if (return)
    ^~~~~~ unexpected void value expression
end
unless (return)
        ^~~~~~ unexpected void value expression
end
while (return)
       ^~~~~~ unexpected void value expression
end
until (return)
       ^~~~~~ unexpected void value expression
end
case (return)
      ^~~~~~ unexpected void value expression
when 1
end
class A < (return)
           ^~~~~~ unexpected void value expression
end
class << (return)
          ^~~~~~ unexpected void value expression
end
for x in (return)
          ^~~~~~ unexpected void value expression
end