I don't know whether related, closure compiler reports "unreachable code" even for such a simple program as "Hello, world":

package main

func main() {
	println("Hello, world!")
}

main.js:2227: WARNING - unreachable code
		/* */ } return; } if ($f === undefined) { $f = { $blk: $init }; } $f.$s = $s; $f.$r = $r; return $f;
		                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

main.js:2237: WARNING - unreachable code
		/* */ } return; } if ($f === undefined) { $f = { $blk: $init }; } $f.$s = $s; $f.$r = $r; return $f;
		                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

main.js:2333: WARNING - unreachable code
		/* */ } return; } if ($f === undefined) { $f = { $blk: $init }; } $f.$s = $s; $f.$r = $r; return $f;

2224: $pkg.$init = function() {};
2225: /* */ var $f, $c = false, $s = 0, $r; if (this !== undefined && this.$blk !== undefined) { $f = this; $c = true; $s = $f.$s; $r = $f.$r; } s: while (true) { switch ($s) { case 0:
2226: init();
2227: /* */ } return; } if ($f === undefined) { $f = { $blk: $init }; } $f.$s = $s; $f.$r = $r; return $f;

And when the compiler is started with ADVANCED compilation level (as shown below), it also shows tons of warnings about "incorrect number of parameters" and something about "instantiation of non-constructor". Cannot say whether those are false positives though.

java -jar ~/closure.jar --js main.js --js_output_file main.min.js --compilation_level ADVANCED_OPTIMIZATIONS

A lot of "unreachable code" warnings on Firefox #575

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