From 7f1d5134d89aab9b3e49030676637debfd731dbb Mon Sep 17 00:00:00 2001
From: Tim Martin <tim@asymptotic.co.uk>
Date: Wed, 7 Oct 2020 18:44:48 +0100
Subject: [PATCH 1/2] Fix incorrect MRO being calculated for scoped multiple
 inheritance

If a class inherits from two bases and the classes are expressed as a
non-trivial expression such as qualified with a module name, classes
after the first could not be inferred due to reusing the context
object in _inferred_bases
---
 ChangeLog                      |  4 ++++
 astroid/scoped_nodes.py        |  2 +-
 tests/unittest_scoped_nodes.py | 24 ++++++++++++++++++++++++
 3 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index f42649356..86c6deee8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -53,6 +53,10 @@ Release Date: TBA
 
 * Fixed exception-chaining error messages.
 
+* Fix failure to infer base class type with multiple inheritance and qualified names
+
+  Fixes #843
+
 
 What's New in astroid 2.4.3?
 ============================
diff --git a/astroid/scoped_nodes.py b/astroid/scoped_nodes.py
index 5c9419668..a44e6282e 100644
--- a/astroid/scoped_nodes.py
+++ b/astroid/scoped_nodes.py
@@ -2858,7 +2858,7 @@ def _inferred_bases(self, context=None):
 
         for stmt in self.bases:
             try:
-                baseobj = next(stmt.infer(context=context))
+                baseobj = next(stmt.infer(context=context.clone()))
             except exceptions.InferenceError:
                 continue
             if isinstance(baseobj, bases.Instance):
diff --git a/tests/unittest_scoped_nodes.py b/tests/unittest_scoped_nodes.py
index c4597fa68..2606fd47a 100644
--- a/tests/unittest_scoped_nodes.py
+++ b/tests/unittest_scoped_nodes.py
@@ -1417,6 +1417,30 @@ def __init__(self):
             ],
         )
 
+    def test_mro_with_attribute_classes(self):
+        cls = builder.extract_node(
+            """
+        class A:
+            pass
+        class B:
+            pass
+        scope = object()
+        scope.A = A
+        scope.B = B
+        class C(scope.A, scope.B):
+            pass
+        """
+        )
+        self.assertEqualMro(
+            cls,
+            [
+                "C",
+                "A",
+                "B",
+                "object"
+            ]
+        )
+
     def test_generator_from_infer_call_result_parent(self):
         func = builder.extract_node(
             """

From c89dc0102bfe7a6e72b21e213742bdb982b438cc Mon Sep 17 00:00:00 2001
From: Tim Martin <tim@asymptotic.co.uk>
Date: Fri, 16 Oct 2020 10:36:30 +0100
Subject: [PATCH 2/2] Fix formatting regression

---
 tests/unittest_scoped_nodes.py | 10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

diff --git a/tests/unittest_scoped_nodes.py b/tests/unittest_scoped_nodes.py
index 2606fd47a..aef1a671f 100644
--- a/tests/unittest_scoped_nodes.py
+++ b/tests/unittest_scoped_nodes.py
@@ -1431,15 +1431,7 @@ class C(scope.A, scope.B):
             pass
         """
         )
-        self.assertEqualMro(
-            cls,
-            [
-                "C",
-                "A",
-                "B",
-                "object"
-            ]
-        )
+        self.assertEqualMro(cls, ["C", "A", "B", "object"])
 
     def test_generator_from_infer_call_result_parent(self):
         func = builder.extract_node(