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Luke Plant ff3d746e8d Fixed bug in circular dependency algo for migration dependencies.
Previous algo only worked if the first item was a part of the loop,
and you would get an infinite loop otherwise (see test).

To fix this, it was much easier to do a pre-pass.

A bonus is that you now get an error message that actually helps you debug
the dependency problem.
2014-11-25 15:37:34 +00:00
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