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  • Simon Peyton Jones's avatar
    Use transSuperClasses in TcErrors · 50249a9f
    Simon Peyton Jones authored and Marge Bot's avatar Marge Bot committed
    Code in TcErrors was recursively using immSuperClasses,
    which loops in the presence of UndecidableSuperClasses.
    
    Better to use transSuperClasses instead, which has a loop-breaker
    mechanism built in.
    
    Fixes issue #16414.
    50249a9f