fix embedded vector copy constructor and assignment.

test/cctest/test-utils.cc

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 159 matching lines @@
     CHECK_EQ(0, strncmp(buffer.start(), s, i - 1));
     CHECK_EQ(kMarker, buffer[i]);
     if (i <= length) {
       CHECK_EQ(i - 1, strlen(buffer.start()));
     } else {
       CHECK_EQ(length, strlen(buffer.start()));
     }
     buffer.Dispose();
   }
 }
+
+
+// Issue 358: When copying EmbeddedVector, Vector::start_ must point
+// to the buffer in the copy, not in the source.
+TEST(EmbeddedVectorCopy) {
+  EmbeddedVector<int, 1> src;
+  src[0] = 100;
+  EmbeddedVector<int, 1> dst = src;
+  CHECK_NE(src.start(), dst.start());
+  CHECK_EQ(src[0], dst[0]);
+  src[0] = 200;
+  CHECK_NE(src[0], dst[0]);
+}
+
+
+// Also Issue 358, assignment case.
+TEST(EmbeddedVectorAssign) {
+  EmbeddedVector<int, 1> src;
+  src[0] = 100;
+  EmbeddedVector<int, 1> dst;
+  dst[0] = 200;
+  CHECK_NE(src.start(), dst.start());
+  CHECK_NE(src[0], dst[0]);
+  dst = src;
+  CHECK_NE(src.start(), dst.start());
+  CHECK_EQ(src[0], dst[0]);
+  src[0] = 200;
+  CHECK_NE(src[0], dst[0]);
+}