1 => ^(return)
       ^~~~~~ unexpected void value expression
while true
  1 => ^(break)
         ^~~~~ unexpected void value expression
  1 => ^(next)
         ^~~~ unexpected void value expression
  1 => ^(redo)
         ^~~~ unexpected void value expression
  1 => ^(retry)
         ^~~~~ Invalid retry without rescue
         ^~~~~ unexpected void value expression
  1 => ^(2 => a)
         ^~~~~~ unexpected void value expression
end
1 => ^(if 1; (return) else (return) end)
              ^~~~~~ unexpected void value expression
1 => ^(unless 1; (return) else (return) end)
                  ^~~~~~ unexpected void value expression