[Newbies] Specifying method names in Squeak 6.0

I'm following the instructions in Squeak By Example (SBE), edition 5.3. On page 32 it gives code for SBECell initialize. When I type the exact code (excerpted below) It turns everything after the »red. When I accept it, I get "Nothing more expected". If I delete the "» initialize", it gets syntax colored and looks valid, but the method name is no longer initialize. Is this a change from Squeak 5.3 to 6.0. Should I download Squeak 5.3 in order to use the SBE book?

SBECell»initialize super initialize. self label: ''; borderWidth: 2; bounds: (0 @ 0 corner: 16 @ 16); offColor: Color cantaloupe; onColor: Color aqua; useSquareCorners. self turnOff.