struct11 test was fixed in d47a07c

tautschnig · jezhiggins · commit 8113c4932df1 · 2021-02-03T14:54:48.000Z
Mark it as CORE instead of KNOWNBUG.
diff --git a/regression/cbmc/struct11/test.desc b/regression/cbmc/struct11/test.desc
@@ -1,4 +1,4 @@
-KNOWNBUG
+CORE
 main.c
 
 ^EXIT=0$
