Add support for indexing containers with instances which provides an __index__ returning-int method.

This patch moves _class_as_index to helpers, where it becames class_instance_as_index.
Also, it instantiates its own call context, which makes certain idioms with lambdas
to work.

1 files changed, 3 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 2026199..88e4aa2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -210,6 +210,9 @@ Change log for the astroid package (used to be astng)
     * Add support for multiplication of tuples and lists with instances
       which provides an __index__ returning-int method.
 
+    * Add support for indexing containers with instances which provides
+      an __index__ returning-int method.
+
     * Star unpacking in assignments returns properly a list,
       not the individual components. Closes issue #138.