trailing space after escaped string

[Soviut]

I'm using the function hack to do some simple inline calculations and noticed that the escaped string keeps adding a trailing space when compiled. This makes it impossible to put units after it:

@fn: `fn = function(a) { return a * 2; }`;

a {
  width: `fn(25)`px;
}

Compiles to the following, note the space between the value and the px units:

a {
  width: 50 px;
}

[Soviut]

Accidentally posted to the wrong repo, this was intended for less.js