1 files changed, 17 insertions, 4 deletions
diff --git a/astroid/bases.py b/astroid/bases.py
index 05c0ae1c..0888f063 100644
--- a/astroid/bases.py
+++ b/astroid/bases.py
@@ -283,6 +283,23 @@ class Instance(BaseInstance):
         except exceptions.AttributeInferenceError:
             return False
 
+    def getitem(self, index, context=None):
+        # TODO: Rewrap index to Const for this case
+        new_context = contextmod.bind_context_to_node(context, self)
+        if not context:
+            context = new_context
+
+        # Create a new callcontext for providing index as an argument.
+        new_context.callcontext = contextmod.CallContext(args=[index])
+
+        method = next(self.igetattr("__getitem__", context=context), None)
+        if not isinstance(method, BoundMethod):
+            raise exceptions.InferenceError(
+                "Could not find __getitem__ for {node!r}.", node=self, context=context
+            )
+
+        return next(method.infer_call_result(self, new_context))
+
     def pytype(self):
         return self._proxied.qname()
 
@@ -316,10 +333,6 @@ class Instance(BaseInstance):
                 return True
         return result
 
-    # This is set in inference.py.
-    def getitem(self, index, context=None):
-        pass
-
 
 class UnboundMethod(Proxy):
     """a special node representing a method not bound to an instance"""