test/mjsunit/regress/regress-1213.js

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// Test that we do not allow overwriting a global property with a
// redeclaration that makes the property configurable (and hence
// deletable).

var x = 0;

function TestGlobal() {
  for (var i = 0; i < 2; i++) {
    x = x + 1;
  }
  this.eval('function x() {};');
  delete this['x'];
}

TestGlobal();
TestGlobal();