How to SWAP in Mojo

[Sai-Vignesh]

Unlike Python, we can't swap the values of variables in a single statement.
like a,b = b,a

[lattner]

Thanks for the nudge, I implemented support for tuples on the left side. They still require parens, but this allows (a, b) = (b, a) to work in the next update. In the meantime you can use a temporary like:

tmp = a
a = b
b = tmp