v8/test/mjsunit/compiler/recursive-deopt.js

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// Flags: --allow-natives-syntax

function f(n) {
  // Force deopt in both leaf case and when returning. To make
  // debugging easier, the operation that bails out (<<) is so simple
  // that it doesn't cause GCs.
  if (n == 0) return 1 << one;
  return f(n - 1) << one;
}

%PrepareFunctionForOptimization(f);

var one = 1;
for (var i = 0; i < 5; i++) assertEquals(1 << 5, f(4));
%OptimizeFunctionOnNextCall(f);
assertEquals(1 << 5, f(4));

var one = { valueOf: function() { return 1; } };
assertEquals(1 << 5, f(4));