altos/scheme: Allow ao_scheme_read_eval_print to be restarted
authorKeith Packard <keithp@keithp.com>
Mon, 11 Dec 2017 02:35:53 +0000 (18:35 -0800)
committerKeith Packard <keithp@keithp.com>
Mon, 11 Dec 2017 20:20:25 +0000 (12:20 -0800)
Reset exceptions at the top so that we can call it more than once.

Signed-off-by: Keith Packard <keithp@keithp.com>

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