Order of evaluation (does Swift have sequence points?)

(Also posted on stack overflow: http://stackoverflow.com/questions/32705320/undefined-behavior-or-does-swift-have-sequence-points)

In C/C++, the following code exhibits both undefined and unspecified behaviour:

int i = 0;
int j = i++ + i++ + ++i;

The order of evaluation of operands is unspecified, and side effects on the same object

i

Swift was designed as a safe language, so what is the corresponding situation here? Is the result of

var i = 0 
let j = i++ + i++ + ++i

well-defined? Can one conclude from the language reference in the Swift book that

j == 4