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by James Robertson.
Original Post: Extending PreReqs
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Randy Coulman has added an extension to the new pre-req system in VW 7.7 - it's a feature of the preceding "New Prereq Engine" work that didn't get carried forward:
In our work, we find that it is important to distinguish between prerequisites that we know are required, even if the tool can't find a reason, and prerequisites that used to be required, but no longer are. We have a set of tests that we run on our code. One of these tests checks to make sure that the prerequisites on all of our packages are up-to-date. That is, that what is specified matches what the tool computes. Without the concept of an explicit prerequisite, we can't keep this test passing.
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