test/mjsunit/compiler/regress-5.js

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// Test breaking out of labelled blocks.
function f(y) {
  var x = 0;

  foo: {
    x++;
    bar: {
       if (y == 0) break bar; else break foo;
    }
    x++;
  }
  return x;
}

assertEquals(2, f(0));
assertEquals(1, f(1));