Fix for bug 1229: Unary operator plus is not allowed ... except for literals.

runtime/vm/bigint_operations.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 "vm/bigint_operations.h"
 
 #include <openssl/crypto.h>
 
 #include "platform/utils.h"
 #include "vm/bigint_store.h"
@@ skipping 227 matching lines @@
 }
 
 
 const char* BigintOperations::ToHexCString(const Bigint& bigint,
                                            uword (*allocator)(intptr_t size)) {
   return ToHexCString(bigint.BNAddr(), allocator);
 }
 
 
 bool BigintOperations::FitsIntoSmi(const Bigint& bigint) {
+  ASSERT(!bigint.IsNull());
   const BIGNUM *bn = bigint.BNAddr();
   int bits = BN_num_bits(bn);
   // Special case for kMinValue as the absolute value is 1 bit longer
   // than anything else
   if (bits == Smi::kBits + 1 && BN_abs_is_word(bn, -Smi::kMinValue)
       && bigint.IsNegative()) {
     return true;
   }
   // All other cases must have no more bits than the size of an Smi
   if (bits > Smi::kBits) {
@@ skipping 369 matching lines @@
   result.ToggleSign();
   return result.raw();
 }
 
 
 int BigintOperations::Compare(const Bigint& a, const Bigint& b) {
   return BN_cmp(a.BNAddr(), b.BNAddr());
 }
 
 }  // namespace dart