remove unused code in haskell implementation

haskell/src/SumTypes/EliminateContextArgument.hs

@@ -221,7 +221,6 @@ checkType p@(Case e n1 t1 n2 t2 _) = do
 checkType p@(Tag n t _) = do
   ty <- requiredType p
   types <- matchVariant ty (show p)
-  let lty = Map.lookup n types
   lty <- liftMaybe (Map.lookup n types) "Label not contained in Variant"
   checkType t
 checkType p@(Match m cases _) = do

haskell/test/SumTypes/TestCases.hs

@@ -45,7 +45,7 @@ tFailCaseRightShadowBinding = root $ (let' "a" zero (anno Nat (case' (anno (Sum
 tFailWrongTypeForTaggedLabel = root $ (anno (Variant (fromList [("c", Nat), ("a", Nat), ("b", (Fun Nat Nat))])) (tag "b" zero))
 tFailWrongLabel = root $ (anno (Variant (fromList [("c", Nat), ("a", Nat), ("b", (Fun Nat Nat))])) (tag "d" zero))
 
-tFailMatchNotVariant = root $ (anno Nat (match1 (anno (Variant (fromList [("a", Nat)])) zero) ("a", "x", succ $ var "x")))
+tFailMatchNotVariant = root $ (anno Nat (match1 (anno Nat zero) ("a", "x", succ $ var "x")))
 
 tFailMatchUnequalTypesForCases = root $ (anno Nat (match2 (anno (Variant (fromList [("a", Nat), ("b", (Fun Nat Nat))])) (tag "b" (lam "x" (var "x")))) ("a", "x", succ $ var "x") ("b", "x", (var "x") )))
 -- tOkMatchSingle = root $ (anno Nat (match1 (anno (Variant (fromList [("a", Nat)])) (tag "a" zero)) ("a", "x", succ $ var "x")))