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A comment on Nix as OS X Package Manager. Parent comment

Re:Nix as OS X Package Manager by yaowenjiaozi on Wednesday May 25, 2016 @11:22PM (#11775137)
In Smalltalk implementations like Pharo, Squeak etc changes are captured in a changes file. If the image crashes before being saved, it is possible to cherry pick and replay unsaved changes from the changes file.
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Re:Nix as OS X Package Manager by geocar on Thursday May 26, 2016 @03:37AM (#11776277)
You can do this with Docker as well: Mount two commits and diff between them, pull bits into a third.

It's also a surprisingly convenient way to build tests.

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