diff --git a/src/boot/driver/lib.ml b/src/boot/driver/lib.ml
index 3b3ee72d700..0d0e93be15e 100644
--- a/src/boot/driver/lib.ml
+++ b/src/boot/driver/lib.ml
@@ -109,11 +109,11 @@ let get_file_mod
     (sess:Session.sess)
     (abi:Abi.abi)
     (filename:filename)
-    (nref:node_id ref)
-    (oref:opaque_id ref)
     : Ast.mod_items =
   let dies = get_dies sess filename in
   let items = Hashtbl.create 0 in
+  let nref = sess.Session.sess_node_id_counter in
+  let oref = sess.Session.sess_opaque_id_counter in
     Dwarf.extract_mod_items nref oref abi items dies;
     items
 ;;
@@ -123,8 +123,6 @@ let get_mod
     (abi:Abi.abi)
     (meta:Ast.meta_pat)
     (use_id:node_id)
-    (nref:node_id ref)
-    (oref:opaque_id ref)
     (crate_item_cache:(crate_id, Ast.mod_items) Hashtbl.t)
     : (filename * Ast.mod_items) =
   let found = Queue.create () in
@@ -215,8 +213,8 @@ let get_mod
       | 1 ->
           let (filename, crate_id) = Queue.pop found in
           let items =
-            htab_search_or_default crate_item_cache crate_id
-              (fun () -> get_file_mod sess abi filename nref oref)
+              htab_search_or_default crate_item_cache crate_id
+                (fun () -> get_file_mod sess abi filename)
           in
             (filename, items)
       | _ -> Common.err (Some use_id) "multiple crates match 'use' clause"
diff --git a/src/boot/driver/main.ml b/src/boot/driver/main.ml
index e80e7682b7e..3bd5d737f33 100644
--- a/src/boot/driver/main.ml
+++ b/src/boot/driver/main.ml
@@ -65,6 +65,9 @@ let (sess:Session.sess) =
     Session.sess_timings = Hashtbl.create 0;
     Session.sess_lib_dirs = Queue.create ();
     Session.sess_crate_meta = Hashtbl.create 0;
+    Session.sess_node_id_counter = ref (Node 0);
+    Session.sess_opaque_id_counter = ref (Opaque 0);
+    Session.sess_temp_id_counter = ref (Temp 0);
   }
 ;;
 
@@ -101,7 +104,7 @@ let set_default_output_filename (sess:Session.sess) : unit =
 
 let dump_sig (filename:filename) : unit =
   let items =
-    Lib.get_file_mod sess abi filename (ref (Node 0)) (ref (Opaque 0)) in
+    Lib.get_file_mod sess abi filename in
     Printf.fprintf stdout "%s\n" (Fmt.fmt_to_str Ast.fmt_mod_items items);
     exit_if_failed ();
     exit 0
diff --git a/src/boot/driver/session.ml b/src/boot/driver/session.ml
index 2f81e4f522a..06fcacb2fda 100644
--- a/src/boot/driver/session.ml
+++ b/src/boot/driver/session.ml
@@ -47,10 +47,15 @@ type sess =
   mutable sess_report_deps: bool;
   mutable sess_next_crate_id: int;
   mutable sess_fuzz_item_count: int;
+
   sess_timings: (string, float) Hashtbl.t;
   sess_spans: (node_id,span) Hashtbl.t;
   sess_lib_dirs: filename Queue.t;
   sess_crate_meta: (meta, crate_id) Hashtbl.t;
+
+  sess_node_id_counter: node_id ref;
+  sess_opaque_id_counter: opaque_id ref;
+  sess_temp_id_counter: temp_id ref;
 }
 ;;
 
diff --git a/src/boot/fe/cexp.ml b/src/boot/fe/cexp.ml
index d856b1310c4..ac05105ea19 100644
--- a/src/boot/fe/cexp.ml
+++ b/src/boot/fe/cexp.ml
@@ -381,9 +381,6 @@ and eval_cexp (env:env) (exp:cexp) : cdir array =
         let ps = env.env_ps in
         let p =
           make_parser
-            ps.pstate_temp_id
-            ps.pstate_node_id
-            ps.pstate_opaque_id
             ps.pstate_crate_cache
             ps.pstate_sess
             ps.pstate_get_mod
@@ -432,12 +429,7 @@ and eval_cexp (env:env) (exp:cexp) : cdir array =
               end
               u.use_meta
           in
-          ps.pstate_get_mod
-            meta_pat
-            id
-            ps.pstate_node_id
-            ps.pstate_opaque_id
-            ps.pstate_crate_cache
+            ps.pstate_get_mod meta_pat id ps.pstate_crate_cache
         in
           iflog ps
             begin
@@ -631,9 +623,6 @@ let parse_crate_file
     (crate_cache:(crate_id, Ast.mod_items) Hashtbl.t)
     : Ast.crate =
   let fname = Session.filename_of sess.Session.sess_in in
-  let tref = ref (Temp 0) in
-  let nref = ref (Node 0) in
-  let oref = ref (Opaque 0) in
   let required = Hashtbl.create 4 in
   let required_syms = Hashtbl.create 4 in
   let files = Hashtbl.create 0 in
@@ -670,7 +659,7 @@ let parse_crate_file
         | Some (PVAL_num n) -> LIT_INT n
   in
   let ps =
-    make_parser tref nref oref crate_cache sess get_mod get_cenv_tok
+    make_parser crate_cache sess get_mod get_cenv_tok
       infer_lib_name required required_syms fname
   in
   let env = { env_bindings = bindings;
@@ -737,9 +726,6 @@ let parse_src_file
     (crate_cache:(crate_id, Ast.mod_items) Hashtbl.t)
     : Ast.crate =
   let fname = Session.filename_of sess.Session.sess_in in
-  let tref = ref (Temp 0) in
-  let nref = ref (Node 0) in
-  let oref = ref (Opaque 0) in
   let required = Hashtbl.create 0 in
   let required_syms = Hashtbl.create 0 in
   let get_cenv_tok ps ident =
@@ -747,7 +733,7 @@ let parse_src_file
                   ident) ps)
   in
   let ps =
-    make_parser tref nref oref crate_cache sess get_mod get_cenv_tok
+    make_parser crate_cache sess get_mod get_cenv_tok
       infer_lib_name required required_syms fname
   in
     with_err_handling sess
diff --git a/src/boot/fe/item.ml b/src/boot/fe/item.ml
index 00eb8387adf..c747713b4c0 100644
--- a/src/boot/fe/item.ml
+++ b/src/boot/fe/item.ml
@@ -1202,14 +1202,7 @@ and parse_use
   let apos = lexpos ps in
   let bpos = lexpos ps in
   let id = (span ps apos bpos ()).id in
-  let (path, items) =
-    ps.pstate_get_mod
-      meta
-      id
-      ps.pstate_node_id
-      ps.pstate_opaque_id
-      ps.pstate_crate_cache
-  in
+  let (path, items) = ps.pstate_get_mod meta id ps.pstate_crate_cache in
   let bpos = lexpos ps in
     expect ps SEMI;
     let rlib =
diff --git a/src/boot/fe/parser.ml b/src/boot/fe/parser.ml
index 883ee01d0ae..3cf464ca7a8 100644
--- a/src/boot/fe/parser.ml
+++ b/src/boot/fe/parser.ml
@@ -6,10 +6,8 @@ open Token;;
 
 type get_mod_fn = (Ast.meta_pat
                    -> node_id
-                     -> (node_id ref)
-                       -> (opaque_id ref)
-                         -> (crate_id, Ast.mod_items) Hashtbl.t
-                           -> (filename * Ast.mod_items))
+                     -> (crate_id, Ast.mod_items) Hashtbl.t
+                       -> (filename * Ast.mod_items))
 ;;
 
 type pstate =
@@ -20,9 +18,6 @@ type pstate =
       pstate_lexbuf       : Lexing.lexbuf;
       pstate_file         : filename;
       pstate_sess         : Session.sess;
-      pstate_temp_id      : temp_id ref;
-      pstate_node_id      : node_id ref;
-      pstate_opaque_id    : opaque_id ref;
       pstate_crate_cache  : (crate_id, Ast.mod_items) Hashtbl.t;
       pstate_get_mod      : get_mod_fn;
       pstate_get_cenv_tok : pstate -> Ast.ident -> token;
@@ -43,9 +38,6 @@ let iflog ps thunk =
 ;;
 
 let make_parser
-    (tref:temp_id ref)
-    (nref:node_id ref)
-    (oref:opaque_id ref)
     (crate_cache:(crate_id, Ast.mod_items) Hashtbl.t)
     (sess:Session.sess)
     (get_mod:get_mod_fn)
@@ -69,9 +61,6 @@ let make_parser
         pstate_lexbuf = lexbuf;
         pstate_file = fname;
         pstate_sess = sess;
-        pstate_temp_id = tref;
-        pstate_node_id = nref;
-        pstate_opaque_id = oref;
         pstate_crate_cache = crate_cache;
         pstate_get_mod = get_mod;
         pstate_get_cenv_tok = get_cenv_tok;
@@ -94,14 +83,16 @@ let lexpos (ps:pstate) : pos =
 ;;
 
 let next_node_id (ps:pstate) : node_id =
-  let id = !(ps.pstate_node_id) in
-    ps.pstate_node_id := Node ((int_of_node id)+1);
+  let r = ps.pstate_sess.Session.sess_node_id_counter in
+  let id = !r in
+    r := Node ((int_of_node id)+1);
     id
 ;;
 
 let next_opaque_id (ps:pstate) : opaque_id =
-  let id = !(ps.pstate_opaque_id) in
-    ps.pstate_opaque_id := Opaque ((int_of_opaque id)+1);
+  let r = ps.pstate_sess.Session.sess_opaque_id_counter in
+  let id = !r in
+    r := Opaque ((int_of_opaque id)+1);
     id
 ;;
 
@@ -203,14 +194,15 @@ let build_tmp
     (apos:pos)
     (bpos:pos)
     : (temp_id * Ast.lval * Ast.stmt) =
-  let nonce = !(ps.pstate_temp_id) in
-    ps.pstate_temp_id := Temp ((int_of_temp nonce)+1);
+  let r = ps.pstate_sess.Session.sess_temp_id_counter in
+  let id = !r in
+    r := Temp ((int_of_temp id)+1);
     iflog ps
-      (fun _ -> log ps "building temporary %d" (int_of_temp nonce));
-    let decl = Ast.DECL_slot (Ast.KEY_temp nonce, (span ps apos bpos slot)) in
+      (fun _ -> log ps "building temporary %d" (int_of_temp id));
+    let decl = Ast.DECL_slot (Ast.KEY_temp id, (span ps apos bpos slot)) in
     let declstmt = span ps apos bpos (Ast.STMT_decl decl) in
-    let tmp = Ast.LVAL_base (span ps apos bpos (Ast.BASE_temp nonce)) in
-      (nonce, tmp, declstmt)
+    let tmp = Ast.LVAL_base (span ps apos bpos (Ast.BASE_temp id)) in
+      (id, tmp, declstmt)
 ;;
 
 (* Simple helpers *)