================================================================================
Desugared:
Rec {
ds_dsc  :: 
    _forall_
    [t{-anl-} t{-ann-}]
    =>
    (t{-anl-} -> t{-ann-}, t{-anl-} -> t{-ann-})
{-# L #-}
ds_dsc =
    _/\_ t{-anl-} t{-ann-} ->
	_letrec_ {
	  g4_an6  :: 
	      t{-anl-} -> t{-ann-}
	  {-# L #-}
	  g4_an6 =
	      \ y_r3w  :: 
		    t{-anl-}
		{-# L #-}
		y_r3w ->
		  f4_an7
		      y_r3w;
	  f4_an7  :: 
	      t{-anl-} -> t{-ann-}
	  {-# L #-}
	  f4_an7 =
	      \ x_r3y  :: 
		    t{-anl-}
		{-# L #-}
		x_r3y ->
		  g4_an6
		      x_r3y;
	} in 
	  PrelTup.(,){-62,p-}{i}
	      {_@_ (t{-anl-} -> t{-ann-})
	       _@_ (t{-anl-} -> t{-ann-})
	       g4_an6
	       f4_an7}
g4{-r3A,x-}  :: 
    _forall_ [t{-anl-} t{-ann-}] => t{-anl-} -> t{-ann-}
{-# L #-}
g4{-r3A,x-} =
    _/\_ t{-anl-} t{-ann-} ->
	case
	    ds_dsc
		_@_ t{-anl-} _@_ t{-ann-}
	of {
	PrelTup.(,){-62,p-}{i} ds_dth ds_dti  ->
	ds_dth;}
f4{-r3z,x-}  :: 
    _forall_ [t{-anl-} t{-ann-}] => t{-anl-} -> t{-ann-}
{-# L #-}
f4{-r3z,x-} =
    _/\_ t{-anl-} t{-ann-} ->
	case
	    ds_dsc
		_@_ t{-anl-} _@_ t{-ann-}
	of {
	PrelTup.(,){-62,p-}{i} ds_dtB ds_dtA  ->
	ds_dtA;}
end Rec }
Rec {
ds_dtM  :: 
    _forall_
    [t{-anE-} t{-anG-}]
    =>
    (t{-anE-} -> t{-anG-}, t{-anE-} -> t{-anG-})
{-# L #-}
ds_dtM =
    _/\_ t{-anE-} t{-anG-} ->
	_letrec_ {
	  f3_anp  :: 
	      t{-anE-} -> t{-anG-}
	  {-# L #-}
	  f3_anp =
	      \ x_r3s  :: 
		    t{-anE-}
		{-# L #-}
		x_r3s ->
		  g3_anq
		      x_r3s;
	  g3_anq  :: 
	      t{-anE-} -> t{-anG-}
	  {-# L #-}
	  g3_anq =
	      \ y_r3u  :: 
		    t{-anE-}
		{-# L #-}
		y_r3u ->
		  f3_anp
		      y_r3u;
	} in 
	  PrelTup.(,){-62,p-}{i}
	      {_@_ (t{-anE-} -> t{-anG-})
	       _@_ (t{-anE-} -> t{-anG-})
	       f3_anp
	       g3_anq}
f3{-r3C,x-}  :: 
    _forall_ [t{-anE-} t{-anG-}] => t{-anE-} -> t{-anG-}
{-# L #-}
f3{-r3C,x-} =
    _/\_ t{-anE-} t{-anG-} ->
	case
	    ds_dtM
		_@_ t{-anE-} _@_ t{-anG-}
	of {
	PrelTup.(,){-62,p-}{i} ds_duR ds_duS  ->
	ds_duR;}
g3{-r3B,x-}  :: 
    _forall_ [t{-anE-} t{-anG-}] => t{-anE-} -> t{-anG-}
{-# L #-}
g3{-r3B,x-} =
    _/\_ t{-anE-} t{-anG-} ->
	case
	    ds_dtM
		_@_ t{-anE-} _@_ t{-anG-}
	of {
	PrelTup.(,){-62,p-}{i} ds_dvb ds_dva  ->
	ds_dva;}
end Rec }
g2{-r3E,x-}  :: 
    _forall_ [t{-anO-}] => t{-anO-} -> t{-anO-}
{-# L #-}
g2{-r3E,x-} =
    _/\_ t{-anO-} -> \ y_r3o  :: 
			   t{-anO-}
		       {-# L #-}
		       y_r3o ->
	y_r3o
f2{-r3D,x-}  :: 
    _forall_ [t{-anU-}] => t{-anU-} -> t{-anU-}
{-# L #-}
f2{-r3D,x-} =
    _/\_ t{-anU-} -> \ x_r3q  :: 
			   t{-anU-}
		       {-# L #-}
		       x_r3q ->
	g2{-r3E,x-}
	    _@_ t{-anU-} x_r3q
g1{-r3F,x-}  :: 
    _forall_ [t{-ao4-}] => t{-ao4-} -> t{-ao4-}
{-# L #-}
g1{-r3F,x-} =
    _/\_ t{-ao4-} -> \ y_r3m  :: 
			   t{-ao4-}
		       {-# L #-}
		       y_r3m ->
	y_r3m
f1{-r3G,x-}  :: 
    _forall_ [t{-aoa-}] => t{-aoa-} -> t{-aoa-}
{-# L #-}
f1{-r3G,x-} =
    _/\_ t{-aoa-} -> \ x_r3k  :: 
			   t{-aoa-}
		       {-# L #-}
		       x_r3k ->
	g1{-r3F,x-}
	    _@_ t{-aoa-} x_r3k

NOTE: Simplifier still going after 4 iterations; bailing out.