keep_var_for_in: {
    options = {
        hoist_vars: true,
        unused: true,
    }
    input: {
        (function(obj){
            var foo = 5;
            for (var i in obj)
                return foo;
        })();
    }
    expect: {
        (function(obj){
            var i, foo = 5;
            for (i in obj)
                return foo;
        })();
    }
}
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<div class='path'>path: <a href='/guix/log/?id=60ba9d8c2c95fa2cc1096ddb718eba88df689123'>root</a>/<a href='/guix/log/gnu?id=60ba9d8c2c95fa2cc1096ddb718eba88df689123'>gnu</a>/<a href='/guix/log/gnu/packages?id=60ba9d8c2c95fa2cc1096ddb718eba88df689123'>packages</a>/<a href='/guix/log/gnu/packages/assembly.scm?id=60ba9d8c2c95fa2cc1096ddb718eba88df689123'>assembly.scm</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/gnu/packages/assembly.scm?id=60ba9d8c2c95fa2cc1096ddb718eba88df689123&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2019-10-21 18:20:39 +0100'>2019-10-21</span></td><td><a href='/guix/commit/gnu/packages/assembly.scm?id=e9d48bdad4766c4043a21b4765f6ea2e87ff6e88'>gnu: yasm: Disable parallel tests.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/assembly.scm (yasm)[arguments]: Set #:parallel-tests? to #f.
</span></span></td><td>Christopher Baines</td></tr>
<tr><td><span title='2019-10-12 16:29:49 +0200'>2019-10-12</span></td><td><a href='/guix/commit/gnu/packages/assembly.scm?id=bae08e22dc9eba5a460d3e0270c1b153d3021060'>gnu: lightning: Update to 2.1.3.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/assembly.scm (lightning): Update to 2.1.3.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2019-05-25 00:25:15 +0200'>2019-05-25</span></td><td><a href='/guix/commit/gnu/packages/assembly.scm?id=57df83e07d4b5e78d9a54c1a88d05b4a9ed65714'>Merge branch 'staging' into core-updates</a></td><td>Marius Bakke</td></tr>
<tr><td><span title='2019-05-24 18:24:16 +0200'>2019-05-24</span></td><td><a href='/guix/commit/gnu/packages/assembly.scm?id=43675ac77ad7708814f4152e5bce25fe453b8f4f'>gnu: Add libjit.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/assembly.scm (libjit): Add at 0.1.4

Co-authored-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Andy Tai</td></tr>
<tr><td><span title='2019-05-08 23:21:34 +0200'>2019-05-08</span></td><td><a href='/guix/commit/gnu/packages/assembly.scm?id=d21649440b9826be41872f0a36792d56939470da'>gnu: fasm: Update to 1.73.11.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/assembly.scm (fasm): Update to 1.73.11.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2019-05-01 23:11:41 +0200'>2019-05-01</span></td><td><a href='/guix/commit/gnu/packages/assembly.scm?id=3b458d5462e6bbd852c2dc5c6670d5655abf53f5'>Merge branch 'master' into core-updates</a></td><td>Marius Bakke</td></tr>
<tr><td><span title='2019-04-11 05:32:49 +0200'>2019-04-11</span></td><td><a href='/guix/commit/gnu/packages/assembly.scm?id=819cba3cd8d1042fdfdf6a381655e71406eaa4de'>gnu: fasm: Update to 1.73.10.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/assembly.scm (fasm): Update to 1.73.10.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2019-03-10 18:49:59 +0100'>2019-03-10</span></td><td><a href='/guix/commit/gnu/packages/assembly.scm?id=9ded89fd7c064ce360d5dd13343d0f06cd48a1a1'>gnu: nasm: Update to 2.14.02.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/assembly.scm (nasm): Update to 2.14.02.
</span></span></td><td>Marius Bakke</td></tr>