From 26358e56c773a8c1e7404ea8e0fa3fb941478194 Mon Sep 17 00:00:00 2001
From: Jason Grout <jgrout6@bloomberg.net>
Date: Mon, 17 Apr 2017 15:40:39 -0400
Subject: [PATCH] Deprecate using function annotations to specify interactive
 controls.

Fixes #1264.
---
 ipywidgets/widgets/interaction.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/ipywidgets/widgets/interaction.py b/ipywidgets/widgets/interaction.py
index 92d9a4477d..c80a1a6375 100644
--- a/ipywidgets/widgets/interaction.py
+++ b/ipywidgets/widgets/interaction.py
@@ -102,6 +102,7 @@ def _yield_abbreviations_for_parameter(param, kwargs):
         if name in kwargs:
             value = kwargs.pop(name)
         elif ann is not empty:
+            warn("Using function annotations to implicitly specify interactive controls is deprecated. Use an explicit keyword argument for the parameter instead.", DeprecationWarning)
             value = ann
         elif default is not empty:
             value = default