New implementation of {,Linked}Hash{Set,Map}.

tests/co19/co19-runtime.status

Index: tests/co19/co19-runtime.status
diff --git a/tests/co19/co19-runtime.status b/tests/co19/co19-runtime.status
index af31ae0522b17a4f4146c95eee02ea3805ec96f8..b54902bc2ad8b7247c184d172a76cc444880e5f2 100644
--- a/tests/co19/co19-runtime.status
+++ b/tests/co19/co19-runtime.status
@@ -502,6 +502,24 @@ LibTest/core/Queue/removeLast_A01_t01: Fail # Moved collection classes from core
 LibTest/core/Queue/removeLast_A02_t01: Fail # Moved collection classes from core to collection. co19 issue 371.
 LibTest/core/Set/Set.from_A01_t01: Fail # Moved collection classes from core to collection. co19 issue 371.
 
+# Doesn't expect null to be allowed in Set or Map keys (issue 377).
+LibTest/core/Map/containsKey_A01_t02: Fail
+LibTest/core/Map/operator_subscript_A01_t02: Fail
+LibTest/core/Map/operator_subscripted_assignment_A01_t02: Fail
+LibTest/core/Map/remove_A01_t02: Fail
+LibTest/core/Set/add_A01_t02: Fail
+LibTest/core/Set/addAll_A01_t02: Fail
+LibTest/core/Set/contains_A01_t02: Fail
+LibTest/core/Set/containsAll_A01_t02: Fail
+LibTest/core/Set/intersection_A03_t01: Fail
+LibTest/core/Set/isSubsetOf_A01_t02: Fail
+LibTest/core/Set/remove_A01_t02: Fail
+LibTest/core/Set/removeAll_A01_t02: Fail
+
+# Doesn't expect concurrent modification error (issue 376).
+LibTest/core/Map/forEach_A01_t07: Fail
+LibTest/core/Map/putIfAbsent_A01_t02: Fail
+
 [ $compiler == none && $runtime == vm && $unchecked ]
 LibTest/core/Future/chain_A02_t05: Fail # Future is in async library. co19 issue 367
 LibTest/core/Future/transform_A02_t04: Fail # Future is in async library. co19 issue 367