diff --git a/src/passes/09-typing/08-typer-new/heuristic_break_ctor.ml b/src/passes/09-typing/08-typer-new/heuristic_break_ctor.ml
index df54b41c8..d140ecdc3 100644
--- a/src/passes/09-typing/08-typer-new/heuristic_break_ctor.ml
+++ b/src/passes/09-typing/08-typer-new/heuristic_break_ctor.ml
@@ -36,6 +36,9 @@ let propagator : output_break_ctor propagator =
 
   (* a.tv = b.tv *)
   let eq1 = c_equation { tsrc = "solver: propagator: break_ctor a" ; t = P_variable a.tv} { tsrc = "solver: propagator: break_ctor b" ; t = P_variable b.tv} "propagator: break_ctor" in
+  let () = if Ast_typed.Debug.debug_new_typer then
+           let p = Ast_typed.PP_generic.c_constructor_simpl in
+           Format.printf "\npropagator_break_ctor\na = %a\nb = %a\n%!" p a p b in
   (* a.c_tag = b.c_tag *)
   if (Solver_should_be_generated.compare_simple_c_constant a.c_tag b.c_tag) <> 0 then
     failwith (Format.asprintf "type error: incompatible types, not same ctor %a vs. %a (compare returns %d)"
diff --git a/src/passes/09-typing/08-typer-new/heuristic_specialize1.ml b/src/passes/09-typing/08-typer-new/heuristic_specialize1.ml
index 8d82cfd3f..d9c3563c1 100644
--- a/src/passes/09-typing/08-typer-new/heuristic_specialize1.ml
+++ b/src/passes/09-typing/08-typer-new/heuristic_specialize1.ml
@@ -48,6 +48,7 @@ let propagator : output_specialize1 propagator =
       t = P_apply { tf   = { tsrc = "solver: propagator: specialize1 tf"   ; t = P_forall a.forall            };
                     targ = { tsrc = "solver: propagator: specialize1 targ" ; t = P_variable fresh_existential }} } in
   let (reduced, new_constraints) = Typelang.check_applied @@ Typelang.type_level_eval apply in
+  (if Ast_typed.Debug.debug_new_typer then Format.printf "apply = %a\nb = %a\nreduced = %a\nnew_constraints = [\n%a\n]\n" Ast_typed.PP_generic.type_value apply Ast_typed.PP_generic.c_constructor_simpl b Ast_typed.PP_generic.type_value reduced (PP_helpers.list_sep Ast_typed.PP_generic.type_constraint (fun ppf () -> Format.fprintf ppf " ;\n")) new_constraints);
   let eq1 = c_equation { tsrc = "solver: propagator: specialize1 eq1" ; t = P_variable b.tv } reduced "propagator: specialize1" in
   let eqs = eq1 :: new_constraints in
   (eqs, []) (* no new assignments *)
diff --git a/src/passes/09-typing/08-typer-new/normalizer.ml b/src/passes/09-typing/08-typer-new/normalizer.ml
index 5c6549c03..ecd0c8a5a 100644
--- a/src/passes/09-typing/08-typer-new/normalizer.ml
+++ b/src/passes/09-typing/08-typer-new/normalizer.ml
@@ -114,7 +114,7 @@ let rec normalizer_simpl : (type_constraint , type_constraint_simpl) normalizer
   | C_equation {aval=({ tsrc = _ ; t = P_apply _ } as a); bval=(_ as b)}               -> reduce_type_app b a
   (* break down (TC(args)) into (TC('a, …) and ('a = arg) …) *)
   | C_typeclass { tc_args; typeclass }                              -> split_typeclass tc_args typeclass
-  | C_access_label { c_access_label_tval; accessor; c_access_label_tvar } -> let _todo = ignore (c_access_label_tval, accessor, c_access_label_tvar) in failwith "TODO" (* tv, label, result *)
+  | C_access_label { c_access_label_tval; accessor; c_access_label_tvar } -> let _todo = ignore (c_access_label_tval, accessor, c_access_label_tvar) in failwith "TODO C_access_label" (* tv, label, result *)
 
 let normalizers : type_constraint -> structured_dbs -> (structured_dbs , 'modified_constraint) state_list_monad =
   fun new_constraint dbs ->
diff --git a/src/passes/09-typing/08-typer-new/solver.ml b/src/passes/09-typing/08-typer-new/solver.ml
index 747e56e4d..06ada30f0 100644
--- a/src/passes/09-typing/08-typer-new/solver.ml
+++ b/src/passes/09-typing/08-typer-new/solver.ml
@@ -45,6 +45,15 @@ let select_and_propagate : ('old_input, 'selector_output) selector -> 'selector_
      (* Call the propagation rule *)
      let (new_constraints , new_assignments) = List.split @@ List.map (propagator dbs) selected_outputs in
      (* return so that the new constraints are pushed to some kind of work queue and the new assignments stored *)
+let () =
+  (if Ast_typed.Debug.debug_new_typer && false then
+   let s str = (fun ppf () -> Format.fprintf ppf str) in
+   Format.printf "propagator produced\nnew_constraints = %a\nnew_assignments = %a\n"
+     (PP_helpers.list_sep (PP_helpers.list_sep Ast_typed.PP_generic.type_constraint (s "\n")) (s "\n"))
+     new_constraints
+     (PP_helpers.list_sep (PP_helpers.list_sep Ast_typed.PP_generic.c_constructor_simpl (s "\n")) (s "\n"))
+     new_assignments)
+in
      (already_selected , List.flatten new_constraints , List.flatten new_assignments)
   | WasNotSelected ->
      (already_selected, [] , [])
diff --git a/src/passes/09-typing/08-typer-new/typer.ml b/src/passes/09-typing/08-typer-new/typer.ml
index 3b92319f2..33462feae 100644
--- a/src/passes/09-typing/08-typer-new/typer.ml
+++ b/src/passes/09-typing/08-typer-new/typer.ml
@@ -455,16 +455,20 @@ let type_and_subst_xyz
       (apply_substs : ('b , Typer_common.Errors.typer_error) Typesystem.Misc.Substitution.Pattern.w)
       (type_xyz_returns_state : (environment * O'.typer_state * 'a) -> (environment * O'.typer_state * 'b , typer_error) Trace.result)
     : ('b * O'.typer_state , typer_error) result =
+  let () = (if Ast_typed.Debug.debug_new_typer then Printf.printf "\nTODO AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA Print env_state_node here.\n\n") in
+  let () = (if Ast_typed.Debug.debug_new_typer then print_env_state_node in_printer env_state_node) in
   let%bind (env, state, node) = type_xyz_returns_state env_state_node in
   let subst_all =
     let aliases = state.structured_dbs.aliases in
     let assignments = state.structured_dbs.assignments in
     let substs : variable: I.type_variable -> _ = fun ~variable ->
       to_option @@
+      let () = (if Ast_typed.Debug.debug_new_typer then Printf.printf "%s" @@ Format.asprintf "TRY   %a\n" Var.pp variable) in
       let%bind root =
         trace_option (corner_case (Format.asprintf "can't find alias root of variable %a" Var.pp variable)) @@
           (* TODO: after upgrading UnionFind, this will be an option, not an exception. *)
           try Some (Solver.UF.repr variable aliases) with Not_found -> None in
+      let () = (if Ast_typed.Debug.debug_new_typer then Printf.printf "%s" @@ Format.asprintf "TRYR  %a (%a)\n" Var.pp variable Var.pp root) in
       let%bind assignment =
         trace_option (corner_case (Format.asprintf "can't find assignment for root %a" Var.pp root)) @@
           (Map.find_opt root assignments) in
@@ -472,11 +476,14 @@ let type_and_subst_xyz
       let () = ignore tv (* I think there is an issue where the tv is stored twice (as a key and in the element itself) *) in
       let%bind (expr : O.type_content) = trace_option (corner_case "wrong constant tag") @@
         Typesystem.Core.type_expression'_of_simple_c_constant (c_tag , (List.map (fun s -> O.t_variable s ()) tv_list)) in
+      let () = (if Ast_typed.Debug.debug_new_typer then Printf.printf "%s" @@ Format.asprintf "SUBST %a (%a is %a)\n" Var.pp variable Var.pp root Ast_typed.PP_generic.type_content expr) in
       ok @@ expr
     in
     let p = apply_substs ~substs node in
     p in
   let%bind node = subst_all in
+  let () = (if Ast_typed.Debug.debug_new_typer then Printf.printf "\nTODO AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA Print env,state,node here again.\n\n") in
+  let () = (if Ast_typed.Debug.debug_new_typer then print_env_state_node out_printer (env, state, node)) in
   let () = ignore env in        (* TODO: shouldn't we use the `env` somewhere? *)
   ok (node, state)
 
diff --git a/src/stages/2-ast_imperative/PP.ml b/src/stages/2-ast_imperative/PP.ml
index 2853dd37e..0bb99ad44 100644
--- a/src/stages/2-ast_imperative/PP.ml
+++ b/src/stages/2-ast_imperative/PP.ml
@@ -71,7 +71,7 @@ let rec expression ppf (e : expression) =
 and expression_content ppf (ec : expression_content) =
   match ec with
   | E_literal l ->
-      literal ppf l
+      fprintf ppf "%a" literal l
   | E_variable n ->
       fprintf ppf "%a" expression_variable n
   | E_application {lamb;args} ->
diff --git a/src/stages/5-ast_typed/ast_typed.ml b/src/stages/5-ast_typed/ast_typed.ml
index 99f048844..561e3f694 100644
--- a/src/stages/5-ast_typed/ast_typed.ml
+++ b/src/stages/5-ast_typed/ast_typed.ml
@@ -17,5 +17,6 @@ module Helpers = Helpers
 include Types
 include Misc
 include Combinators
+module Debug = Stage_common.Debug
 
 let program_environment env program = fst (Compute_environment.program env program)
diff --git a/src/stages/common/ast_common.ml b/src/stages/common/ast_common.ml
index 605fd90c8..43676422b 100644
--- a/src/stages/common/ast_common.ml
+++ b/src/stages/common/ast_common.ml
@@ -3,3 +3,4 @@ include Types
 module Types = Types
 module PP = PP
 module Helpers = Helpers
+module Debug = Debug
diff --git a/src/stages/common/debug.ml b/src/stages/common/debug.ml
new file mode 100644
index 000000000..6e435e395
--- /dev/null
+++ b/src/stages/common/debug.ml
@@ -0,0 +1 @@
+let debug_new_typer = false
diff --git a/src/stages/typesystem/core.ml b/src/stages/typesystem/core.ml
index eb707b5f5..413613104 100644
--- a/src/stages/typesystem/core.ml
+++ b/src/stages/typesystem/core.ml
@@ -27,8 +27,10 @@ type type_variable = Ast_typed.type_variable
 type type_expression = Ast_typed.type_expression
 
 (* generate a new type variable and gave it an id *)
-let fresh_type_variable : ?name:string -> unit -> type_variable =
-    Var.fresh
+let fresh_type_variable : ?name:string -> unit -> type_variable = fun ?name () ->
+  let fresh_name = Var.fresh ?name () in
+  let () = (if Ast_typed.Debug.debug_new_typer && false then Printf.printf "Generated variable %s\n%!%s\n%!" (Var.debug fresh_name) (Printexc.get_backtrace ())) in
+  fresh_name
 
 let type_expression'_of_simple_c_constant : constant_tag * type_expression list -> Ast_typed.type_content option = fun (c, l) ->
   match c, l with
diff --git a/src/test/test_helpers.ml b/src/test/test_helpers.ml
index 9ed64a53c..ca68a94b9 100644
--- a/src/test/test_helpers.ml
+++ b/src/test/test_helpers.ml
@@ -98,7 +98,9 @@ let typed_program_with_imperative_input_to_michelson
   let env = Ast_typed.program_environment Environment.default program in
   let%bind sugar            = Compile.Of_imperative.compile_expression input in
   let%bind core             = Compile.Of_sugar.compile_expression sugar in
+let () = (if Ast_typed.Debug.debug_new_typer then Printf.printf "\nINPUT = %s\n\n%!" (Format.asprintf "%a" Ast_core.PP.expression core)) in
   let%bind app              = Compile.Of_core.apply entry_point core in
+let () = (if Ast_typed.Debug.debug_new_typer then Format.printf "\n\nSTATE IZ=%a\n\n" Typesystem.Solver_types.pp_typer_state state) in
   let%bind (typed_app,new_state)    = Compile.Of_core.compile_expression ~env ~state app in
   let () = Typer.Solver.discard_state new_state in
   let%bind compiled_applied = Compile.Of_typed.compile_expression typed_app in
diff --git a/vendors/ligo-utils/simple-utils/var.ml b/vendors/ligo-utils/simple-utils/var.ml
index 490d3430f..8aa5b3b92 100644
--- a/vendors/ligo-utils/simple-utils/var.ml
+++ b/vendors/ligo-utils/simple-utils/var.ml
@@ -47,3 +47,5 @@ let fresh ?name () =
 
 let fresh_like v =
   fresh ~name:v.name ()
+
+let debug v = match v.counter with Some c -> Printf.sprintf "%s(%d)" v.name c | None -> Printf.sprintf "%s(None)" v.name
diff --git a/vendors/ligo-utils/simple-utils/var.mli b/vendors/ligo-utils/simple-utils/var.mli
index 6d4936761..d81d69548 100644
--- a/vendors/ligo-utils/simple-utils/var.mli
+++ b/vendors/ligo-utils/simple-utils/var.mli
@@ -43,3 +43,5 @@ val fresh_like : 'a t -> 'b t
 (* Reset the global counter. Danger, do not use... Provided for tests
    only. *)
 val reset_counter : unit -> unit
+
+val debug : 'a t -> string