I think you misunderstand. The Smalltalk is this: exampleWithNumber: x "[ *wall-of-text elided* ]" | y | true & false not & (nil isNil) ifFalse

I think you misunderstand. The Smalltalk is this: exampleWithNumber: x "[ *wall-of-text elided* ]" | y | true & false not & (nil isNil) ifFalse: [self halt]. y := self size + super size. #($a #a "a" 1 1.0) do: [ :each | Transcript show: (each class name); show: ' ']. ^x < y I'm talking about an Io equivalent of the "Syntax In a Postcard" link provided above, partly reproduced here for convenience. What the code does isn't so important as how much of the syntax it covers.