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 f7c3283036d44d2e6de6d1a43c38ab35cbaf1c9f..8debcc25074fc8ba677111cc84d7fae9ebb18098 100644
--- a/tests/language/language.status
+++ b/tests/language/language.status
@@ -57,6 +57,9 @@ 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
 
 # Test issue 6324
 generic_instanceof3_test: Fail, OK
@@ -291,6 +294,9 @@ 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.
@@ -552,6 +558,13 @@ const_factory_redirection_test: Fail # http://dartbug.com/6894
 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