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commit 91c210c54e685aca085b404f3ab237f9d7ad10c0
Merge: 9dd68b6 e38a5fe
Author: cpirich <chris@code.org>
Date:   Mon Nov 3 15:45:12 2014 -0800

    Merge pull request #320 from code-dot-org/editcode_step_error

    handle exceptions inside interpreter.step

commit e38a5fe38caebd2d38a939227e92d6efd89778ce
Author: cpirich <chris@code.org>
Date:   Mon Nov 3 15:34:01 2014 -0800

    handle exceptions inside interpreter.step