issue_1639_1: {
    options = {
        booleans: true,
        collapse_vars: true,
        conditionals: true,
        evaluate: true,
        join_vars: true,
        loops: true,
        sequences: true,
        side_effects: true,
    }
    input: {
        var a = 100, b = 10;

        var L1 = 5;
        while (--L1 > 0) {
            if ((--b), false) {
                if (b) {
                    var ignore = 0;
                }
            }
        }

        console.log(a, b);
    }
    expect: {
        for (var a = 100, b = 10, L1 = 5; --L1 > 0;)
            if (--b, 0) var ignore = 0;
        console.log(a, b);
    }
    expect_stdout: true
}

issue_1639_2: {
    options = {
        booleans: true,
        collapse_vars: true,
        conditionals: true,
        evaluate: true,
        join_vars: true,
        sequences: true,
        side_effects: true,
    }
    input: {
        var a = 100, b = 10;

        function f19() {
            if (++a, false)
                if (a)
                    if (++a);
        }
        f19();

        console.log(a, b);
    }
    expect: {
        var a = 100, b = 10;
        function f19() {
            ++a, 0;
        }
        f19(),
        console.log(a, b);
    }
    expect_stdout: true
}

issue_1639_3: {
    options = {
        booleans: true,
        collapse_vars: true,
        conditionals: true,
        evaluate: true,
        sequences: true,
        side_effects: true,
    }
    input: {
        var a = 100, b = 10;
        a++ && false && a ? 0 : 0;
        console.log(a, b);
    }
    expect: {
        var a = 100, b = 10;
        a++,
        console.log(a, b);
    }
    expect_stdout: true
}
lue='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=21890aad50acc65bc29c3310036d1b1d273c0250'>root</a>/<a href='/guix/log/TODO?id=21890aad50acc65bc29c3310036d1b1d273c0250'>TODO</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/TODO?id=21890aad50acc65bc29c3310036d1b1d273c0250&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2019-01-21 09:59:41 +0100'>2019-01-21</span></td><td><a href='/guix/commit/TODO?id=b93d2602f72dbbd9334a4f5c75b8721e1f2fa35a'>Update 'TODO'</a><span class='msg-avail'>...<span class='msg-tooltip'>* TODO (Installer): Add Pierre Neidhardt suggestions described here:
  https://lists.gnu.org/archive/html/guix-devel/2019-01/msg00305.html
</span></span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2019-01-17 14:11:15 +0100'>2019-01-17</span></td><td><a href='/guix/commit/TODO?id=11b68c90cd89288906c595d5c31a0413ed8a496f'>Update 'TODO'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* TODO (Installer): New section.
</span></span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2016-09-01 14:57:03 +0200'>2016-09-01</span></td><td><a href='/guix/commit/TODO?id=e5cd149f681cc8d285da6c7638b70a43b333f337'>Update 'TODO'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* TODO: Remove items about guix challenge &amp; guix publish.

Signed-off-by: Vincent Legoll &lt;vincent.legoll@gmail.com&gt;
Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Vincent Legoll</td></tr>
<tr><td><span title='2014-09-16 21:11:03 +0200'>2014-09-16</span></td><td><a href='/guix/commit/TODO?id=d6af2518681643a170796ca8e267cc8097f910f1'>Remove outdated items from 'TODO'.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2014-04-29 17:59:23 +0200'>2014-04-29</span></td><td><a href='/guix/commit/TODO?id=0423b7847baccf630349a5fc6bfa3317936467ef'>Update 'TODO'.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2013-12-22 01:11:12 +0100'>2013-12-22</span></td><td><a href='/guix/commit/TODO?id=d6b5e4bbbdc69f78ccccf0186153d0744b7f399d'>Update 'TODO'.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2013-12-20 00:37:41 +0100'>2013-12-20</span></td><td><a href='/guix/commit/TODO?id=971cb56dd0c1a1cb265d2adfe41730cd2f8c5c22'>Update 'TODO'.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2013-10-09 00:12:46 +0200'>2013-10-09</span></td><td><a href='/guix/commit/TODO?id=470d08ffccd95673545cf13aacd918d4eb5fa977'>Update 'TODO'.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2013-10-06 22:55:36 +0200'>2013-10-06</span></td><td><a href='/guix/commit/TODO?id=5d388c7c3f31b956182f7f88cc06896cba28d9bf'>Augment 'TODO'.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2013-08-23 11:37:10 +0200'>2013-08-23</span></td><td><a href='/guix/commit/TODO?id=290d437097094f82e53eac602b7a6b6037e89f2a'>Add TODO item.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2013-07-19 23:22:59 +0200'>2013-07-19</span></td><td><a href='/guix/commit/TODO?id=3dfd7cef0dc7b868354cbbc9ca30d837a3a8b30d'>Update `TODO'.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2013-07-03 01:18:28 +0200'>2013-07-03</span></td><td><a href='/guix/commit/TODO?id=423002544d7f1b57c361445c65dfcdd905b07ac2'>Update `NEWS' and `TODO'.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2013-06-14 17:05:49 +0200'>2013-06-14</span></td><td><a href='/guix/commit/TODO?id=3e5980de4724eaeff19d914ad07f944faf4abd3c'>Update `TODO'.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2013-05-17 23:15:49 +0200'>2013-05-17</span></td><td><a href='/guix/commit/TODO?id=499b8d1f845cfea3e4a2258c7ae55fc823d6f5f0'>Update `TODO'.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2013-05-10 21:08:01 +0200'>2013-05-10</span></td><td><a href='/guix/commit/TODO?id=8c247e1c473d478287ebf2829475259ba3ee7780'>Update `TODO'.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2013-04-12 17:31:05 +0200'>2013-04-12</span></td><td><a href='/guix/commit/TODO?id=9297c90b69ba2d1f504f8c63b92510806615847d'>Update `TODO'.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2013-03-27 00:11:57 +0100'>2013-03-27</span></td><td><a href='/guix/commit/TODO?id=da0a26d2a7df8b8f269aa05a7bd13add97df5658'>Update `TODO'.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2013-02-17 13:23:45 -0500'>2013-02-17</span></td><td><a href='/guix/commit/TODO?id=d8f257f99e0e3925b46898c1579ebfaaaad75094'>Update `TODO'.</a></td><td>Mark H Weaver</td></tr>