File: false_existential.sail

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sail-ocaml 0.19.1%2Bdfsg5-1
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default Order dec
$include <prelude.sail>

/* Careless simplification of the existential type can leave an unused
   'b binding that the type checker rejects. */

val some_bool : unit -> bool

function main() -> unit = {
  let x : {('b : Bool), true. bool('b & false)} = some_bool() & false;
  if x then print_endline("bad") else print_endline("good")
}