MalformedType used for all invalid type annotations.

tests/language/language.status

Index: tests/language/language.status
diff --git a/tests/language/language.status b/tests/language/language.status
index 3eb99ecb137b8cdd98000431409fa87edb900655..42e69902ff89e87f1c441331ebf648d5ebebd0d2 100644
--- a/tests/language/language.status
+++ b/tests/language/language.status
@@ -58,6 +58,9 @@ no_such_method_test: Fail # issue 3326, 3622.
 export_cyclic_test: Fail, Crash # issue 6060
 duplicate_export_negative_test: Fail # issue 6134
 invocation_mirror_indirect_test: Fail # Issue 3326
+type_annotation_test/04: Fail # Issue 6970
+type_annotation_test/06: Fail # Issue 6973
+type_annotation_test/09: Fail # Issue 6973
 
 [ $compiler == none && ($system == macos || $system == linux) && $arch == ia32 && $checked ]
 gc_test: Skip  # Issue 1487, flaky.
@@ -144,6 +147,9 @@ field_method4_negative_test: Fail  # Runtime only test, rewrite as multitest
 getter_no_setter_test/01: Fail # Fails to detect compile-time error.
 getter_no_setter2_test/01: Fail # Fails to detect compile-time error.
 instance_call_wrong_argument_count_negative_test: Fail # Runtime only test, rewrite as multitest
+type_annotation_test/02: Fail # Issue 6974
+type_annotation_test/07: Fail # Issue 6974
+type_annotation_test/08: Fail # Issue 5291
 # Test expects signature of noSuchMethod to be correct according
 # to specification. Should start working when the library signature
 # changes.
@@ -327,6 +333,13 @@ type_variable_scope_test: Fail # type arguments on redirecting factory not imple
 many_overridden_no_such_method_test: Fail, Pass, OK # Fails in minified mode, test depends on method names.
 overridden_no_such_method_test: Fail, Pass, OK # Fails in minified mode, test depends on method names.
 
+# Malformed types not handled as unresolved:
+import_core_prefix_test: Fail
+prefix16_test: Fail
+prefix22_test: Fail
+type_annotation_test/04: Fail
+type_annotation_test/06: Fail
+
 # Calling unresolved class constructor:
 call_nonexistent_constructor_test: Fail