Get tools/test.py --noopt green.

runtime/bin/secure_socket.cc

 // Copyright (c) 2012, 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 "bin/secure_socket.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <sys/stat.h>
 #include <stdio.h>
@@ skipping 63 matching lines @@
 static void ThrowIOException(int status,
                              const char* exception_type,
                              const char* message,
                              bool free_message = false) {
   char error_string[SSL_ERROR_MESSAGE_BUFFER_SIZE];
   FetchErrorString(error_string, SSL_ERROR_MESSAGE_BUFFER_SIZE);
   OSError os_error_struct(status, error_string, OSError::kBoringSSL);
   Dart_Handle os_error = DartUtils::NewDartOSError(&os_error_struct);
   Dart_Handle exception =
       DartUtils::NewDartIOException(exception_type, message, os_error);
+  ASSERT(!Dart_IsError(exception));
   if (free_message) {
     free(const_cast<char*>(message));
   }
   Dart_ThrowException(exception);
   UNREACHABLE();
 }
 
 
 static SSLFilter* GetFilter(Dart_NativeArguments args) {
   SSLFilter* filter;
@@ skipping 1026 matching lines @@
     } else {
       if (SSL_LOG_DATA) Log::Print(
           "WriteEncrypted  BIO_read wrote %d bytes\n", bytes_processed);
     }
   }
   return bytes_processed;
 }
 
 }  // namespace bin
 }  // namespace dart