Style of for loops enumeration example is unclear Ch. 4.6 of The Book.

[GoudaOnBeamPro]

The example is as follows:

for (i,j) in (5..10).enumerate() {
    println!("i = {} and j = {}", i, j);
}

The first tuple does not have a space between the comma and the j -> (i,j)
Is this correct?

[xitep]

apart from the reported issue; in this example, it would be nice to name j something like element or just v (for "value") to make clear that i is the enumerated index. i and j are often used for index variables. maybe even falling back to longer names like "index" and "value" would be better.

in the mentioned book chapter, the example on using lines.enumerate() that follows the reported one, is very clear and self-explanatory.

[Blaisorblade]

The original issue appears addressed in #34625, which was merged (though it's not yet reflected in the manual, https://doc.rust-lang.org/book/loops.html).

There's still the comment of @xitep to address, and I agree with him.

[steveklabnik]

(though it's not yet reflected in the manual, https://doc.rust-lang.org/book/loops.html).

Everything lands on nightly, then makes its way through the trains. So you can see it https://doc.rust-lang.org/nightly/book/loops.html , and it'll make it into 1.12's docs.