Fix prompt for alice/faber demo

Signed-off-by: Ian Costanzo <[email protected]>

demo/runners/support/utils.py

@@ -7,6 +7,7 @@
 import prompt_toolkit
 import pygments
 from prompt_toolkit.application import run_in_terminal
+from prompt_toolkit.eventloop.defaults import use_asyncio_event_loop
 from prompt_toolkit.formatted_text import FormattedText, PygmentsTokens
 from prompt_toolkit.patch_stdout import patch_stdout
 from prompt_toolkit.shortcuts import ProgressBar
@@ -141,7 +142,15 @@ def flatten(args):
             yield arg
 
 
+def prompt_init():
+    if hasattr(prompt_init, "_called"):
+        return
+    prompt_init._called = True
+    use_asyncio_event_loop()
+
+
 async def prompt(*args, **kwargs):
+    prompt_init()
     with patch_stdout():
         try:
             while True: