Temporary workaround for issue 5474672.

runtime/vm/object.cc

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/object.h"
 
 #include "vm/assembler.h"
 #include "vm/assert.h"
 #include "vm/bigint_operations.h"
 #include "vm/bootstrap.h"
@@ skipping 1752 matching lines @@
   return HasResolvedTypeClass() &&
       (type_class() == Type::Handle(Type::FunctionInterface()).type_class());
 }
 
 
 bool Type::IsMoreSpecificThan(const Type& other) const {
   ASSERT(IsFinalized());
   ASSERT(other.IsFinalized());
   // Type parameters cannot be handled by Class::IsMoreSpecificThan().
   if (IsTypeParameter() || other.IsTypeParameter()) {
-    return IsTypeParameter() && other.IsTypeParameter() &&
-        (Index() == other.Index());
+    // TODO(regis): Revisit this temporary workaround. See issue 5474672.
+    return
+        (!IsTypeParameter() && other.IsTypeParameter()) ||
+        (IsTypeParameter() && other.IsTypeParameter() &&
+         (Index() == other.Index()));
   }
   const Class& cls = Class::Handle(type_class());
   return cls.IsMoreSpecificThan(TypeArguments::Handle(arguments()),
                                 Class::Handle(other.type_class()),
                                 TypeArguments::Handle(other.arguments()));
 }
 
 
 bool Type::Test(TypeTestKind test, const Type& other) const {
   ASSERT(IsFinalized());
   ASSERT(other.IsFinalized());
   // Type parameters cannot be handled by Class::TestType().
   if (IsTypeParameter() || other.IsTypeParameter()) {
-    return IsTypeParameter() && other.IsTypeParameter() &&
-        (Index() == other.Index());
+    // TODO(regis): Revisit this temporary workaround. See issue 5474672.
+    return
+        (!IsTypeParameter() && other.IsTypeParameter()) ||
+        (IsTypeParameter() && other.IsTypeParameter() &&
+         (Index() == other.Index()));
   }
   const Class& cls = Class::Handle(type_class());
   if (test == kIsSubtypeOf) {
     return cls.IsSubtypeOf(TypeArguments::Handle(arguments()),
                             Class::Handle(other.type_class()),
                             TypeArguments::Handle(other.arguments()));
   } else {
     ASSERT(test == kIsAssignableTo);
     return cls.IsAssignableTo(TypeArguments::Handle(arguments()),
                               Class::Handle(other.type_class()),
@@ skipping 4658 matching lines @@
   const String& str = String::Handle(pattern());
   const char* format = "JSRegExp: pattern=%s flags=%s";
   intptr_t len = OS::SNPrint(NULL, 0, format, str.ToCString(), Flags());
   char* chars = reinterpret_cast<char*>(
       Isolate::Current()->current_zone()->Allocate(len + 1));
   OS::SNPrint(chars, (len + 1), format, str.ToCString(), Flags());
   return chars;
 }
 
 }  // namespace dart