MySQL 5.1.24-rc ships with a EXAMPLE storage engine which is basically a dummy storage engine and serves as a useful source to start writing your own custom storage engine.
However, it is not available for use, by default. You can verify
this as follows:
mysql> show engines;
+------------+---------+-----------------------------------------------------------+--------------+----+------------+ | Engine | Support | Comment | Transactions | XA | Savepoints | +------------+---------+-----------------------------------------------------------+--------------+----+------------+ | …
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