[Newbies] Infinite loops

[obrienj]

I’m using a MacBook Pro and can’t find a way to escape an infinite loop such as this:

x := 0. [x >= 0] whileTrue: [x := x +1. Transcript show: 'infinite loop ', x; cr]

The the interrupt key (Alt- or Cmd-) does not work, instead I have to force quite Squeak.  Is there a reliable to way to escape an endless loop?
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