test/mjsunit/this-property-assignment.js

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// Tests the handling of multiple assignments to the same property in a
// constructor that only has simple this property assignments.

function Node() {
  this.a = 1;
  this.a = 2;
  this.a = 3;
}

var n1 = new Node();
assertEquals(3, n1.a);

var n2 = new Node();
assertEquals(3, n2.a);