Debugging compiled JS. "compiled"; on first line, but board warns that it's not compiled

So I'm trying to use compiled JS for the animation code for my PingPong lights. I decided to try compiled JS to see if I can get enough performance to animate a longer string of lights without having to abandon Espruino and reimplement this in C on an AVR co-processor or something.

So I put "compiled"; as the first line of the function. I connect to my Espruino Pico, and click "send to Espruino". I am given the warning that a function arrived on the Espruino board with "compiled" as the first line.

No errors pop up in the IDE.

What am I doing wrong?

I2C1.setup({scl:B6,sda:B7});

var eeprom=require("AT24").connect(I2C1, 128, 512);

numleds=10;

//global functions
function animate() {
  setTimeout("animate()",20);
  var x;
  if (leds.animode) {x=getTime();}
  leds.flip();
  leds.dotwinkle();
  if (leds.animode) {console.log(getTime()-x);}
}

 //512kbit
var memmap={
	slen:32,
	rlen:40,
	statOff:0x2000,
	statMax:192,
	sEep:eeprom,
	oEep:eeprom,
	oOff:0x8000,
	oMax:1024,
	oIEE:eeprom,
	oIOF:0,
	scEE:eeprom,
	scOF:0x1000,
	scMX:64
};

// LEDS
gtab=new Uint16Array(256); //snip to make fit in forums
var leds = {};
leds.map=memmap;
leds.spi=SPI1;
leds.num=numleds;
leds.afr=0;
leds.ison=1;
leds.animode=0;
leds.aniframe=0;
leds.anilast=0;
leds.aniaddr=0;
leds.zz="\x00\x00";
leds.sceneid=0;
leds.lastscene=0;
leds.scenetime=0;

/* 
Animation functions, dotwinkle and flip, are located here. 
*/


leds.dotwinkle = function () {
	"compiled";
	var t=this.t;
	var tm= this.tm;
	var ta=this.ta;
	var ti=this.ti;
	var b=this.buff;
	var z=this.tbuf;
	var o=this.overlay;
	if (this.animode) {
		if (this.aniframe > this.anilast) {
			this.animode=0;
			this.anilast=0;
			this.aniframe=0;
			leds.aniaddr=0;
			this.overlay.fill(0);
		} else {
			this.overlay=this.map.oEep.read(this.aniaddr+this.map.slen*this.aniframe++,this.num*3);
		}
	}
	if (this.animode & 4 ){
		leds.tclb.set(o);
    } else if (this.animode & 2){
        for (var i=0;i<30;i++){
          leds.tclb[i]=b[i]+t[i]+o[i];
        }
	} else {
		for (var i=0;i<30;i++){
			var mode=tm[i];
			var mo=mode&0x03;
			var s=1+((mode&12)>>2);
			var pr=mode>>4;
			if (!(this.animode&2)) {
				if (mo==1) { //0x01 - high nybble is chance to change, from 0 (1/16) to 15 (16/16 chance to change)
					var n=Math.random(); //3ms
					var th=(pr+1)/32;
	      				if (n<0.5+th){ //8ms
	      					if(n<=(0.5-th) && t[i]>ti[i]){t[i]-=s;}
		      			} else {
	      					if (t[i]<ta[i]){t[i]+=s;}
	      				}
				} else if (mo==2) { //fade/pulse. 
	          			if (this.afr%((1+pr)&7)==0){
	            				t[i]=E.clip(t[i]+pr&8?s:-1*s,ti[i],ta[i]);
						if (t[i] == ti[i] || t[i] == ta[i]) {
							tm[i]=mode^128;
						}
	        			}
				} else {
					if (t[i]!==0){if(t[i]>0){t[i]--;} else {t[i]++;}}
				}
			}
			var c=b[i];
			if (mo || this.afr%((1+pr)&7)==0) {
				b[i]+=E.clip(z[i]-c,-1,1);
			}
			leds.tclb[i]=c+(c?t[i]:0)+o[i]; //10ms
		}
	}
	this.afr=this.afr==255?0:this.afr+1;
};

leds.flip = function () {
	var j=0;
	var i=0;
	var z=leds.num*3;
	while (i<z) {
      var rch=gtab[leds.tclb[i++]];
		var gch=gtab[leds.tclb[i++]];
		var bch=gtab[leds.tclb[i++]];
		
		var ma = Math.max(rch,gch,bch);
		var mult=1;
        var gdim=31;
		
			if (ma <390) {
				gdim=3;
				mult=10.33;
			} else if (ma <700) {
				gdim=7;
				mult=4.4;
			} else if (ma <1700) {
				gdim=15;
				mult=2.06;
			} 
		
		this.fbuf[j++]=(this.ison?(gdim|224):224);
		this.fbuf[j++]=(bch?Math.max((bch*mult)>>4,1):0);
		this.fbuf[j++]=(gch?Math.max((gch*mult)>>4,1):0);
		this.fbuf[j++]=(rch?Math.max((rch*mult)>>4,1):0);

	}

	this.spi.write(0,0,0,0,this.fbuf,0xFF,0xFF,0xFF,0xFF);
};

//snip - a whole bunch of functions that set values in these arrays

How do I know if the problem is with the IDE failing to recognize that the thing should be compiled (for example, it thinks it's not running on a Pico, but rather some other board that doesn't support compiled JS?) or a problem with my code (something in it that prevents it from being compiled)?