while a in b, do 1 end

until a in b, do 1 end

for x in a in b, do 1 end

loop do a in b, end

"#{a in b,}"

while a in x: do 1 end

while a in x: 1, do 1 end

while a in x:, y: do 1 end

loop do a in x: end

"#{a in x:}"

a in x: and 1
