function helloWorld(stdlib, foreign, heap) {
 "use asm";
 var HEAP64 = new stdlib.Float64Array(heap);
 // this is what we're validating
 function giveThemTheAnswer() {
 var x = 2;
 // for each line below expected behavior to see:
 // type error: unsupported expression;
 x += 2|0;
 x -= 2|0;
 x *= 2|0;
 x /= 2|0;
 x <<= 2|0;
 x >>= 2|0;
 // In reality asm.js doesn't see error above, and ignores it. If I run
 // this code through spider monkey shell (https://archive.mozilla.org/pub/firefox/nightly/latest-mozilla-central/ )
 // ./js -w hello.js
 // I get proper warnings.
 return x|0;
 }
 return { answer: giveThemTheAnswer };
}
print(helloWorld(this, null, new ArrayBuffer(0x10000)).answer());