process_literals :: [HsLit] -> [(EqnNo, EquationInfo)] -> ([ExhaustivePat],EqnSet)
process_literals used_lits qs
- | null default_eqns = ([make_row_vars used_lits (head qs)] ++ pats,indexs)
+ | null default_eqns = ASSERT( not (null qs) ) ([make_row_vars used_lits (head qs)] ++ pats,indexs)
| otherwise = (pats_default,indexs_default)
where
(pats,indexs) = process_explicit_literals used_lits qs
(pats',indexs') = check' default_eqns
pats_default = [(make_whole_con c:ps,constraints) |
c <- unused_cons, (ps,constraints) <- pats'] ++ pats
- new_wilds = make_row_vars_for_constructor (head qs)
+ new_wilds = ASSERT( not (null qs) ) make_row_vars_for_constructor (head qs)
pats_default_no_eqns = [(make_whole_con c:new_wilds,[]) | c <- unused_cons] ++ pats
indexs_default = unionUniqSets indexs' indexs
get_lit (LitPat lit) = Just lit
get_lit (NPat (HsIntegral i _) mb _ _) = Just (HsIntPrim (mb_neg mb i))
get_lit (NPat (HsFractional f _) mb _ _) = Just (HsFloatPrim (mb_neg mb f))
+get_lit (NPat (HsIsString s _) _ _ _) = Just (HsStringPrim s)
get_lit other_pat = Nothing
mb_neg :: Num a => Maybe b -> a -> a
mb_neg (Just _) v = -v
get_unused_cons :: [Pat Id] -> [DataCon]
-get_unused_cons used_cons = unused_cons
+get_unused_cons used_cons = ASSERT( not (null used_cons) ) unused_cons
where
(ConPatOut { pat_con = l_con, pat_ty = ty }) = head used_cons
ty_con = dataConTyCon (unLoc l_con) -- Newtype observable