unreachable
Used to declare a location in your code should not be reachable. If the instruction is called then it will throw an exception.

Syntax

unreachable

Example

;; Create loop section
loop $name_of_loop_section
  ;; Do something

  ;; We want to do it again
  br $name_of_loop_section

  ;; We should never get here, but if we do then throw an error
  unreachable
end