So, I've been encountering this "unsolved constraint for termetric being 
well-founded" error message, and I'm not sure how to fix it.  Does this 
mean that I'm not being strict enough with types?

Here's my code:

absvt@ype mesh

assume mesh =
[v,t:nat]
[vl,tl:addr]
@{
  v=int v, t=int t, vap=arrayptr(vertex, vl, v), tap=arrayptr(uint32, tl, t)
}

implement mesh_print ( m ) = let
  fun vert_print_loop {i,j:int | 0 <= i+1; i+1 <= j} .<i>. ( i: int i, 
v_arr: &(arrayptr(vertex, j)) ): void =
    if not(i < 0) then begin
      vertex_print(v_arr[i]);
      vert_print_loop(i-1, v_arr)
    end else ()
  fun tri_print_loop {i,j:int | 0 <= i+1; i+1 <= j} .<i>. ( i: int i, 
t_arr: &(arrayptr(uint32, j)) ): void =
    if not(i < 0) then begin
      println!(t_arr[i]);
      tri_print_loop(i-1, t_arr)
    end else ()
in
  println!("Num Verts: ", m.v);
  vert_print_loop(m.v-1, m.vap);
  println!("Num Tris: ", m.t);
  println!("Triangle Indicies");
  tri_print_loop(m.t-1, m.tap)
end

Here's the errors:

patscc -tcats /home/tmj90/Goldelish-Engine/source/g_engine.dats
/home/tmj90/Goldelish-Engine/source/g_engine.dats: 67738(line=2381, 
offs=54) -- 67904(line=2385, offs=16): error(3): unsolved constraint for 
termetric being well-founded: C3NSTRprop(C3TKtermet_isnat(); 
S2Eapp(S2Ecst(gte_int_int); S2Evar(i(8786)), S2Eint(0)))
/home/tmj90/Goldelish-Engine/source/g_engine.dats: 67957(line=2386, 
offs=53) -- 68118(line=2390, offs=16): error(3): unsolved constraint for 
termetric being well-founded
typechecking has failed: there are some unsolved constraints: please 
inspect the above reported error message(s) for information.
exit(ATS): uncaught exception: 
_2home_2hwxi_2Research_2ATS_2dPostiats_2src_2pats_error_2esats__FatalErrorExn(1025)

Please ask if you need any additional information.

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