Migrate rx/pure tests to strict mode, fix broken tests

[hiphop-php.git] / hphp / hack / test / typecheck / reactive / mutability_flavors3.php

<?hh

class A {}

<<__Rx>>
function f(): void {
  $a = \HH\Rx\mutable(new A());
  // ERROR
  $a = \HH\Rx\freeze($a);
}