import TyCon ( isAlgTyCon )
import Id
import Var ( Var, globalIdDetails, idType )
-import TyCon ( isUnboxedTupleTyCon, isPrimTyCon, isFunTyCon )
+import TyCon ( isUnboxedTupleTyCon, isPrimTyCon, isFunTyCon, isHiBootTyCon )
#ifdef ILX
import MkId ( unsafeCoerceId )
#endif
= case splitTyConApp_maybe (repType scrut_ty) of
Just (tc,_) | isUnboxedTupleTyCon tc -> UbxTupAlt tc
| isPrimTyCon tc -> PrimAlt tc
- | isAlgTyCon tc -> AlgAlt tc
+ | isHiBootTyCon tc -> PolyAlt -- Algebraic, but no constructors visible
+ | isAlgTyCon tc -> AlgAlt tc
| isFunTyCon tc -> PolyAlt
| otherwise -> pprPanic "mkStgAlts" (ppr tc)
Nothing -> PolyAlt