diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 34c499512..02c47907e 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -29,6 +29,7 @@ dont-merge-to-master:
 .build_binary: &build_binary
   stage: test # To run in sequence and save CPU usage, use stage: build_and_package_binaries
   script:
+    - export COMMIT_DATE="$(git show --no-patch --format=%ci)"
     - $build_binary_script "$target_os_family" "$target_os" "$target_os_version"
     - $package_binary_script "$target_os_family" "$target_os" "$target_os_version"
   artifacts:
diff --git a/gitlab-pages/website/package.json b/gitlab-pages/website/package.json
index 75ac51078..0472bbba8 100644
--- a/gitlab-pages/website/package.json
+++ b/gitlab-pages/website/package.json
@@ -29,7 +29,6 @@
   },
   "dependencies": {
     "@docusaurus/plugin-sitemap": "^2.0.0-alpha.37",
-    "@ligo/syntax": "file:src/@ligo/syntax",
-    "@ligolang/compact-ligo-ide": "^3.0.3"
+    "@ligo/syntax": "file:src/@ligo/syntax"
   }
 }
\ No newline at end of file
diff --git a/gitlab-pages/website/src/theme/CodeBlock/index.js b/gitlab-pages/website/src/theme/CodeBlock/index.js
index f3e30283a..dd0cd92ed 100644
--- a/gitlab-pages/website/src/theme/CodeBlock/index.js
+++ b/gitlab-pages/website/src/theme/CodeBlock/index.js
@@ -8,7 +8,6 @@
 import React, { useEffect, useState, useRef } from 'react';
 import classnames from 'classnames';
 import Highlight, { defaultProps } from 'prism-react-renderer';
-import { CompactLigoIde } from '@ligolang/compact-ligo-ide';
 
 const { Prism } = require("prism-react-renderer");
 
@@ -140,21 +139,6 @@ export default ({ children, className: languageClassName, metastring }) => {
     };
   }, [button.current, target.current]);
 
-  // Compact Ligo IDE support - begin
-  if (languageClassName === 'language-compactLigoIde') {
-    const theme = isDarkTheme ? 'dark' : 'light';
-    const webIdeUrlRegex = /webIdeUrl=(.*)/;
-
-    if (metastring && webIdeUrlRegex.test(metastring)) {
-      const webIdeUrl = metastring.match(webIdeUrlRegex)[1];
-
-      return <CompactLigoIde webIdeUrl={webIdeUrl} theme={theme}>{children}</CompactLigoIde>
-    }
-
-    return <CompactLigoIde theme={theme}>{children}</CompactLigoIde>
-  }
-  // Compact Ligo IDE support -- end
-
   let language =
     languageClassName && languageClassName.replace(/language-/, '');
 
diff --git a/src/bin/expect_tests/contract_tests.ml b/src/bin/expect_tests/contract_tests.ml
index 3e9c0199a..7025aa1a2 100644
--- a/src/bin/expect_tests/contract_tests.ml
+++ b/src/bin/expect_tests/contract_tests.ml
@@ -1425,7 +1425,7 @@ let%expect_test _ =
 let%expect_test _ =
   run_ligo_bad [ "compile-contract" ; bad_contract "redundant_constructors.mligo" ; "main" ] ;
   [%expect {|
-    ligo: redundant constructor:  {"constructor":"Add","environment":"- E[]\tT[union_a -> sum[Add -> int , Remove -> int]]\n- E[]\tT[bool -> sum[false -> unit , true -> unit]]]"}
+    ligo: redundant constructor:  {"constructor":"Add","environment":"- E[]\tT[union_a -> sum[Add -> int , Remove -> int]\nbool -> sum[false -> unit , true -> unit]]"}
 
 
      If you're not sure how to fix this error, you can
@@ -1465,7 +1465,7 @@ ligo: in file "create_contract_var.mligo", line 6, character 35 to line 10, char
 
   run_ligo_bad [ "compile-contract" ; bad_contract "create_contract_no_inline.mligo" ; "main" ] ;
   [%expect {|
-    ligo: in file "create_contract_no_inline.mligo", line 3, characters 40-46. unbound type variable:  {"variable":"return","location":"in file \"create_contract_no_inline.mligo\", line 3, characters 40-46","in":"- E[foo -> int]\tT[] - E[]\tT[bool -> sum[false -> unit , true -> unit]]]","did_you_mean":"no suggestion"}
+    ligo: in file "create_contract_no_inline.mligo", line 3, characters 40-46. unbound type variable:  {"variable":"return","location":"in file \"create_contract_no_inline.mligo\", line 3, characters 40-46","in":"- E[foo -> int]\tT[bool -> sum[false -> unit , true -> unit]]","did_you_mean":"no suggestion"}
 
 
      If you're not sure how to fix this error, you can
diff --git a/src/bin/expect_tests/typer_error_tests.ml b/src/bin/expect_tests/typer_error_tests.ml
index 14162cd5a..1718b83a0 100644
--- a/src/bin/expect_tests/typer_error_tests.ml
+++ b/src/bin/expect_tests/typer_error_tests.ml
@@ -119,7 +119,7 @@ let%expect_test _ =
 
   run_ligo_bad [ "compile-contract" ; "../../test/contracts/negative/error_typer_5.mligo" ; "main" ] ;
   [%expect {|
-    ligo: in file "error_typer_5.mligo", line 1, characters 10-17. unbound type variable:  {"variable":"boolean","location":"in file \"error_typer_5.mligo\", line 1, characters 10-17","in":"- E[]\tT[] - E[]\tT[bool -> sum[false -> unit , true -> unit]]]","did_you_mean":"bool"}
+    ligo: in file "error_typer_5.mligo", line 1, characters 10-17. unbound type variable:  {"variable":"boolean","location":"in file \"error_typer_5.mligo\", line 1, characters 10-17","in":"- E[]\tT[bool -> sum[false -> unit , true -> unit]]","did_you_mean":"bool"}
 
 
      If you're not sure how to fix this error, you can
diff --git a/src/environment/environment.ml b/src/environment/environment.ml
index 523531836..a4fbc6e34 100644
--- a/src/environment/environment.ml
+++ b/src/environment/environment.ml
@@ -1,11 +1 @@
-open Ast_typed
-
-let merge e1 e2 = 
-  let e1 = List.Ne.to_list e1 in
-  let e2 = List.Ne.to_list e2 in
-  List.Ne.of_list @@ e1 @ e2
- 
-
-let default = Environment.full_empty
-
-let default = merge default Bool.environment
+let default = Bool.environment
\ No newline at end of file
diff --git a/src/main/compile/of_core.ml b/src/main/compile/of_core.ml
index c7992399e..6e1eb30b6 100644
--- a/src/main/compile/of_core.ml
+++ b/src/main/compile/of_core.ml
@@ -13,7 +13,7 @@ let compile (cform: form) (program : Ast_core.program) : (Ast_typed.program * As
     | Env -> ok applied in
   ok @@ (applied', state)
 
-let compile_expression ?(env = Ast_typed.Environment.full_empty) ~(state : Ast_typed.typer_state) (e : Ast_core.expression)
+let compile_expression ?(env = Ast_typed.Environment.empty) ~(state : Ast_typed.typer_state) (e : Ast_core.expression)
     : (Ast_typed.expression * Ast_typed.typer_state) result =
   let%bind (ae_typed,state) = Typer.type_expression_subst env state e in
   let () = Typer.Solver.discard_state state in
diff --git a/src/passes/10-transpiler/untranspiler.ml b/src/passes/10-transpiler/untranspiler.ml
index edec0b53f..26e2dd287 100644
--- a/src/passes/10-transpiler/untranspiler.ml
+++ b/src/passes/10-transpiler/untranspiler.ml
@@ -48,13 +48,13 @@ let rec untranspile (v : value) (t : AST.type_expression) : AST.expression resul
         let%bind b =
           trace_strong (wrong_mini_c_value "bool" v) @@
           get_bool v in
-        return (e_bool b Environment.full_empty)
+        return (e_bool b Environment.empty)
       )
   | t when (compare t (t_bool ()).type_content) = 0-> (
         let%bind b =
           trace_strong (wrong_mini_c_value "bool" v) @@
           get_bool v in
-        return (e_bool b Environment.full_empty)
+        return (e_bool b Environment.empty)
       )
   | T_constant type_constant -> (
     match type_constant with
diff --git a/src/passes/8-typer-new/errors.ml b/src/passes/8-typer-new/errors.ml
index 50056d9e4..7446d2f40 100644
--- a/src/passes/8-typer-new/errors.ml
+++ b/src/passes/8-typer-new/errors.ml
@@ -10,7 +10,7 @@ let unbound_type_variable (e:environment) (tv:I.type_variable) (loc:Location.t)
   let data = [
       ("variable" , fun () -> Format.asprintf "%a" I.PP.type_variable tv) ;
       ("location" , fun () -> Format.asprintf "%a" Location.pp loc) ;
-      ("in" , fun () -> Format.asprintf "%a" Environment.PP.full_environment e)
+      ("in" , fun () -> Format.asprintf "%a" Environment.PP.environment e)
     ] in
   error ~data title message ()
 
@@ -20,7 +20,7 @@ let unbound_variable (e:environment) (n:I.expression_variable) (loc:Location.t)
   let message () = "" in
   let data = [
       ("variable" , name) ;
-      ("environment" , fun () -> Format.asprintf "%a" Environment.PP.full_environment e) ;
+      ("environment" , fun () -> Format.asprintf "%a" Environment.PP.environment e) ;
       ("location" , fun () -> Format.asprintf "%a" Location.pp loc)
     ] in
   error ~data title message ()
@@ -60,7 +60,7 @@ let unbound_constructor (e:environment) (c:I.constructor') (loc:Location.t) () =
   let message () = "" in
   let data = [
       ("constructor" , fun () -> Format.asprintf "%a" I.PP.constructor c) ;
-      ("environment" , fun () -> Format.asprintf "%a" Environment.PP.full_environment e) ;
+      ("environment" , fun () -> Format.asprintf "%a" Environment.PP.environment e) ;
       ("location" , fun () -> Format.asprintf "%a" Location.pp loc)
     ] in
   error ~data title message ()
diff --git a/src/passes/8-typer-new/typer.ml b/src/passes/8-typer-new/typer.ml
index f524af386..36fa997fe 100644
--- a/src/passes/8-typer-new/typer.ml
+++ b/src/passes/8-typer-new/typer.ml
@@ -28,7 +28,7 @@ let rec type_declaration env state : I.declaration -> (environment * O.typer_sta
       let%bind (expr , state') =
         trace (constant_declaration_error binder expression tv'_opt) @@
         type_expression env state expression in
-      let post_env = Environment.add_ez_ae binder expr env in
+      let post_env = Environment.add_ez_declaration binder expr env in
       ok (post_env, state' , Some (O.Declaration_constant { binder ; expr ; inline ; post_env} ))
     )
 
@@ -286,7 +286,7 @@ and type_expression : environment -> O.typer_state -> ?tv_opt:O.type_expression
         let content () =
           Format.asprintf "%a in:\n%a\n"
             Stage_common.PP.constructor constructor
-            O.Environment.PP.full_environment e
+            O.Environment.PP.environment e
         in
         error title content in
       trace_option error @@
diff --git a/src/passes/8-typer-old/typer.ml b/src/passes/8-typer-old/typer.ml
index cfe39ee30..85079b11c 100644
--- a/src/passes/8-typer-old/typer.ml
+++ b/src/passes/8-typer-old/typer.ml
@@ -40,7 +40,7 @@ module Errors = struct
     let data = [
       ("variable" , fun () -> Format.asprintf "%a" I.PP.type_variable tv) ;
       ("location" , fun () -> Format.asprintf "%a" Location.pp loc) ;
-      ("in" , fun () -> Format.asprintf "%a" Environment.PP.full_environment e) ;
+      ("in" , fun () -> Format.asprintf "%a" Environment.PP.environment e) ;
       ("did_you_mean" , fun () -> suggestion)
     ] in
     error ~data title message ()
@@ -51,7 +51,7 @@ module Errors = struct
     let message () = "" in
     let data = [
       ("variable" , name) ;
-      ("environment" , fun () -> Format.asprintf "%a" Environment.PP.full_environment e) ;
+      ("environment" , fun () -> Format.asprintf "%a" Environment.PP.environment e) ;
       ("location" , fun () -> Format.asprintf "%a" Location.pp loc)
     ] in
     error ~data title message ()
@@ -91,7 +91,7 @@ module Errors = struct
     let message () = "" in
     let data = [
       ("constructor" , fun () -> Format.asprintf "%a" I.PP.constructor c);
-      ("environment" , fun () -> Format.asprintf "%a" Environment.PP.full_environment e) ;
+      ("environment" , fun () -> Format.asprintf "%a" Environment.PP.environment e) ;
       ("location" , fun () -> Format.asprintf "%a" Location.pp loc)
     ] in
     error ~data title message ()
@@ -101,7 +101,7 @@ module Errors = struct
     let message () = "" in
     let data = [
       ("constructor" , fun () -> Format.asprintf "%a" I.PP.constructor c);
-      ("environment" , fun () -> Format.asprintf "%a" Environment.PP.full_environment e) ;
+      ("environment" , fun () -> Format.asprintf "%a" Environment.PP.environment e) ;
     ] in
     error ~data title message ()
   
@@ -514,7 +514,7 @@ and type_declaration env (_placeholder_for_state_of_new_typer : O.typer_state) :
       let%bind expr =
         trace (constant_declaration_error binder expression tv'_opt) @@
         type_expression' ?tv_opt:tv'_opt env expression in
-      let post_env = Environment.add_ez_ae binder expr env in
+      let post_env = Environment.add_ez_declaration binder expr env in
       ok (post_env, (Solver.placeholder_for_state_of_new_typer ()) , Some (O.Declaration_constant { binder ; expr ; inline ; post_env}))
     )
 
@@ -766,7 +766,7 @@ and type_expression' : environment -> ?tv_opt:O.type_expression -> I.expression
           let content () =
             Format.asprintf "%a in:\n%a\n"
               Stage_common.PP.constructor constructor 
-              O.Environment.PP.full_environment e
+              O.Environment.PP.environment e
           in
           error title content in
         trace_option error @@
diff --git a/src/passes/9-self_ast_typed/michelson_layout.ml b/src/passes/9-self_ast_typed/michelson_layout.ml
index cd6af6142..2211715b9 100644
--- a/src/passes/9-self_ast_typed/michelson_layout.ml
+++ b/src/passes/9-self_ast_typed/michelson_layout.ml
@@ -25,7 +25,7 @@ let match_var (t:type_expression) =
   { expression_content = E_variable (Var.of_name "x") ;
     location = Location.generated ;
     type_expression = t ;
-    environment = Environment.add_ez_binder (Var.of_name "x") t Environment.full_empty}
+    environment = Environment.add_ez_binder (Var.of_name "x") t Environment.empty}
 
 let matching (e:expression) matchee cases =
   { expression_content = E_matching {matchee ; cases};
diff --git a/src/stages/1-ast_imperative/types.ml b/src/stages/1-ast_imperative/types.ml
index baaefc48a..4651c1f9f 100644
--- a/src/stages/1-ast_imperative/types.ml
+++ b/src/stages/1-ast_imperative/types.ml
@@ -189,17 +189,15 @@ and free_variables = expression_variable list
 
 and environment_element =
   { type_value: type_expression
-  ; source_environment: full_environment
+  ; source_environment: environment
   ; definition: environment_element_definition }
 
-and environment = (expression_variable * environment_element) list
+and expr_environment = (expression_variable * environment_element) list
 
 and type_environment = (type_variable * type_expression) list
 
 (* SUBST ??? *)
-and small_environment = environment * type_environment
-
-and full_environment = small_environment List.Ne.t
+and environment = expr_environment * type_environment
 
 and expr = expression
 
diff --git a/src/stages/2-ast_sugar/types.ml b/src/stages/2-ast_sugar/types.ml
index 566f8ec35..88df116fb 100644
--- a/src/stages/2-ast_sugar/types.ml
+++ b/src/stages/2-ast_sugar/types.ml
@@ -147,17 +147,15 @@ and free_variables = expression_variable list
 
 and environment_element =
   { type_value: type_expression
-  ; source_environment: full_environment
+  ; source_environment: environment
   ; definition: environment_element_definition }
 
-and environment = (expression_variable * environment_element) list
+and expr_environment = (expression_variable * environment_element) list
 
 and type_environment = (type_variable * type_expression) list
 
 (* SUBST ??? *)
-and small_environment = environment * type_environment
-
-and full_environment = small_environment List.Ne.t
+and environment = expr_environment * type_environment
 
 and expr = expression
 
diff --git a/src/stages/3-ast_core/types.ml b/src/stages/3-ast_core/types.ml
index e925c5f3b..2a76591df 100644
--- a/src/stages/3-ast_core/types.ml
+++ b/src/stages/3-ast_core/types.ml
@@ -92,17 +92,15 @@ and free_variables = expression_variable list
 
 and environment_element =
   { type_value: type_expression
-  ; source_environment: full_environment
+  ; source_environment: environment
   ; definition: environment_element_definition }
 
-and environment = (expression_variable * environment_element) list
+and expr_environment = (expression_variable * environment_element) list
 
 and type_environment = (type_variable * type_expression) list
 
 (* SUBST ??? *)
-and small_environment = environment * type_environment
-
-and full_environment = small_environment List.Ne.t
+and environment = expr_environment * type_environment
 
 and expr = expression
 
diff --git a/src/stages/4-ast_typed/PP_generic.ml b/src/stages/4-ast_typed/PP_generic.ml
index d28e164ee..b2a2bf179 100644
--- a/src/stages/4-ast_typed/PP_generic.ml
+++ b/src/stages/4-ast_typed/PP_generic.ml
@@ -27,7 +27,6 @@ let needs_parens              = {
     label_map                 = (fun _ _ _ _ -> false) ;
     list                      = (fun _ _ _ _ -> false) ;
     location_wrap             = (fun _ _ _ _ -> false) ;
-    list_ne                   = (fun _ _ _ _ -> false) ;
     option                    = (fun _visitor _continue _state o ->
       match o with None -> false | Some _ -> true) ;
     poly_unionfind            = (fun _ _ _ _ -> false) ;
@@ -80,10 +79,10 @@ let op ppf = {
     location_wrap             = (fun _visitor continue () lwrap  ->
       let ({ wrap_content; location } : _ Location.wrap) = lwrap in
       fprintf ppf "{ wrap_content = %a ; location = %a }" (fun _ppf -> continue ()) wrap_content Location.pp location);
-    list_ne = (fun _visitor continue () (first, lst) ->
+    (* list_ne = (fun _visitor continue () (first, lst) ->
       let aux ppf elt =
         fprintf ppf "%a" (fun _ppf -> continue ()) elt in
-      fprintf ppf "[@,@[<hv 2> %a @]@,]" (list_sep aux (fun ppf () -> fprintf ppf " ;@ ")) (first::lst));
+      fprintf ppf "[@,@[<hv 2> %a @]@,]" (list_sep aux (fun ppf () -> fprintf ppf " ;@ ")) (first::lst)); *)
     option = (fun _visitor continue () o ->
       match o with
       | None -> fprintf ppf "None"
diff --git a/src/stages/4-ast_typed/combinators.mli b/src/stages/4-ast_typed/combinators.mli
index 485dc6185..e3ce6a156 100644
--- a/src/stages/4-ast_typed/combinators.mli
+++ b/src/stages/4-ast_typed/combinators.mli
@@ -3,7 +3,7 @@ open Types
 
 val make_n_t : type_variable -> type_expression -> named_type_content
 val make_t : ?loc:Location.t -> type_content -> S.type_expression option -> type_expression
-val make_e : ?location:Location.t -> expression_content -> type_expression -> full_environment -> expression
+val make_e : ?location:Location.t -> expression_content -> type_expression -> environment -> expression
 
 val t_bool : ?loc:Location.t -> ?s:S.type_expression -> unit -> type_expression
 val t_string : ?loc:Location.t -> ?s:S.type_expression -> unit -> type_expression
@@ -38,7 +38,7 @@ val t_function : type_expression -> type_expression -> ?loc:Location.t -> ?s:S.t
 val t_shallow_closure : type_expression -> type_expression -> ?loc:Location.t -> ?s:S.type_expression -> unit -> type_expression
 val get_type_expression : expression -> type_expression
 val get_type' : type_expression -> type_content
-val get_environment : expression -> full_environment
+val get_environment : expression -> environment
 val get_expression : expression -> expression_content
 val get_lambda : expression -> lambda result
 val get_lambda_with_type : expression -> (lambda * ( type_expression * type_expression) ) result
@@ -115,7 +115,7 @@ val e_unit : unit -> expression_content
 val e_int : Z.t -> expression_content
 val e_nat : Z.t -> expression_content
 val e_mutez : Z.t -> expression_content
-val e_bool : bool -> full_environment -> expression_content
+val e_bool : bool -> environment -> expression_content
 val e_string : string -> expression_content
 val e_bytes : bytes -> expression_content
 val e_timestamp : Z.t -> expression_content
@@ -131,22 +131,22 @@ val e_application : expression -> expression -> expression_content
 val e_variable : expression_variable -> expression_content
 val e_let_in : expression_variable -> inline -> expression -> expression -> expression_content
 
-val e_a_unit : full_environment -> expression
-val e_a_int : Z.t -> full_environment -> expression
-val e_a_nat : Z.t -> full_environment -> expression
-val e_a_mutez : Z.t -> full_environment -> expression
-val e_a_bool : bool -> full_environment -> expression
-val e_a_string : string -> full_environment -> expression
-val e_a_address : string -> full_environment -> expression
-val e_a_pair : expression -> expression -> full_environment -> expression
-val e_a_some : expression -> full_environment -> expression
-val e_a_lambda : lambda -> type_expression -> type_expression -> full_environment -> expression
-val e_a_none : type_expression -> full_environment -> expression
-val e_a_record : expression label_map -> full_environment -> expression
-val e_a_application : expression -> expression -> full_environment -> expression
-val e_a_variable : expression_variable -> type_expression -> full_environment -> expression
-val ez_e_a_record : ( label * expression ) list -> full_environment -> expression
-val e_a_let_in : expression_variable -> bool -> expression -> expression -> full_environment -> expression
+val e_a_unit : environment -> expression
+val e_a_int : Z.t -> environment -> expression
+val e_a_nat : Z.t -> environment -> expression
+val e_a_mutez : Z.t -> environment -> expression
+val e_a_bool : bool -> environment -> expression
+val e_a_string : string -> environment -> expression
+val e_a_address : string -> environment -> expression
+val e_a_pair : expression -> expression -> environment -> expression
+val e_a_some : expression -> environment -> expression
+val e_a_lambda : lambda -> type_expression -> type_expression -> environment -> expression
+val e_a_none : type_expression -> environment -> expression
+val e_a_record : expression label_map -> environment -> expression
+val e_a_application : expression -> expression -> environment -> expression
+val e_a_variable : expression_variable -> type_expression -> environment -> expression
+val ez_e_a_record : ( label * expression ) list -> environment -> expression
+val e_a_let_in : expression_variable -> bool -> expression -> expression -> environment -> expression
 
 val get_a_int : expression -> Z.t result
 val get_a_unit : expression -> unit result
diff --git a/src/stages/4-ast_typed/combinators_environment.ml b/src/stages/4-ast_typed/combinators_environment.ml
index 5fcb358fa..78e11ad9a 100644
--- a/src/stages/4-ast_typed/combinators_environment.ml
+++ b/src/stages/4-ast_typed/combinators_environment.ml
@@ -1,25 +1,25 @@
 open Types
 open Combinators
 
-let make_a_e_empty expression type_annotation = make_e expression type_annotation Environment.full_empty
+let make_a_e_empty expression type_annotation = make_e expression type_annotation Environment.empty
 
-let e_a_empty_unit = e_a_unit Environment.full_empty
-let e_a_empty_int n = e_a_int n Environment.full_empty
-let e_a_empty_nat n = e_a_nat n Environment.full_empty
-let e_a_empty_mutez n = e_a_mutez n Environment.full_empty
-let e_a_empty_bool b = e_a_bool b Environment.full_empty
-let e_a_empty_string s = e_a_string s Environment.full_empty
-let e_a_empty_address s = e_a_address s Environment.full_empty
-let e_a_empty_pair a b = e_a_pair a b Environment.full_empty
-let e_a_empty_some s = e_a_some s Environment.full_empty
-let e_a_empty_none t = e_a_none t Environment.full_empty
-let e_a_empty_record r = e_a_record r Environment.full_empty
-let ez_e_a_empty_record r = ez_e_a_record r Environment.full_empty
-let e_a_empty_lambda l i o = e_a_lambda l i o Environment.full_empty
+let e_a_empty_unit = e_a_unit Environment.empty
+let e_a_empty_int n = e_a_int n Environment.empty
+let e_a_empty_nat n = e_a_nat n Environment.empty
+let e_a_empty_mutez n = e_a_mutez n Environment.empty
+let e_a_empty_bool b = e_a_bool b Environment.empty
+let e_a_empty_string s = e_a_string s Environment.empty
+let e_a_empty_address s = e_a_address s Environment.empty
+let e_a_empty_pair a b = e_a_pair a b Environment.empty
+let e_a_empty_some s = e_a_some s Environment.empty
+let e_a_empty_none t = e_a_none t Environment.empty
+let e_a_empty_record r = e_a_record r Environment.empty
+let ez_e_a_empty_record r = ez_e_a_record r Environment.empty
+let e_a_empty_lambda l i o = e_a_lambda l i o Environment.empty
 
 open Environment
 
-let env_sum_type ?(env = full_empty)
+let env_sum_type ?(env = empty)
     ?(type_name = Var.of_name "a_sum_type")
     (lst : (constructor' * ctor_content) list) =
   add_type type_name (make_t_ez_sum lst) env
diff --git a/src/stages/4-ast_typed/combinators_environment.mli b/src/stages/4-ast_typed/combinators_environment.mli
index 55c345b47..861d67083 100644
--- a/src/stages/4-ast_typed/combinators_environment.mli
+++ b/src/stages/4-ast_typed/combinators_environment.mli
@@ -16,4 +16,4 @@ val e_a_empty_record : expression label_map -> expression
 val ez_e_a_empty_record : ( label * expression ) list -> expression
 val e_a_empty_lambda : lambda -> type_expression -> type_expression -> expression
 
-val env_sum_type : ?env:full_environment -> ?type_name:type_variable -> (constructor' * ctor_content) list ->  full_environment
+val env_sum_type : ?env:environment -> ?type_name:type_variable -> (constructor' * ctor_content) list ->  environment
diff --git a/src/stages/4-ast_typed/environment.ml b/src/stages/4-ast_typed/environment.ml
index d1bc6dc73..30e59ebab 100644
--- a/src/stages/4-ast_typed/environment.ml
+++ b/src/stages/4-ast_typed/environment.ml
@@ -1,52 +1,46 @@
 open Types
 open Combinators
 
+type t = environment
 type element = environment_element
-let make_element : type_expression -> full_environment -> environment_element_definition -> element =
+
+let make_element : type_expression -> environment -> environment_element_definition -> element =
   fun type_value source_environment definition -> {type_value ; source_environment ; definition}
 
 let make_element_binder = fun t s -> make_element t s ED_binder
+
 let make_element_declaration = fun s (expr : expression) ->
   let free_variables = Misc.Free_variables.(expression empty expr) in
   make_element (get_type_expression expr) s (ED_declaration {expr ; free_variables})
 
-module Small = struct
-  type t = small_environment
+let empty : t = { expression_environment = [] ; type_environment = [] }
 
-  let empty : t = { expression_environment = [] ; type_environment = [] }
+let get_expr_environment : t -> expression_environment = fun { expression_environment ; type_environment=_ } -> expression_environment
+(* TODO: generate *)
+let get_type_environment : t -> type_environment = fun { expression_environment=_ ; type_environment } -> type_environment
+(* TODO: generate *)
+let map_expr_environment : _ -> t -> t = fun f { expression_environment ; type_environment } -> { expression_environment = f expression_environment ; type_environment }
+let map_type_environment : _ -> t -> t = fun f { expression_environment ; type_environment } -> { expression_environment ; type_environment = f type_environment }
 
-  (* TODO: generate *)
-  let get_environment : t -> environment = fun { expression_environment ; type_environment=_ } -> expression_environment
-  (* TODO: generate *)
-  let get_type_environment : t -> type_environment = fun { expression_environment=_ ; type_environment } -> type_environment
-  (* TODO: generate *)
-  let map_environment : _ -> t -> t = fun f { expression_environment ; type_environment } -> { expression_environment = f expression_environment ; type_environment }
-  let map_type_environment : _ -> t -> t = fun f { expression_environment ; type_environment } -> { expression_environment ; type_environment = f type_environment }
+let add_expr : expression_variable -> element -> t -> t = fun expr_var env_elt -> map_expr_environment (fun x -> {expr_var ; env_elt} :: x)
+let add_type : type_variable -> type_expression -> t -> t = fun type_variable type_ -> map_type_environment (fun x -> { type_variable ; type_ } :: x)
+(* TODO: generate : these are now messy, clean them up. *)
+let get_opt : expression_variable -> t -> element option = fun k x ->
+  Option.bind (fun {expr_var=_ ; env_elt} -> Some env_elt) @@
+    List.find_opt (fun {expr_var ; env_elt=_} -> Var.equal expr_var k) (get_expr_environment x)
+let get_type_opt : type_variable -> t -> type_expression option = fun k x ->
+  Option.bind (fun {type_variable=_ ; type_} -> Some type_) @@
+    List.find_opt (fun {type_variable ; type_=_} -> Var.equal type_variable k) (get_type_environment x)
 
-  let add : expression_variable -> element -> t -> t = fun expr_var env_elt -> map_environment (fun x -> {expr_var ; env_elt} :: x)
-  let add_type : type_variable -> type_expression -> t -> t = fun type_variable type_ -> map_type_environment (fun x -> { type_variable ; type_ } :: x)
-  (* TODO: generate : these are now messy, clean them up. *)
-  let get_opt : expression_variable -> t -> element option = fun k x -> Option.bind (fun {expr_var=_ ; env_elt} -> Some env_elt) @@ List.find_opt (fun {expr_var ; env_elt=_} -> Var.equal expr_var k) (get_environment x)
-  let get_type_opt : type_variable -> t -> type_expression option = fun k x -> Option.bind (fun {type_variable=_ ; type_} -> Some type_) @@ List.find_opt (fun {type_variable ; type_=_} -> Var.equal type_variable k) (get_type_environment x)
-end
-
-type t = full_environment
-let empty : environment = Small.(get_environment empty)
-let full_empty : t = List.Ne.singleton Small.empty
-let add : expression_variable -> element -> t -> t = fun k v -> List.Ne.hd_map (Small.add k v)
 let add_ez_binder : expression_variable -> type_expression -> t -> t = fun k v e ->
-  List.Ne.hd_map (Small.add k (make_element_binder v e)) e
+  add_expr k (make_element_binder v e) e
+
 let add_ez_declaration : expression_variable -> expression -> t -> t = fun k ae e ->
-  List.Ne.hd_map (Small.add k (make_element_declaration e ae)) e
-let add_ez_ae = add_ez_declaration
-let add_type : type_variable -> type_expression -> t -> t = fun k v -> List.Ne.hd_map (Small.add_type k v)
-let get_opt : expression_variable -> t -> element option = fun k x -> List.Ne.find_map (Small.get_opt k) x
-let get_type_opt : type_variable -> t -> type_expression option = fun k x -> List.Ne.find_map (Small.get_type_opt k) x
+  add_expr k (make_element_declaration e ae) e
 
 let convert_constructor' (S.Constructor c) = Constructor c
 
 let get_constructor : Ast_core.constructor' -> t -> (type_expression * type_expression) option = fun k x -> (* Left is the constructor, right is the sum type *)
-  let aux = fun x ->
     let aux = fun {type_variable=_ ; type_} ->
       match type_.type_content with
       | T_sum m ->
@@ -55,8 +49,7 @@ let get_constructor : Ast_core.constructor' -> t -> (type_expression * type_expr
          | None -> None)
       | _ -> None
     in
-    List.find_map aux (Small.get_type_environment x) in
-  List.Ne.find_map aux x
+    List.find_map aux (get_type_environment x)
 
 
 module PP = struct
@@ -72,27 +65,15 @@ module PP = struct
   let type_environment_element = fun ppf {type_variable ; type_} ->
     fprintf ppf "%a -> %a" PP.type_variable type_variable PP.type_expression type_
 
-  let environment : _ -> environment -> unit = fun ppf lst ->
-    fprintf ppf "E[%a]" (list_sep environment_element (const " , ")) lst
+  let expr_environment : _ -> expression_environment -> unit = fun ppf lst ->
+    fprintf ppf "E[%a]" (list_sep environment_element (tag "@,")) lst
 
   let type_environment = fun ppf lst ->
-    fprintf ppf "T[%a]" (list_sep type_environment_element (const " , ")) lst
+    fprintf ppf "T[%a]" (list_sep type_environment_element (tag "@,")) lst
 
-  let small_environment : _ -> small_environment -> unit = fun ppf e ->
+  let environment : _ -> environment -> unit = fun ppf e ->
     fprintf ppf "- %a\t%a"
-      environment (Small.get_environment e)
-      type_environment (Small.get_type_environment e)
+      expr_environment (get_expr_environment e)
+      type_environment (get_type_environment e)
 
-  let full_environment : _ -> full_environment -> unit = fun ppf e ->
-    fprintf ppf "@[%a]"
-      (ne_list_sep small_environment (tag "@;")) e
-end
-
-open Trace
-
-let get_trace : expression_variable -> t -> element result = fun s env ->
-  let error =
-    let title () = "missing var not in env" in
-    let content () = Format.asprintf "\nvar: %a\nenv: %a\n" PP. expression_variable s PP.full_environment env in
-    error title content in
-  trace_option error @@ get_opt s env
+end
\ No newline at end of file
diff --git a/src/stages/4-ast_typed/environment.mli b/src/stages/4-ast_typed/environment.mli
index 657552937..6b3fb52e2 100644
--- a/src/stages/4-ast_typed/environment.mli
+++ b/src/stages/4-ast_typed/environment.mli
@@ -1,62 +1,20 @@
 open Types
-open Trace
 
-type t = full_environment
+type t = environment
 type element = environment_element
 
-val get_trace : expression_variable -> t -> element result
-val empty : environment
-val full_empty : t
-val add : expression_variable -> element -> t -> t
+val empty : t
 val add_ez_binder : expression_variable -> type_expression -> t -> t
 val add_ez_declaration : expression_variable -> expression -> t -> t
-val add_ez_ae : expression_variable -> expression -> t -> t
 val add_type : type_variable -> type_expression -> t -> t
 val get_opt : expression_variable -> t -> element option
 val get_type_opt : type_variable -> t -> type_expression option
 val get_constructor : Ast_core.constructor' -> t -> (type_expression * type_expression) option
 
-module Small : sig
-  type t = small_environment
-  val get_environment : t -> environment
-(*
-
-  val empty : t
-
-  val get_type_environment : t -> type_environment
-  val map_environment : ( environment -> environment ) -> t -> t
-  val map_type_environment : ( type_environment -> type_environment ) -> t -> t
-
-  val add : string -> element -> t -> t
-  val add_type : string -> type_expression -> t -> t
-  val get_opt : string -> t -> element option
-  val get_type_opt : string -> t -> type_expression option
-  *)
-end
-(*
-
-val make_element : type_expression -> full_environment -> environment_element_definition -> element
-val make_element_binder : type_expression -> full_environment -> element
-val make_element_declaration : full_environment -> expression -> element
-*)
-
-
-
 module PP : sig
   open Format
 
   val list_sep_scope : (formatter -> 'a -> unit) -> formatter -> 'a list -> unit
-  val full_environment : formatter -> full_environment -> unit 
-(*
-  val environment_element : formatter -> ( string * environment_element ) -> unit
+  val environment : formatter -> environment -> unit 
 
-  val type_environment_element : formatter -> ( string * type_expression ) -> unit
-
-  val environment : formatter -> environment -> unit
-
-  val type_environment : formatter -> type_environment -> unit
-
-  val small_environment : formatter -> small_environment -> unit
-
-  *)
 end
diff --git a/src/stages/4-ast_typed/misc.ml b/src/stages/4-ast_typed/misc.ml
index a2c5c9b87..a3df9718f 100644
--- a/src/stages/4-ast_typed/misc.ml
+++ b/src/stages/4-ast_typed/misc.ml
@@ -255,7 +255,7 @@ end
  *   let empty : bindings = []
  *   let of_list : string list -> bindings = fun x -> x
  * 
- *   let rec expression : bindings -> full_environment -> expression -> bindings = fun b _env e ->
+ *   let rec expression : bindings -> environment -> expression -> bindings = fun b _env e ->
  *     let self = annotated_expression b in
  *     match e with
  *     | E_lambda l ->
@@ -519,7 +519,7 @@ let get_entry (lst : program) (name : string) : expression result =
   in
   List.find_map aux lst
 
-let program_environment (program : program) : full_environment =
+let program_environment (program : program) : environment =
   let last_declaration = Location.unwrap List.(hd @@ rev program) in
   match last_declaration with
   | Declaration_constant { binder=_ ; expr=_ ; inline=_ ; post_env } -> post_env
diff --git a/src/stages/4-ast_typed/misc.mli b/src/stages/4-ast_typed/misc.mli
index 76727dbdc..ae0bb692f 100644
--- a/src/stages/4-ast_typed/misc.mli
+++ b/src/stages/4-ast_typed/misc.mli
@@ -70,7 +70,7 @@ val assert_literal_eq : ( literal * literal ) -> unit result
 *)
 
 val get_entry : program -> string -> expression result
-val program_environment : program -> full_environment
+val program_environment : program -> environment
 
 val p_constant : constant_tag -> p_ctor_args -> type_value
 val c_equation : type_value -> type_value -> string -> type_constraint
diff --git a/src/stages/4-ast_typed/misc_smart.ml b/src/stages/4-ast_typed/misc_smart.ml
index 679789804..a09ed2acc 100644
--- a/src/stages/4-ast_typed/misc_smart.ml
+++ b/src/stages/4-ast_typed/misc_smart.ml
@@ -24,7 +24,7 @@ let program_to_main : program -> string -> lambda result = fun p s ->
     let aux = fun _ d ->
       match d with
       | Declaration_constant {binder=_ ; expr= _ ; inline=_ ; post_env } -> post_env in
-    List.fold_left aux Environment.full_empty (List.map Location.unwrap p) in
+    List.fold_left aux Environment.empty (List.map Location.unwrap p) in
   let binder = Var.of_name "@contract_input" in
   let result =
     let input_expr = e_a_variable binder input_type env in
@@ -47,7 +47,7 @@ module Captured_variables = struct
 
   let rec expression : bindings -> expression -> bindings result = fun b e ->
     expression_content b e.environment e.expression_content
-  and expression_content : bindings -> full_environment -> expression_content -> bindings result = fun b env ec ->
+  and expression_content : bindings -> environment -> expression_content -> bindings result = fun b env ec ->
     let self = expression b in
     match ec with
     | E_lambda l -> ok @@ Free_variables.lambda empty l
diff --git a/src/stages/4-ast_typed/types.ml b/src/stages/4-ast_typed/types.ml
index 047988907..195efe054 100644
--- a/src/stages/4-ast_typed/types.ml
+++ b/src/stages/4-ast_typed/types.ml
@@ -269,7 +269,7 @@ and declaration_constant = {
     binder : expression_variable ;
     expr : expression ;
     inline : bool ;
-    post_env : full_environment ;
+    post_env : environment ;
   }
 
 and declaration =
@@ -281,7 +281,7 @@ and declaration =
   | Declaration_constant of declaration_constant
   (*
   | Declaration_type of (type_variable * type_expression)
-  | Declaration_constant of (named_expression * (full_environment * full_environment))
+  | Declaration_constant of (named_expression * (environment * environment))
   *)
 (* | Macro_declaration of macro_declaration *)
 
@@ -289,7 +289,7 @@ and expression = {
     expression_content: expression_content ;
     location: location ;
     type_expression: type_expression ;
-    environment: full_environment ;
+    environment: environment ;
   }
 
 and map_kv = {
@@ -392,11 +392,11 @@ and free_variables = expression_variable list
 
 and environment_element = {
     type_value: type_expression ;
-    source_environment: full_environment ;
+    source_environment: environment ;
     definition: environment_element_definition ;
   }
 
-and environment = environment_binding list
+and expression_environment = environment_binding list
 
 and environment_binding = {
     expr_var: expression_variable ;
@@ -410,14 +410,11 @@ and type_environment_binding = {
     type_: type_expression ;
 }
 
-(* SUBST ??? *)
-and small_environment = {
-  expression_environment: environment ;
+and environment = {
+  expression_environment: expression_environment ;
   type_environment: type_environment ;
 }
 
-and full_environment = small_environment list_ne
-
 and named_type_content = {
     type_name : type_variable;
     type_value : type_expression;
diff --git a/src/stages/typesystem/misc.ml b/src/stages/typesystem/misc.ml
index cbb90084d..d7662698a 100644
--- a/src/stages/typesystem/misc.ml
+++ b/src/stages/typesystem/misc.ml
@@ -21,10 +21,10 @@ module Substitution = struct
         let%bind expr = s_expression ~substs expr in
         let%bind free_variables = bind_map_list (s_variable ~substs) free_variables in
         ok @@ T.ED_declaration {expr ; free_variables}
-    and s_environment : T.environment w = fun ~substs env ->
+    and s_expr_environment : T.expression_environment w = fun ~substs env ->
       bind_map_list (fun T.{expr_var=variable ; env_elt={ type_value; source_environment; definition }} ->
           let%bind type_value = s_type_expression ~substs type_value in
-          let%bind source_environment = s_full_environment ~substs source_environment in
+          let%bind source_environment = s_environment ~substs source_environment in
           let%bind definition = s_environment_element_definition ~substs definition in
           ok @@ T.{expr_var=variable ; env_elt={ type_value; source_environment; definition }}) env
     and s_type_environment : T.type_environment w = fun ~substs tenv ->
@@ -32,14 +32,14 @@ module Substitution = struct
         let%bind type_variable = s_type_variable ~substs type_variable in
         let%bind type_ = s_type_expression ~substs type_ in
         ok @@ T.{type_variable ; type_}) tenv
-    and s_small_environment : T.small_environment w = fun ~substs T.{expression_environment ; type_environment} ->
-      let%bind expression_environment = s_environment ~substs expression_environment in
+    and s_environment : T.environment w = fun ~substs T.{expression_environment ; type_environment} ->
+      let%bind expression_environment = s_expr_environment ~substs expression_environment in
       let%bind type_environment = s_type_environment ~substs type_environment in
       ok @@ T.{ expression_environment ; type_environment }
-    and s_full_environment : T.full_environment w = fun ~substs (a , b) ->
-      let%bind a = s_small_environment ~substs a in
-      let%bind b = bind_map_list (s_small_environment ~substs) b in
-      ok (a , b)
+    (* and s_environment : T.environment w = fun ~substs (a , b) ->
+      let%bind a = s_environment ~substs a in
+      let%bind b = bind_map_list (s_environment ~substs) b in
+      ok (a , b) *)
 
     and s_variable : T.expression_variable w = fun ~substs var ->
       let () = ignore @@ substs in
@@ -198,7 +198,7 @@ module Substitution = struct
     and s_expression : T.expression w = fun ~(substs:substs) { expression_content; type_expression; environment; location } ->
       let%bind expression_content = s_expression_content ~substs expression_content in
       let%bind type_expr = s_type_expression ~substs type_expression in
-      let%bind environment = s_full_environment ~substs environment in
+      let%bind environment = s_environment ~substs environment in
       let location = location in
       ok T.{ expression_content;type_expression=type_expr; environment; location }
 
@@ -207,7 +207,7 @@ module Substitution = struct
         Ast_typed.Declaration_constant {binder ; expr ; inline ; post_env} ->
         let%bind binder = s_variable ~substs binder in
         let%bind expr = s_expression ~substs expr in
-        let%bind post_env = s_full_environment ~substs post_env in
+        let%bind post_env = s_environment ~substs post_env in
         ok @@ Ast_typed.Declaration_constant {binder; expr; inline; post_env}
 
     and s_declaration_wrap :T.declaration Location.wrap w = fun ~substs d ->
diff --git a/src/test/typer_tests.ml b/src/test/typer_tests.ml
index 7c22aa842..92df6e911 100644
--- a/src/test/typer_tests.ml
+++ b/src/test/typer_tests.ml
@@ -10,7 +10,7 @@ let int () : unit result =
   let open Combinators in
   let pre = e_int (Z.of_int 32) in
   let open Typer in
-  let e = Environment.full_empty in
+  let e = Environment.empty in
   let state = Typer.Solver.initial_state in
   let%bind (post , new_state) = type_expression_subst e state pre in
   let () = Typer.Solver.discard_state new_state in