Backport "A slightly more conservative version of #14218" #18370
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Two changes
- Fix `hasUpperBound` to work correctly for higher-kinded types
- A more conservative fix in `IsFullyDefinedAccumulator`. We now maintain
the symmetry that
- if variance < 0, we maximize
- if variance > 0 (and Nothing is admissible) we minimize
- only if variance = 0, we use the upper bound as a tie breaker
Previously, we maximized even if variance > 0 if there was an upper but
no lower bound. But that was asymmetric since there is no corresponding
case where we minimize at variance < 0 if there is a lower but no upper
bound.
|
Closing, as the PR head needs to be on the same repo as a base, for the "merge queue at home" approach to work properly. #18371 is now the correct PR. |
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Backports #18352