TOUCH_INVALID_TEXCOORD not recognised

I'm running this test script below from Wiki - line 12 "else if (touchedpos == TOUCH_INVALID_TEXCOORD)" comes up with a name not defined in scope - yet TOUCH_INVALID_TEXCOORD is meant to be a LSL constant (I'm using the latest viewer 1.21 I think it is)

"The vector constant TOUCH_INVALID_TEXCOORD has the value <-1.0, -1.0, 0.0>"

anyone else had this problem?



vector touchedpos;

default {

touch_start(integer num_detected) {
integer i = 0;
for(; i < num_detected; ++i ) {
touchedpos = llDetectedTouchST(i);

if (llDetectedTouchFace(i) == -1) {
llWhisper(0, "Sorry, your viewer doesn't support touched faces.";
}
else if (touchedpos == TOUCH_INVALID_TEXCOORD)
{
llWhisper(0, "Sorry, the surface touch position could not be determined.";
}
else {
llWhisper(0, (string) touchedpos);
}
} // while ...
} // touch_start

}

The constant isn't yet enabled on the servers, so we can't use it yet even though the viewer already knows to highlight it.

(Starting with the 1.21 viewer, compilation is done on the server, and what the viewer knows doesn't really matter except to make things pretty in the editor).

Thanks for that