Make mappedBy lazy.

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 53558497c05260528ead5f16eb7f007049a66fd2..192f55cd6075871afa3de460f6b79ed59353a208 100644
--- a/tests/co19/co19-runtime.status
+++ b/tests/co19/co19-runtime.status
@@ -28,6 +28,14 @@ Language/13_Libraries_and_Scripts/1_Imports_A02_t22: Crash # TODO(vm-team): Plea
 
 Language/11_Expressions/30_Identifier_Reference_A05_t04: Fail, OK # co19 issue 302
 
+LibTest/core/Queue/some_A01_t06: Fail, OK # behavior of some is undefined when underlying collection changes, issue 6719
+LibTest/core/Queue/every_A01_t06: Fail, OK # behavior of some is undefined when underlying collection changes, issue 6719
+LibTest/core/Queue/forEach_A01_t04: Fail, OK # behavior of some is undefined when underlying collection changes, issue 6719
+
+LibTest/core/Strings/concatAll_A03_t01: Fail, OK # checks for NullPointerException. Should check for ArgumentError, issue 6719
+LibTest/core/Strings/join_A03_t01: Fail, OK # checks for NullPointerException. Should check for ArgumentError, issue 6719
+LibTest/core/Strings/join_A02_t01: Fail, OK # checks for NullPointerException. Should check for ArgumentError, issue 6719
+
 LibTest/core/Queue/filter_A01_t04: Fail, OK # filter->where, issue 6719
 LibTest/core/Queue/filter_A01_t06: Fail, OK # filter->where, issue 6719
 LibTest/core/Queue/filter_A01_t02: Fail, OK # filter->where, issue 6719