STREAM iRule commands on 9.1.2

I read SOL8115 while trying to create an iRule which uses STREAM commands on an LTM running 9.1.2. But even after pasting the exact rule from that SOL into the iRule editor, I get the following errors:

 

 

line 2: [undefined procedure: STREAM::enable] [STREAM::enable]

 

line 3: [undefined procedure: STREAM::expression] [STREAM::expression "@abc@123@"]

 

 

Here's the iRule:

 

when HTTP_RESPONSE {

 

STREAM::enable

 

STREAM::expression "@abc@123@"

 

}

 

 

What's the deal? The SOL doesn't say anything about STREAM commands in iRules not being supported 9.1.2. In fact, it states "For BIG-IP LTM version 9.3.1, 9.4.2 and later, the stream filter must be enabled after the stream expression is specified". This implies to me that the commands are supported on earlier versions. Is my interpretation wrong?