Using range expression in `foreach` statement should not create a list

[giann]

Ranges are syntaxic sugar to create list of integers. But when used in a foreach statement it should be expanded to a classic for statement:

foreach (int i in 0...n) {
    | ...
}

should be syntaxic sugar for:

for (int i = 0; i < n; i = i + 1) {
    | ...
}