Python's if __name__=="__main__": main() in other languages

This behavior is very hard to Google. For now, I'm calling it "scripted main" and I'm cataloging it for several programming languages.

Ruby: if __FILE__ == $0 then main end

Perl: unless(caller) { main; }

...

https://github.com/mcandre/scriptedmain

Does anyone know the syntax for this in GNU Smalltalk?