Statements as expression

[giann]

When a block expression has a single statement, the block syntax should be omittable:

final result = from {
    foreach (el in list) {
        if (el.isOk()) {
            out el;
        }
    }
};

becomes

final result = foreach (el in list) {
    if (el.isOk()) {
        out el;
    }
};