From: Steve Klabnik <steve@...>
Date: 2012-02-10T02:45:19+09:00
Subject: Re: Difference between return and "not return"

Because 'return' takes an argument, and ruby infers the []s.

In the second case, 1, 2 by itself is not a valid statement, it
doesn't guess the []s.

Just do

def y
 [1, 2]
end