nested-delete-name-in-evalcode.js

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// Any copyright is dedicated to the Public Domain.

// http://creativecommons.org/licenses/publicdomain/

//-----------------------------------------------------------------------------

var BUGNUMBER = 616294;

var summary =

  "|delete x| inside a function in eval code, where that eval code includes " +

  "|var x| at top level, actually does delete the binding for x";

print(BUGNUMBER + ": " + summary);

/**************

 * BEGIN TEST *

 **************/

var f;

function testOuterLet()

  return eval("let x; (function() { return delete x; })");

f = testOuterLet();

assertEq(f(), false); // can't delete lexical declarations => false

function testOuterForLet()

  return eval("for (let x; false; ); (function() { return delete x; })");

f = testOuterForLet();

assertEq(f(), true); // not there => true (only non-configurable => false)

function testOuterForInLet()

  return eval("for (let x in {}); (function() { return delete x; })");

f = testOuterForInLet();

assertEq(f(), true); // configurable, so remove => true

assertEq(f(), true); // not there => true (only non-configurable => false)

function testOuterNestedVarInForLet()

  return eval("for (let q = 0; q < 5; q++) { var x; } (function() { return delete x; })");

f = testOuterNestedVarInForLet();

assertEq(f(), true); // configurable, so remove => true

assertEq(f(), true); // there => true

function testArgumentShadowLet()

  return eval("let x; (function(x) { return delete x; })");

f = testArgumentShadowLet();

assertEq(f(), false); // non-configurable argument => false

function testFunctionLocal()

  return eval("(function() { let x; return delete x; })");

f = testFunctionLocal();

assertEq(f(), false); // defined by function code => not configurable => false

/******************************************************************************/

if (typeof reportCompare === "function")

  reportCompare(true, true);

print("All tests passed!");