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* 4211Kartik K. Agaram2018-02-201-0/+1
| | | | | | | | Just ran into first issue from using the portable /bin/sh rather than a modern shell: https://stackoverflow.com/questions/15744421/read-command-doesnt-wait-for-input Turn on errexit everywhere.
* 3789Kartik K. Agaram2017-03-121-0/+11
I accidentally got rid of git snapshotting of lessons back when I switched to testable file primitives last December (commit 3705). >:-( Bringing it back now, hopefully better. The improvement is that there's now at most one commit every time we hit F4. This change adds yet another reason that running `mu` from a different directory is just not supported.