Generalize "Don't approximate a type using Nothing as prefix" #23628
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This generalizes scala#23531 which skipped higher-kinded types, turns out approximating them to Nothing can lead to the same issue. Fixes scala#23627.
WojciechMazur
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This generalizes #23531 which skipped higher-kinded types, turns out approximating them to Nothing can lead to the same issue.
Fixes #23627.