Yuki Okushi dcb4083ed9
Rollup merge of #80805 - camelid:iter-by_ref-example, r=steveklabnik
Improve `Iterator::by_ref` example

I split the example into two: one that fails to compile, and one that
works. I also made them identical except for the addition of `by_ref`
so we don't confuse readers with random differences.

cc `@steveklabnik,` who is the one that added the previous version of this example
2021-04-24 03:44:02 +09:00
..
2021-03-18 00:25:20 +01:00