test/mjsunit/bugs/bug-618.js

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// When this bug is corrected move to object-define-property and add
// additional tests for configurable in the same manner as existing tests
// there.

function C() {
  this.x = 23;
}

// If a setter is added to the prototype chain of a simple constructor setting 
// one of the properties assigned in the constructor then this setter is 
// ignored when constructing new objects from the constructor.

// This only happens if the setter is added _after_ an instance has been 
// created.

assertEquals(23, new C().x);
C.prototype.__defineSetter__('x', function(value) { this.y = 23; });
assertEquals(void 0, new C().x));