Loops until or while a condiation evaluates to true.
set i 0
until i == 7
task 'bob' "verify counter ($(i))"
set i (i + 1)
set i 0
while i < 7
task 'bob' "verify counter ($(i))"
set i (i + 1)
until and while understand break and continue, like cursor and
loop do.
until
false
push f.l 0
set outer-break break # alias local break to "outer-break"
until false
push f.l 'a'
outer-break 'x'