diff -r dcf9e9ae5393 -r 2eacb34be5a0 Lib/asyncio/coroutines.py
--- a/Lib/asyncio/coroutines.py	Wed Dec 23 00:37:50 2015 +0200
+++ b/Lib/asyncio/coroutines.py	Wed Dec 23 00:47:22 2015 -0600
@@ -243,8 +243,11 @@
 
 def iscoroutinefunction(func):
     """Return True if func is a decorated coroutine function."""
-    return (getattr(func, '_is_coroutine', False) or
-            _inspect_iscoroutinefunction(func))
+    return_value = False
+    if inspect.isfunction(func) or inspect.ismethod(func):
+        return_value = (getattr(func, '_is_coroutine', False) or
+                _inspect_iscoroutinefunction(func))
+    return return_value
 
 
 _COROUTINE_TYPES = (types.GeneratorType, CoroWrapper)