base.py b/checkers/base.py
index afe6fd2..db5f2cc 100644
--- a/checkers/base.py
+++ b/checkers/base.py
@@ -724,7 +724,12 @@ functions, methods
                             break
                     else:
                         break
-                else:                 
+                else:             
+                    # check if it is a .deque. It doesn't seem that
+                    # we can retrieve special methods 
+                    # from C implemented constructs    
+                    if argument._proxied.qname().endswith(".deque"):
+                        return
                     self.add_message('bad-reversed-sequence', node=node)
             elif not isinstance(argument, (astroid.List, astroid.Tuple)):
                 # everything else is not a proper sequence for reversed()
diff --git a/test/input/func_bad_reversed_sequence.py b/test/input/func_bad_reversed_sequence.py
index 3bab9b9..71e9067 100644
--- a/test/input/func_bad_reversed_sequence.py
+++ b/test/input/func_bad_reversed_sequence.py
@@ -1,6 +1,8 @@
 """ Checks that reversed() receive proper argument """
 
 # pylint: disable-msg=too-few-public-methods,no-self-use,incomplete-protocol
+from collections import deque
+
 __revision__ = 0
 
 class GoodReversed(object):
@@ -45,4 +47,5 @@ def test():
     seq = reversed(range(100))
     seq = reversed(ThirdBadReversed())
     seq = reversed(lambda: None)
+    seq = reversed(deque([]))
     return seq
diff --git a/test/messages/func_bad_reversed_sequence.txt b/test/messages/func_bad_reversed_sequence.txt
index 87771ac..62792f1 100644
--- a/test/messages/func_bad_reversed_sequence.txt
+++ b/test/messages/func_bad_reversed_sequence.txt
@@ -1,8 +1,8 @@
-E: 34:test: Missing argument to reversed()

-E: 35:test: The first reversed() argument is not a sequence

-E: 38:test: The first reversed() argument is not a sequence

-E: 39:test: The first reversed() argument is not a sequence

-E: 43:test: The first reversed() argument is not a sequence

-E: 44:test: The first reversed() argument is not a sequence

+E: 36:test: Missing argument to reversed()

+E: 37:test: The first reversed() argument is not a sequence

+E: 40:test: The first reversed() argument is not a sequence

+E: 41:test: The first reversed() argument is not a sequence

+E: 45:test: The first reversed() argument is not a sequence

 E: 46:test: The first reversed() argument is not a sequence

-E: 47:test: The first reversed() argument is not a sequence
\ No newline at end of file
+E: 48:test: The first reversed() argument is not a sequence

+E: 49:test: The first reversed() argument is not a sequence
\ No newline at end of file