Fix stuck resolution #61
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The whole backtrack() function is picked apart and put together again. I think this finally makes 100% sense to me, my previous implementation was such a flux. Every round of resolution is now a process of 1. Inheriting criteria from the prvious state 2. Create a new pin When backtracking, the state to backtrack into not only inherits criteria from the "parent" state, but also receives additional incompatibility information from the "child" state that discovered them. So when we backtrack into it, the state's criteria should be modified in-place so subsequence backtracking into it would also know about those incompatibilities. Also (this is the part I got wrong), since the state being backtracked into does not produce a valid pin after the backtracking process (its previous pin is now considered an incompatibility), we SHOULD NOT push a new state; the next round should work on producing a pin on that state.
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Closing in favour of #62, which is basically the same thing, but with cleaner implementation (IMO) and better commits. |
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Eventually fix pypa/pip#9011. Currently only a test case that does not pass.