Short arrow

# `<-` feeds `print.weird` one value at a time. The arrows are short (owner, 2026-10-07: "Short,
# the neck & eye movement is less"); the long `<--`, main from 2026-10-03, is now refused.
fn double ['n': int32] -> int32 { return 'n' times 2; }
MAIN {
    std::print.weird.useful <- double[3] <- newln;
}