Environment-setVariable-15.js

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// Debugger.Environment should throw trying to setVariable on a const binding.

load(libdir + "asserts.js");

var g = newGlobal({newCompartment: true});

var dbg = new Debugger;

dbg.addDebuggee(g);

dbg.onEnterFrame = (frame) => {

  frame.onStep = () => {

    if (frame.environment.getVariable("x") === 42) {

      assertThrowsInstanceOf(() => frame.environment.setVariable("x", 43), TypeError);

      assertEq(frame.environment.getVariable("x"), 42);

};

};

const unaliased = g.parseModule(`

  const x = 42;

  assertEq(x, 42);

`);

moduleLink(unaliased);

moduleEvaluate(unaliased);

const aliased = g.parseModule(`

  const x = 42;

  assertEq(x, 42);

  function closedOver() {

    return x;

`);

moduleLink(aliased);

moduleEvaluate(aliased);