function move()
{
c_setminmax(me);
set(my,FLAG2);

	while(my.x > posa.x)///this crashes!!
	{
	 c_move (my, vector(20 * time_step, 0, 0), nullvector, IGNORE_PASSABLE | IGNORE_FLAG2);
	 my.pan = 180;
		wait(1);
	}



}

action test_spawn()
{
	while(1)
	{
	ent_create("ship.mdl",vector(my.x,my.y,ship.z),move); 
		wait(-5);
	}

}
action ship_move()
{
	ship = my;

	while(1)
	{
		
	if (key_w) c_move (my, vector(40 * time_step, 0, 0), nullvector,GLIDE | IGNORE_FLAG2);
    	if (key_s) c_move (my, vector(-40 * time_step, 0, 0), nullvector, GLIDE | IGNORE_FLAG2);
    	if (key_d) 	c_move (my, vector(0 ,-40* time_step , 0), nullvector,GLIDE | IGNORE_FLAG2);
    	if (key_a) 	c_move (my, vector(0 , 40* time_step , 0), nullvector,GLIDE | IGNORE_FLAG2);  
    	wait(1);
    	my.pan = 0; my.tilt= 0; my.roll = 0;
    	}

}

ENTITY* enemy;
ENTITY* ship;
ENTITY* pos1;
ENTITY* pos2;
ENTITY* pos3;
ENTITY* pos4;
ENTITY* pos5;
ENTITY* pos6;
ENTITY* pos7;
ENTITY* pos8;
ENTITY* pos9;
ENTITY* pos10;
ENTITY* posa;
ENTITY* posb;
ENTITY* posc;
ENTITY* posd;

action pos1_action()
{
	pos1 = my;
}

action pos2_action()
{
		pos2 = my;
}

action pos3_action()
{
		pos3 = my;
}

action pos4_action()
{
		pos4 = my;
}

action pos5_action()
{
		pos5 = my;
}

action pos6_action()
{
		pos6 = my;
}

action pos7_action()
{
		pos7 = my;
}

action pos8_action()
{
		pos8 = my;
}

action pos9_action()
{
		pos9 = my;
}

action pos10_action()
{
		pos10 = my;
}

action posa_action()
{
		posa = my;
}

action posb_action()
{
		posb = my;
}

action posc_action()
{
		posc = my;
}

action posd_action()
{
		posd = my;
}

ENTITY* enemy;
ENTITY* ship = NULL;
ENTITY* pos1 = NULL;
ENTITY* pos2 = NULL;
ENTITY* pos3 = NULL;
//etc.

function move()
{
  c_setminmax(me);
  set(my,FLAG2);
  while (posa == NULL)
    wait(1);
  while(my.x > posa.x)///this crashes!!
  {
    c_move (my, vector(20 * time_step, 0, 0), nullvector, IGNORE_PASSABLE | IGNORE_FLAG2);
// and the rest of your code.