How to create memory table with hashed index?

Can you help me to explain, how to create Memory table with hashed index in MySQL?

MySQL provides USING clause which can be specified at table creation time to ask for hashed index on a particular column. The following example declares a hashed index on the username column:

CREATE TABLE users (
	id SMALLINT UNSIGNED NOT NULL AUTO_INCREMENT,
	username CHAR(15) NOT NULL,
	pwd CHAR(15) NOT NULL,
	INDEX USING HASH (username),
	PRIMARY KEY(id)
) Engine=MEMORY;