+
+ where
+ -- Sometimes, the TyCon in the type of the scrutinee is an HiBootTyCon,
+ -- which may not have any constructors inside it. If so, then we
+ -- can get a better TyCon by grabbing the one from a constructor alternative
+ -- if one exists.
+ look_for_better_tycon
+ | ((DataAlt con, _, _) : _) <- data_alts =
+ AlgAlt (dataConTyCon con)
+ | otherwise =
+ ASSERT(null data_alts)
+ PolyAlt
+ where
+ (data_alts, _deflt) = findDefault alts