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DOMParser error detection test suite 
userAgent: "Mozilla/5.0 (Android 7.1.2; Mobile; rv:66.0) Gecko/66.0 Firefox/66.0"
running 2606 tests
2606/2606 tests passed

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const chAt = ``.charCodeAt;

const parseArrayIndex = function(s) {
	/* assumes s is a string

	if s is a valid index, returns parseInt(s)
	otherwise returns some negative integer

	s is valid if:
		/^(0|[1-9][0-9]*)$/.test(s) && 0 <= parseInt(s) <= 0x7fffffff

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/**
 * @class Ext.DomHelper
 * Utility class for working with DOM and/or Templates. It transparently supports using HTML fragments or DOM.<br>
 * This is an example, where an unordered list with 5 children items is appended to an existing element with id 'my-div':<br>
 <pre><code>
var dh = Ext.DomHelper;
var list = dh.append('my-div', {
    id: 'my-ul', tag: 'ul', cls: 'my-list', children: [
        {tag: 'li', id: 'item0', html: 'List Item 0'},
        {tag: 'li', id: 'item1', html: 'List Item 1'},

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(() => {
  var f, g;
  var x = 1;
  f = () => x;
  var x = 2;
  g = () => x;

  console.log(`f(): ${f()}`); // 2
  console.log(`g(): ${g()}`); // 2
})();

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data:application/x-ns-proxy-autoconfig,function%20FindProxyForURL()%20{return%20"HTTPS%20example.com:3128;";}

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$(`.form_datetime`).on(`dp.change`, X =>
	$(`#epoch-start-time`).val(X.date.unix()));

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--------------------------------------------------------------------------------

my ASUS P5Q-Premium, running Debian 8.8, has four ethernet ports. i only need to
use one at a time.

the labels "eth0", "eth1", etc. are assigned to these ports in seemingly random
order, and whether the numbering starts at 0 or 1 seems to be determined by the
presence of some other random PCI device present on the board, so it's hard to
know which eth# you're plugging the cable into.

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set-strictmode -version 'latest'
$erroractionpreference = 'stop'

function main() {
	$a = 'foo'
	$f = {
		$g = {$a}.getnewclosure()
		& $g # "variable '$a' cannot be retrieved because it has not been set."
	}.getnewclosure()
	& $f

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function a($f) {& $f}

function main() {
	$f = {write-host 'success'}
	a {& $f} # stack-overflow
	a {& $f}.getnewclosure() # okay
}

[void] (main)

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# ------------------------------------------------------------------------------

# Leopard Systems ? (2017)
# contributors: Adam Laing

# note: requires powershell 2.0 or later

set-strictmode -version 'latest'
$erroractionpreference = 'stop'