[swift-evolution] Proposal: Remove the underscore and `in` for `for` loop

[Diego Barros]

When you want a simple `for` loop, for example:

for _ in 1...10 {

// do something 10 times

}


Clean-up and simplify the syntax by removing the superfluous underscore and
`in`:


for 1...10 {

// do something 10 times

}

-- diego
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