Comments right before a if/while/... statement are restored twice and messily

[fflorent]

The two lines below (with the comment):

// restored twice and messily
if (document.querySelector("p").textContent=.replace("foo", "bar"));

Are compiled to:

if (function () {
        var lhsContext    // restored twice and messily
 = // restored twice and messily
        document.querySelector('p');
        return lhsContext.textContent = lhsContext.textContent.replace('foo', 'bar');
    }());

(demo)
Florent