See how I use a comprehension to pass a lazily evaluated stream of fizzbuzzes to printAll()? Note that a more efficient implementation of printAll() could eaily avoid the string concatenation, thus taking much better advantage of the laziness.

fizzbuzz.ceylon

shared void run() => printAll { for (i in 0..50) fizzbuzz(i) };

String fizzbuzz(Integer i)
    =>   (i%15==0 then "fizzbuzz")
    else (i%3==0 then "fizz")
    else (i%5==0 then "buzz")
    else i.string;

void printAll({String*} strings) => print(", ".join(strings));