Consider the following code ```python3 $ ./gpython Python 3.4.0 (none, unknown) [Gpython dev] - os/arch: linux/amd64 - go version: go1.16.6 >>> exit() Traceback (most recent call last): File "<stdin>", line 1, in <module> FIXME line of source goes here NameError: "name 'exit' is not defined" >>> import sys >>> sys.exit() <SystemExit instance at 0xc000208180> >>> quit() Traceback (most recent call last): File "<stdin>", line 1, in <module> FIXME line of source goes here NameError: "name 'quit' is not defined" ``` Unable to exit REPL of gpython by function.