[rust-dev] Adding "else" on "for" loops, like Python

[Simon Sapin]

Hi,

Now that the for loop is based on external iterators, can we reconsider 
"for-else"?

Proposal:

    for i in iter {
        // ...
    } else {
        // ...
    }

The optional else block is executed when the for loop stops without 
exhausting the iterator, ie. when "break" is used.

--
Simon Sapin
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