A recursive runaway function that will normally error when entered directly, does not error when enclosed in an environment supplied ('special') function.  Example code:

mouseClicked = function(){

   var z = 0;
   fill(0);

   var stackKiller = function(){
       background(255);
       text(z++, 20, 20);
       stackKiller();  // recursive error
   };

   // kaboom!
   stackKiller();

};

Clicking on the mouse in that program should produce an error, but does not (currently).

If you move the above mouseClicked code to outside of the mouseClicked function, the expected 'maximum stack size exceed' error will be reported.  This seems to be true for all environment functions except the draw function which does report the error.  MouseClicked, mousePressed, mouseDragged, keyPressed, were all tested and exhibited this same behavior.