Report correct error message in case of super invocation (fix issue 8208).

runtime/vm/class_finalizer.cc

 // Copyright (c) 2013, 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/class_finalizer.h"
 
 #include "vm/flags.h"
 #include "vm/heap.h"
 #include "vm/isolate.h"
 #include "vm/longjump.h"
@@ skipping 378 matching lines @@
       ASSERT(factory.RedirectionTarget() == Function::null());
       return;
     }
   }
 
   // Verify that the target is const if the redirecting factory is const.
   if (factory.is_const() && !target.is_const()) {
     const Script& script = Script::Handle(target_class.script());
     ReportError(Error::Handle(),  // No previous error.
                 script, target.token_pos(),
-                "constructor '%s' must be const as required by redirecting"
+                "constructor '%s' must be const as required by redirecting "
                 "const factory '%s'",
                 String::Handle(target.name()).ToCString(),
                 String::Handle(factory.name()).ToCString());
   }
 
   // Update redirection data with resolved target.
   factory.SetRedirectionTarget(target);
   // Not needed anymore.
   factory.SetRedirectionIdentifier(Object::null_string());
   if (!target.IsRedirectingFactory()) {
@@ skipping 2241 matching lines @@
   expected_name ^= String::New("_offset");
   ASSERT(String::EqualsIgnoringPrivateKey(name, expected_name));
   field ^= fields_array.At(2);
   ASSERT(field.Offset() == TypedDataView::length_offset());
   name ^= field.name();
   ASSERT(name.Equals("length"));
 #endif
 }
 
 }  // namespace dart