v8/test/mjsunit/es6/regress/regress-cr372788.js

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// Flags: --allow-natives-syntax

var x = 0;
var y = 0;

var thenable = { then: function(f) { x++; f(); } };

for (var i = 0; i < 3; ++i) {
  Promise.resolve(thenable).then(function() { x++; y++; });
}
assertEquals(0, x);

(function check() {
  Promise.resolve().chain(function() {
    // Delay check until all handlers have run.
    if (y < 3) check(); else assertEquals(6, x);
  }).catch(function(e) { %AbortJS("FAILURE: " + e) });
})();