Restore region uniquification in the new solver 🎉 #114117
Merged
bors merged 2 commits intorust-lang:masterfrom Jul 27, 2023
Merged
Restore region uniquification in the new solver 🎉 #114117bors merged 2 commits intorust-lang:masterfrom
bors merged 2 commits intorust-lang:masterfrom
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All of the bugs that were "due" to uniquification have been settled via other means (e.g. bidirectional alias-relate, param-env incompleteness, etc).
Firstly, revert the functional changes in #110180. 😸
Secondly, we need to ignore regions when considering if a goal has changed (the "has_changed" boolean returned from
evaluate_goal) -- otherwise, because we're doing region uniquification, we may perpetually consider a goal to be changed. See the UI test I committed for an explanation.cc rust-lang/trait-system-refactor-initiative#30