prompt-toolkit hanging

anki-code

Hi! I'm trying to run prompt-toolkit (the main prompt engine for xonsh shell) and facing with hanging:

# rustpython v0.4.0 (https://github.com/RustPython/RustPython#ebdc033c)
rustpython -m pip install prompt-toolkit

ptk.py:

from prompt_toolkit import prompt
text = prompt("Say something: ")
print("You said:", text)

Run:

~/.cargo/bin/rustpython ptk.py
# Hanging