v8/test/debugger/debug/debug-liveedit-2.js

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// Flags: --noalways-opt --allow-natives-syntax

Debug = debug.Debug

eval("function ChooseAnimal(p) {\n " +
     "  if (p == 7) {\n" + // Use p
     "    return;\n" +
     "  }\n" +
     "  return function Chooser() {\n" +
     "    return 'Cat';\n" +
     "  };\n" +
     "}\n");

var old_closure = ChooseAnimal(19);

assertEquals("Cat", old_closure());

// We patch innermost function "Chooser".
// However, this does not actually patch existing "Chooser" instances,
// because old value of parameter "p" was not saved.
// Instead it patches ChooseAnimal.
%LiveEditPatchScript(
    ChooseAnimal, Debug.scriptSource(ChooseAnimal).replace("'Cat'", "'Capybara' + p"));

var new_closure = ChooseAnimal(19);
// New instance of closure is patched.
assertEquals("Capybara19", new_closure());

// Old instance of closure is not patched.
assertEquals("Cat", old_closure());