diff --git a/AUTHORS.adoc b/AUTHORS.adoc
index c4772003..b1ee4699 100644
--- a/AUTHORS.adoc
+++ b/AUTHORS.adoc
@@ -12,3 +12,4 @@
 - Emmanuel Surleau (emm)
 - Guillaume Bury (guigui)
 - JP Rodi
+- octachron (Florian Angeletti)
diff --git a/CHANGELOG.adoc b/CHANGELOG.adoc
index 43e557f2..e2ec92c3 100644
--- a/CHANGELOG.adoc
+++ b/CHANGELOG.adoc
@@ -1,5 +1,28 @@
 = Changelog
 
+== 0.15
+
+=== breaking changes
+
+- remove deprecated `CCFloat.sign`
+- remove deprecated `CCSexpStream`
+
+=== other changes
+
+- basic color handling in `CCFormat`, using tags and ANSI codes
+- add `CCVector.ro_vector` as a convenience alias
+- add `CCOrd.option`
+- add `CCMap.{keys,values}`
+- add wip `CCAllocCache`, an allocation cache for short-lived arrays
+- add `CCError.{join,both}` applicative functions for CCError
+- opam: depend on ocamlbuild
+- work on `CCRandom` by octachron:
+  * add an uniformity test
+  * Make `split_list` uniform
+  * Add sample_without_replacement
+
+- bugfix: forgot to export `{Set.Map}.OrderedType` in `Containers`
+
 == 0.14
 
 === breaking changes
@@ -13,7 +36,7 @@
 - deprecate `CCVector.rev'`, renamed into `CCVector.rev_in_place`
 - deprecate `CCVector.flat_map'`, renamed `flat_map_seq`
 
-- add `CCMap.add_{list,seq}`
+- add `CCMap.add_{list,seqe`
 - add `CCSet.add_{list,seq}`
 - fix small uglyness in `Map.print` and `Set.print`
 - add `CCFormat.{ksprintf,string_quoted}`
diff --git a/Makefile b/Makefile
index 66d1cb5e..35270e8a 100644
--- a/Makefile
+++ b/Makefile
@@ -124,7 +124,7 @@ devel:
 	make all
 
 watch:
-	while find src/ -print0 | xargs -0 inotifywait -e delete_self -e modify ; do \
+	while find src/ benchs/ -print0 | xargs -0 inotifywait -e delete_self -e modify ; do \
 		echo "============ at `date` ==========" ; \
 		make ; \
 	done
diff --git a/_oasis b/_oasis
index 0aa8b651..0fd3144b 100644
--- a/_oasis
+++ b/_oasis
@@ -1,6 +1,6 @@
 OASISFormat: 0.4
 Name:        containers
-Version:     0.14
+Version:     0.15
 Homepage:    https://github.com/c-cube/ocaml-containers
 Authors:     Simon Cruanes
 License:     BSD-2-clause
@@ -66,7 +66,7 @@ Library "containers_unix"
 
 Library "containers_sexp"
   Path:             src/sexp
-  Modules:          CCSexp, CCSexpStream, CCSexpM
+  Modules:          CCSexp, CCSexpM
   BuildDepends:     bytes
   FindlibParent:    containers
   FindlibName:      sexp
@@ -77,7 +77,7 @@ Library "containers_data"
                     CCPersistentHashtbl, CCDeque, CCFQueue, CCBV, CCMixtbl,
                     CCMixmap, CCRingBuffer, CCIntMap, CCPersistentArray,
                     CCMixset, CCHashconsedSet, CCGraph, CCHashSet, CCBitField,
-                    CCHashTrie, CCBloom, CCWBTree, CCRAL
+                    CCHashTrie, CCBloom, CCWBTree, CCRAL, CCAllocCache
   BuildDepends:     bytes
   # BuildDepends:     bytes, bisect_ppx
   FindlibParent:    containers
@@ -182,13 +182,6 @@ Test all
   TestTools:    run_qtest
   Run$:         flag(tests) && flag(unix) && flag(advanced) && flag(bigarray)
 
-Executable id_sexp
-  Path:             examples/
-  Install:          false
-  CompiledObject:   best
-  MainIs:           id_sexp.ml
-  BuildDepends:     containers.sexp
-
 Executable mem_measure
   Path:             benchs/
   Install:          false
@@ -197,11 +190,11 @@ Executable mem_measure
   Build$:           flag(bench)
   BuildDepends:     sequence, unix, containers, containers.data, hamt
 
-Executable id_sexp2
+Executable id_sexp
   Path:             examples/
   Install:          false
   CompiledObject:   best
-  MainIs:           id_sexp2.ml
+  MainIs:           id_sexp.ml
   BuildDepends:     containers.sexp
 
 SourceRepository head
diff --git a/_tags b/_tags
index 805fc84c..5f9aea26 100644
--- a/_tags
+++ b/_tags
@@ -1,5 +1,5 @@
 # OASIS_START
-# DO NOT EDIT (digest: 0e7b7eeffb179d552ac9c060b7ab3be9)
+# DO NOT EDIT (digest: 1dc452faf114e2c3c507c622ca14c960)
 # Ignore VCS directories, you can use the same kind of rule outside
 # OASIS_START/STOP if you want to exclude directories that contains
 # useless stuff for the build process
@@ -123,9 +123,6 @@ true: annot, bin_annot
 <qtest/*.ml{,i,y}>: use_containers_string
 <qtest/*.ml{,i,y}>: use_containers_thread
 <qtest/*.ml{,i,y}>: use_containers_unix
-# Executable id_sexp
-<examples/id_sexp.{native,byte}>: package(bytes)
-<examples/id_sexp.{native,byte}>: use_containers_sexp
 # Executable mem_measure
 "benchs/mem_measure.native": package(bytes)
 "benchs/mem_measure.native": package(hamt)
@@ -139,9 +136,9 @@ true: annot, bin_annot
 <benchs/*.ml{,i,y}>: package(unix)
 <benchs/*.ml{,i,y}>: use_containers
 <benchs/*.ml{,i,y}>: use_containers_data
-# Executable id_sexp2
-<examples/id_sexp2.{native,byte}>: package(bytes)
-<examples/id_sexp2.{native,byte}>: use_containers_sexp
+# Executable id_sexp
+<examples/id_sexp.{native,byte}>: package(bytes)
+<examples/id_sexp.{native,byte}>: use_containers_sexp
 <examples/*.ml{,i,y}>: package(bytes)
 <examples/*.ml{,i,y}>: use_containers_sexp
 # OASIS_STOP
@@ -150,4 +147,4 @@ true: annot, bin_annot
 <src/core/CCVector.cmx>: inline(25)
 <src/data/CCFlatHashtbl.cm*> or <src/data/CCHashTrie.cm*> or <src/data/CCPersistent*>: inline(15)
 <src/**/*.ml> and not <src/misc/*.ml>: warn_A, warn(-4), warn(-44)
-true: no_alias_deps, safe_string
+true: no_alias_deps, safe_string, short_paths
diff --git a/benchs/run_benchs.ml b/benchs/run_benchs.ml
index 17bcc401..555ca079 100644
--- a/benchs/run_benchs.ml
+++ b/benchs/run_benchs.ml
@@ -582,8 +582,9 @@ module Tbl = struct
       ; "find_string" @>> app_ints bench_find_string [10; 20; 100; 1_000; 10_000]
       ]);
     B.Tree.register ("tbl_persistent" @>>>
-      let l_int = [persistent_hashtbl Int; persistent_hashtbl_ref Int] in
-      let l_str = [persistent_hashtbl Str; persistent_hashtbl_ref Str] in
+      (* we also compare to the regular Hashtbl, as a frame of reference *)
+      let l_int = [persistent_hashtbl Int; persistent_hashtbl_ref Int; hashtbl_make Int ] in
+      let l_str = [persistent_hashtbl Str; persistent_hashtbl_ref Str; hashtbl_make Str ] in
       [ "add_int" @>> app_ints (bench_add_to l_int) [10; 100; 1_000; 10_000;]
       ; "find_int" @>> app_ints
           (bench_find_to (List.map find_of_mut l_int))
@@ -1032,6 +1033,147 @@ module Thread = struct
   )
 end
 
+module Graph = struct
+
+  (* divisors graph *)
+  let div_children_ i =
+    (* divisors of [i] that are [>= j] *)
+    let rec aux j i yield =
+      if j < i
+      then (
+        if (i mod j = 0) then yield (i,j);
+        aux (j+1) i yield
+      )
+    in
+    aux 1 i
+
+  let div_graph_ = {CCGraph.
+    origin=fst;
+    dest=snd;
+    children=div_children_
+  }
+
+  module H = Hashtbl.Make(CCInt)
+
+  let dfs_raw n () =
+    let explored = H.create (n+10) in
+    let st = Stack.create() in
+    let res = ref 0 in
+    Stack.push n st;
+    while not (Stack.is_empty st) do
+      let i = Stack.pop st in
+      if not (H.mem explored i) then (
+        H.add explored i ();
+        incr res;
+        div_children_ i (fun (_,j) -> Stack.push j st);
+      )
+      done;
+    !res
+
+  let dfs_ n () =
+    let tbl = CCGraph.mk_table ~eq:CCInt.equal ~hash:CCInt.hash (n+10) in
+    CCGraph.Traverse.dfs ~tbl ~graph:div_graph_
+      (Sequence.return n)
+    |> Sequence.fold (fun acc _ -> acc+1) 0
+
+  let dfs_event n () =
+    let tbl = CCGraph.mk_table ~eq:CCInt.equal ~hash:CCInt.hash (n+10) in
+    CCGraph.Traverse.Event.dfs ~tbl ~graph:div_graph_
+      (Sequence.return n)
+    |> Sequence.fold
+      (fun acc -> function
+        | `Enter _ -> acc+1
+        | `Exit _
+        | `Edge _ -> acc)
+      0
+
+  let bench_dfs n =
+    assert (
+      let n1 = dfs_raw n () in
+      let n2 = dfs_ n ()  in
+      let n3 = dfs_event n () in
+      n1 = n2 &&
+      n2 = n3);
+    B.throughputN 2 ~repeat
+      [ "raw", dfs_raw n, ()
+      ; "ccgraph", dfs_ n, ()
+      ; "ccgraph_event", dfs_event n, ()
+      ]
+
+  let () =
+    B.Tree.register ("graph" @>>>
+      [ "dfs" @>>
+        app_ints bench_dfs [100; 1000; 10_000; 50_000; 100_000; 500_000]
+      ]
+    )
+end
+
+module Alloc = struct
+  module type ALLOC_ARR = sig
+    type 'a t
+    val name : string
+    val create : int -> 'a t
+    val make : 'a t -> int -> 'a -> 'a array
+    val free : 'a t -> 'a array -> unit
+  end
+
+  let dummy =
+    let module A = struct
+      type _ t = unit
+      let name = "dummy"
+      let create _ = ()
+      let make _ i x = Array.make i x
+      let free _ _ = ()
+    end in
+    (module A : ALLOC_ARR)
+
+  let alloc_cache ~buck_size =
+    let module A = struct
+      type 'a t = 'a CCAllocCache.Arr.t
+      let name = Printf.sprintf "alloc_cache(%d)" buck_size
+      let create n = CCAllocCache.Arr.create ~buck_size n
+      let make = CCAllocCache.Arr.make
+      let free = CCAllocCache.Arr.free
+    end in
+    (module A : ALLOC_ARR)
+
+  (* repeat [n] times:
+    - repeat [batch] times:
+      - allocate [batch] arrays of size from 1 to batch+1
+    - free those arrays
+  *)
+  let bench1 ~batch n =
+    let make (module C : ALLOC_ARR) () =
+      let c = C.create (batch*2) in
+      let tmp = Array.make (batch * batch) [||] in (* temporary storage *)
+      for _ = 1 to n do
+        for j = 0 to batch-1 do
+          for k = 0 to batch-1 do
+            tmp.(j*batch + k) <- C.make c (k+1) '_';
+          done;
+        done;
+        Array.iter (C.free c) tmp (* free the whole array *)
+      done
+    in
+    B.throughputN 3 ~repeat
+      [ "dummy", make dummy, ()
+      ; "cache(5)", make (alloc_cache ~buck_size:5), ()
+      ; "cache(20)", make (alloc_cache ~buck_size:20), ()
+      ; "cache(50)", make (alloc_cache ~buck_size:50), ()
+      ]
+
+  let () = B.Tree.register (
+    "alloc" @>>>
+      [ "bench1(batch=5)" @>>
+          app_ints (bench1 ~batch:5) [100; 1_000]
+      ; "bench1(batch=15)" @>>
+          app_ints (bench1 ~batch:15) [100; 1_000]
+      ; "bench1(batch=50)" @>>
+          app_ints (bench1 ~batch:50) [100; 1_000]
+      ]
+    )
+end
+
 let () =
   try B.Tree.run_global ()
   with Arg.Help msg -> print_endline msg
diff --git a/containers.odocl b/containers.odocl
index 45828a4a..8cc627ce 100644
--- a/containers.odocl
+++ b/containers.odocl
@@ -1,5 +1,5 @@
 # OASIS_START
-# DO NOT EDIT (digest: a679876a4dd37916033589f8650bb4b2)
+# DO NOT EDIT (digest: e5c366e1cd8e09a92eff04bbdc3ad4f9)
 src/core/CCVector
 src/core/CCPrint
 src/core/CCError
@@ -50,6 +50,7 @@ src/data/CCHashTrie
 src/data/CCBloom
 src/data/CCWBTree
 src/data/CCRAL
+src/data/CCAllocCache
 src/string/Containers_string
 src/string/CCKMP
 src/string/CCLevenshtein
@@ -69,6 +70,5 @@ src/advanced/CCMonadIO
 src/io/Containers_io_is_deprecated
 src/unix/CCUnix
 src/sexp/CCSexp
-src/sexp/CCSexpStream
 src/sexp/CCSexpM
 # OASIS_STOP
diff --git a/doc/intro.txt b/doc/intro.txt
index 8032b938..338a2596 100644
--- a/doc/intro.txt
+++ b/doc/intro.txt
@@ -65,6 +65,7 @@ such as:
 Various data structures.
 
 {!modules:
+CCAllocCache
 CCBitField
 CCBloom
 CCBV
@@ -73,7 +74,6 @@ CCFQueue
 CCFlatHashtbl
 CCHashSet
 CCHashTrie
-CCImmutArray
 CCIntMap
 CCMixmap
 CCMixset
@@ -105,7 +105,6 @@ the main type ([CCSexp.t]) isn't.
 
 {!modules:
 CCSexp
-CCSexpStream
 CCSexpM
 }
 
diff --git a/examples/id_sexp.ml b/examples/id_sexp.ml
index 1adf3080..90e63c27 100644
--- a/examples/id_sexp.ml
+++ b/examples/id_sexp.ml
@@ -3,11 +3,11 @@
 let () =
   if Array.length Sys.argv <> 2 then failwith "usage: id_sexp file";
   let f = Sys.argv.(1) in
-  let s = CCSexpStream.L.of_file f in
+  let s = CCSexpM.parse_file_list f in
   match s with
   | `Ok l ->
       List.iter
-        (fun s -> Format.printf "@[%a@]@." CCSexpStream.print s)
+        (fun s -> Format.printf "@[%a@]@." CCSexpM.print s)
         l
   | `Error msg ->
       Format.printf "error: %s@." msg
diff --git a/examples/id_sexp2.ml b/examples/id_sexp2.ml
deleted file mode 100644
index 90e63c27..00000000
--- a/examples/id_sexp2.ml
+++ /dev/null
@@ -1,13 +0,0 @@
-
-
-let () =
-  if Array.length Sys.argv <> 2 then failwith "usage: id_sexp file";
-  let f = Sys.argv.(1) in
-  let s = CCSexpM.parse_file_list f in
-  match s with
-  | `Ok l ->
-      List.iter
-        (fun s -> Format.printf "@[%a@]@." CCSexpM.print s)
-        l
-  | `Error msg ->
-      Format.printf "error: %s@." msg
diff --git a/myocamlbuild.ml b/myocamlbuild.ml
index 926fb2fd..f6541c4b 100644
--- a/myocamlbuild.ml
+++ b/myocamlbuild.ml
@@ -671,7 +671,6 @@ let dispatch_default = MyOCamlbuildBase.dispatch_default conf package_default;;
 
 # 673 "myocamlbuild.ml"
 (* OASIS_STOP *)
-
 let doc_intro = "doc/intro.txt" ;;
 
 Ocamlbuild_plugin.dispatch dispatch_default;;
diff --git a/opam b/opam
index 1d961671..a3b0dfe8 100644
--- a/opam
+++ b/opam
@@ -28,6 +28,8 @@ depends: [
     "ocamlfind" {build}
     "base-bytes"
     "cppo" {build}
+    "oasis" {build}
+    "ocamlbuild" {build}
 ]
 depopts: [ "sequence" "base-bigarray" "base-unix" "base-threads" ]
 tags: [ "stdlib" "containers" "iterators" "list" "heap" "queue" ]
diff --git a/setup.ml b/setup.ml
index cea46de1..7999dda7 100644
--- a/setup.ml
+++ b/setup.ml
@@ -1,7 +1,7 @@
 (* setup.ml generated for the first time by OASIS v0.4.4 *)
 
 (* OASIS_START *)
-(* DO NOT EDIT (digest: dd2796010195c6abda33b5bf5ecc73ea) *)
+(* DO NOT EDIT (digest: 520720667caa5285972393b25de31806) *)
 (*
    Regenerated by OASIS v0.4.5
    Visit http://oasis.forge.ocamlcore.org for more information and
@@ -6875,7 +6875,7 @@ let setup_t =
           alpha_features = ["ocamlbuild_more_args"];
           beta_features = [];
           name = "containers";
-          version = "0.14";
+          version = "0.15";
           license =
             OASISLicense.DEP5License
               (OASISLicense.DEP5Unit
@@ -7134,7 +7134,7 @@ let setup_t =
                       bs_nativeopt = [(OASISExpr.EBool true, [])]
                    },
                    {
-                      lib_modules = ["CCSexp"; "CCSexpStream"; "CCSexpM"];
+                      lib_modules = ["CCSexp"; "CCSexpM"];
                       lib_pack = false;
                       lib_internal_modules = [];
                       lib_findlib_parent = Some "containers";
@@ -7188,7 +7188,8 @@ let setup_t =
                            "CCHashTrie";
                            "CCBloom";
                            "CCWBTree";
-                           "CCRAL"
+                           "CCRAL";
+                           "CCAllocCache"
                         ];
                       lib_pack = false;
                       lib_internal_modules = [];
@@ -7622,29 +7623,6 @@ let setup_t =
                            InternalExecutable "run_qtest"
                         ]
                    });
-               Executable
-                 ({
-                     cs_name = "id_sexp";
-                     cs_data = PropList.Data.create ();
-                     cs_plugin_data = []
-                  },
-                   {
-                      bs_build = [(OASISExpr.EBool true, true)];
-                      bs_install = [(OASISExpr.EBool true, false)];
-                      bs_path = "examples/";
-                      bs_compiled_object = Best;
-                      bs_build_depends = [InternalLibrary "containers_sexp"];
-                      bs_build_tools = [ExternalTool "ocamlbuild"];
-                      bs_c_sources = [];
-                      bs_data_files = [];
-                      bs_ccopt = [(OASISExpr.EBool true, [])];
-                      bs_cclib = [(OASISExpr.EBool true, [])];
-                      bs_dlllib = [(OASISExpr.EBool true, [])];
-                      bs_dllpath = [(OASISExpr.EBool true, [])];
-                      bs_byteopt = [(OASISExpr.EBool true, [])];
-                      bs_nativeopt = [(OASISExpr.EBool true, [])]
-                   },
-                   {exec_custom = false; exec_main_is = "id_sexp.ml"});
                Executable
                  ({
                      cs_name = "mem_measure";
@@ -7681,7 +7659,7 @@ let setup_t =
                    {exec_custom = false; exec_main_is = "mem_measure.ml"});
                Executable
                  ({
-                     cs_name = "id_sexp2";
+                     cs_name = "id_sexp";
                      cs_data = PropList.Data.create ();
                      cs_plugin_data = []
                   },
@@ -7701,7 +7679,7 @@ let setup_t =
                       bs_byteopt = [(OASISExpr.EBool true, [])];
                       bs_nativeopt = [(OASISExpr.EBool true, [])]
                    },
-                   {exec_custom = false; exec_main_is = "id_sexp2.ml"});
+                   {exec_custom = false; exec_main_is = "id_sexp.ml"});
                SrcRepo
                  ({
                      cs_name = "head";
@@ -7729,7 +7707,7 @@ let setup_t =
        };
      oasis_fn = Some "_oasis";
      oasis_version = "0.4.5";
-     oasis_digest = Some "\016\224&\n\229K}\248\171\001\211\206\025\164lj";
+     oasis_digest = Some "\183\156\139\200Ys\193\023\212>%\209\180\133\193p";
      oasis_exec = None;
      oasis_setup_args = [];
      setup_update = false
@@ -7737,6 +7715,6 @@ let setup_t =
 
 let setup () = BaseSetup.setup setup_t;;
 
-# 7741 "setup.ml"
+# 7719 "setup.ml"
 (* OASIS_STOP *)
 let () = setup ();;
diff --git a/src/core/CCError.ml b/src/core/CCError.ml
index a587ccef..3bc727ee 100644
--- a/src/core/CCError.ml
+++ b/src/core/CCError.ml
@@ -162,6 +162,17 @@ let (<*>) f x = match f with
   | `Error s -> fail s
   | `Ok f -> map f x
 
+let join t = match t with
+  | `Ok (`Ok o) -> `Ok o
+  | `Ok (`Error e) -> `Error e
+  | (`Error _) as e -> e
+
+let both x y =
+  match x,y with
+   | `Ok o, `Ok o' -> `Ok (o, o')
+   | `Ok _, `Error e -> `Error e
+   | `Error e, _  -> `Error e
+
 (** {2 Collections} *)
 
 let map_l f l =
diff --git a/src/core/CCError.mli b/src/core/CCError.mli
index 30d9810a..f7e5fa34 100644
--- a/src/core/CCError.mli
+++ b/src/core/CCError.mli
@@ -141,7 +141,18 @@ val pure : 'a -> ('a, 'err) t
 val (<*>) : ('a -> 'b, 'err) t -> ('a, 'err) t -> ('b, 'err) t
 (** [a <*> b] evaluates [a] and [b], and, in case of success, returns
     [`Ok (a b)]. Otherwise, it fails, and the error of [a] is chosen
-    over the error of [b] if both fail *)
+    over the error of [b] if both fail. *)
+
+val join : (('a, 'err) t, 'err) t -> ('a, 'err) t
+(** [join t], in case of success, returns [`Ok o] from [`Ok (`Ok o)]. Otherwise,
+    it fails with [`Error e] where [e] is the unwrapped error of [t].
+    @since 0.15 *)
+
+val both : ('a, 'err) t  -> ('b, 'err) t -> (('a * 'b), 'err) t
+(** [both a b], in case of success, returns [`Ok (o, o')] with the ok values
+    of [a] and [b]. Otherwise, it fails, and the error of [a] is chosen over the
+    error of [b] if both fail.
+    @since 0.15 *)
 
 (** {2 Infix}
 
diff --git a/src/core/CCFloat.ml b/src/core/CCFloat.ml
index b73b311b..75336d7f 100644
--- a/src/core/CCFloat.ml
+++ b/src/core/CCFloat.ml
@@ -71,11 +71,6 @@ type 'a random_gen = Random.State.t -> 'a
 let pp buf = Printf.bprintf buf "%f"
 let print fmt = Format.pp_print_float fmt
 
-let sign (a:float) =
-  if a < 0.0 then -1
-  else if a > 0.0 then 1
-  else 0
-
 let fsign a =
   if is_nan a then nan
   else if a = 0. then a
diff --git a/src/core/CCFloat.mli b/src/core/CCFloat.mli
index 7485206d..1cc33188 100644
--- a/src/core/CCFloat.mli
+++ b/src/core/CCFloat.mli
@@ -76,11 +76,6 @@ val random : t -> t random_gen
 val random_small : t random_gen
 val random_range : t -> t -> t random_gen
 
-val sign : t -> int
-(** [sign t] is one of [-1, 0, 1], depending on how the float
-    compares to [0.]
-    @deprecated since 0.7 use {! fsign} or {!sign_exn} since it's more accurate *)
-
 val fsign : t -> float
 (** [fsign x] is one of [-1., -0., +0., +1.], or [nan] if [x] is NaN.
     @since 0.7 *)
diff --git a/src/core/CCFormat.ml b/src/core/CCFormat.ml
index bdb425d6..51ec4613 100644
--- a/src/core/CCFormat.ml
+++ b/src/core/CCFormat.ml
@@ -122,24 +122,8 @@ let to_string pp x =
   Format.pp_print_flush fmt ();
   Buffer.contents buf
 
-let sprintf format =
-  let buf = Buffer.create 64 in
-  let fmt = Format.formatter_of_buffer buf in
-  Format.kfprintf
-    (fun _fmt -> Format.pp_print_flush fmt (); Buffer.contents buf)
-    fmt
-    format
-
 let fprintf = Format.fprintf
 
-
-let ksprintf ~f fmt =
-  let buf = Buffer.create 32 in
-  let out = Format.formatter_of_buffer buf in
-  Format.kfprintf
-    (fun _ -> Format.pp_print_flush out (); f (Buffer.contents buf))
-    out fmt
-
 let stdout = Format.std_formatter
 let stderr = Format.err_formatter
 
@@ -159,3 +143,136 @@ let _with_file_out filename f =
 
 let to_file filename format =
   _with_file_out filename (fun fmt -> Format.fprintf fmt format)
+
+type color =
+  [ `Black
+  | `Red
+  | `Yellow
+  | `Green
+  | `Blue
+  | `Magenta
+  | `Cyan
+  | `White
+  ]
+
+let int_of_color_ = function
+  | `Black -> 0
+  | `Red -> 1
+  | `Green -> 2
+  | `Yellow -> 3
+  | `Blue -> 4
+  | `Magenta -> 5
+  | `Cyan -> 6
+  | `White -> 7
+
+type style =
+  [ `FG of color (* foreground *)
+  | `BG of color (* background *)
+  | `Bold
+  | `Reset
+  ]
+
+let code_of_style : style -> int = function
+  | `FG c -> 30 + int_of_color_ c
+  | `BG c -> 40 + int_of_color_ c
+  | `Bold -> 1
+  | `Reset -> 0
+
+let ansi_l_to_str_ = function
+  | [] -> "\x1b[0m"
+  | [a] -> Format.sprintf "\x1b[%dm" (code_of_style a)
+  | [a;b] -> Format.sprintf "\x1b[%d;%dm" (code_of_style a) (code_of_style b)
+  | l ->
+      let pp_num out c = int out (code_of_style c) in
+      to_string (list ~start:"\x1b[" ~stop:"m" ~sep:";" pp_num) l
+
+(* parse a tag *)
+let style_of_tag_ s = match String.trim s with
+  | "reset" -> [`Reset]
+  | "black" -> [`FG `Black]
+  | "red" -> [`FG `Red]
+  | "green" -> [`FG `Green]
+  | "yellow" -> [`FG `Yellow]
+  | "blue" -> [`FG `Blue]
+  | "magenta" -> [`FG `Magenta]
+  | "cyan" -> [`FG `Cyan]
+  | "white" -> [`FG `White]
+  | "Black" -> [`FG `Black]
+  | "Red" -> [`FG `Red; `Bold]
+  | "Green" -> [`FG `Green; `Bold]
+  | "Yellow" -> [`FG `Yellow; `Bold]
+  | "Blue" -> [`FG `Blue; `Bold]
+  | "Magenta" -> [`FG `Magenta; `Bold]
+  | "Cyan" -> [`FG `Cyan; `Bold]
+  | "White" -> [`FG `White; `Bold]
+  | s -> failwith ("unknown style: " ^ s)
+
+let color_enabled = ref false
+
+(* either prints the tag of [s] or delegate to [or_else] *)
+let mark_open_tag ~or_else s =
+  try
+    let style = style_of_tag_ s in
+    if !color_enabled then ansi_l_to_str_ style else ""
+  with Not_found -> or_else s
+
+let mark_close_tag ~or_else s =
+  try
+    let _ = style_of_tag_ s in (* check if it's indeed about color *)
+    if !color_enabled then ansi_l_to_str_ [`Reset] else ""
+  with Not_found -> or_else s
+
+(* add color handling to formatter [ppf] *)
+let set_color_tag_handling ppf =
+  let open Format in
+  let functions = pp_get_formatter_tag_functions ppf () in
+  let functions' = {functions with
+    mark_open_tag=(mark_open_tag ~or_else:functions.mark_open_tag);
+    mark_close_tag=(mark_close_tag ~or_else:functions.mark_close_tag);
+  } in
+  pp_set_mark_tags ppf true; (* enable tags *)
+  pp_set_formatter_tag_functions ppf functions'
+
+let set_color_default =
+  let first = ref true in
+  fun b ->
+    if b && not !color_enabled then (
+      color_enabled := true;
+      if !first then (
+        first := false;
+        set_color_tag_handling stdout;
+        set_color_tag_handling stderr;
+      );
+    ) else if not b && !color_enabled then color_enabled := false
+
+(*$R
+  set_color_default true;
+  let s = sprintf
+    "what is your @{<White>favorite color@}? @{<blue>blue@}! No, @{<red>red@}! Ahhhhhhh@."
+  in
+  assert_equal ~printer:CCFun.id
+    "what is your \027[37;1mfavorite color\027[0m? \027[34mblue\027[0m! No, \027[31mred\027[0m! Ahhhhhhh\n"
+    s
+*)
+
+let sprintf format =
+  let buf = Buffer.create 64 in
+  let fmt = Format.formatter_of_buffer buf in
+  if !color_enabled then set_color_tag_handling fmt;
+  Format.kfprintf
+    (fun _fmt -> Format.pp_print_flush fmt (); Buffer.contents buf)
+    fmt
+    format
+
+(*$T
+  sprintf "yolo %s %d" "a b" 42 = "yolo a b 42"
+  sprintf "%d " 0 = "0 "
+*)
+
+let ksprintf ~f fmt =
+  let buf = Buffer.create 32 in
+  let out = Format.formatter_of_buffer buf in
+  if !color_enabled then set_color_tag_handling out;
+  Format.kfprintf
+    (fun _ -> Format.pp_print_flush out (); f (Buffer.contents buf))
+    out fmt
diff --git a/src/core/CCFormat.mli b/src/core/CCFormat.mli
index bb7279d6..8ab2e98f 100644
--- a/src/core/CCFormat.mli
+++ b/src/core/CCFormat.mli
@@ -66,6 +66,55 @@ val quad : 'a printer -> 'b printer -> 'c printer -> 'd printer -> ('a * 'b * 'c
 
 val map : ('a -> 'b) -> 'b printer -> 'a printer
 
+(** {2 ASCII codes}
+
+  Use ANSI escape codes https://en.wikipedia.org/wiki/ANSI_escape_code
+  to put some colors on the terminal.
+
+  This uses {b tags} in format strings to specify  the style. Current styles
+  are the following:
+
+  {ul
+    {- "reset" resets style}
+    {- "black" }
+    {- "red" }
+    {- "green" }
+    {- "yellow" }
+    {- "blue" }
+    {- "magenta" }
+    {- "cyan" }
+    {- "white" }
+    {- "Black" bold black}
+    {- "Red" bold red }
+    {- "Green" bold green }
+    {- "Yellow" bold yellow }
+    {- "Blue" bold blue }
+    {- "Magenta" bold magenta }
+    {- "Cyan" bold cyan }
+    {- "White" bold white }
+  }
+
+  Example:
+
+  {[
+    set_color_default true;;
+
+    Format.printf
+      "what is your @{<White>favorite color@}? @{<blue>blue@}! No, @{<red>red@}! Ahhhhhhh@.";;
+   ]}
+
+  {b status: experimental}
+  @since 0.15 *)
+
+val set_color_tag_handling : t -> unit
+(** adds functions to support color tags to the given formatter.
+    @since 0.15 *)
+
+val set_color_default : bool -> unit
+(** [set_color_default b] enables color handling on the standard formatters
+    (stdout, stderr) if [b = true] as well as on {!sprintf} formatters;
+    it disables the color handling if [b = false]. *)
+
 (** {2 IO} *)
 
 val output : t -> 'a printer -> 'a -> unit
diff --git a/src/core/CCMap.ml b/src/core/CCMap.ml
index 0fdc6e9e..2dc4a5df 100644
--- a/src/core/CCMap.ml
+++ b/src/core/CCMap.ml
@@ -53,6 +53,14 @@ module type S = sig
   val add_list : 'a t -> (key * 'a) list -> 'a t
   (** @since 0.14 *)
 
+  val keys : _ t -> key sequence
+  (** Iterate on keys only
+      @since 0.15 *)
+
+  val values : 'a t -> 'a sequence
+  (** Iterate on values only
+      @since 0.15 *)
+
   val to_list : 'a t -> (key * 'a) list
 
   val pp : ?start:string -> ?stop:string -> ?arrow:string -> ?sep:string ->
@@ -88,6 +96,12 @@ module Make(O : Map.OrderedType) = struct
   let to_seq m yield =
     iter (fun k v -> yield (k,v)) m
 
+  let keys m yield =
+    iter (fun k _ -> yield k) m
+
+  let values m yield =
+    iter (fun _ v -> yield v) m
+
   let add_list m l = List.fold_left (fun m (k,v) -> add k v m) m l
 
   let of_list l = add_list empty l
diff --git a/src/core/CCMap.mli b/src/core/CCMap.mli
index 51ec28fc..524e56d2 100644
--- a/src/core/CCMap.mli
+++ b/src/core/CCMap.mli
@@ -56,6 +56,14 @@ module type S = sig
   val add_list : 'a t -> (key * 'a) list -> 'a t
   (** @since 0.14 *)
 
+  val keys : _ t -> key sequence
+  (** Iterate on keys only
+      @since 0.15 *)
+
+  val values : 'a t -> 'a sequence
+  (** Iterate on values only
+      @since 0.15 *)
+
   val to_list : 'a t -> (key * 'a) list
 
   val pp : ?start:string -> ?stop:string -> ?arrow:string -> ?sep:string ->
diff --git a/src/core/CCOrd.ml b/src/core/CCOrd.ml
index 4f2ace2a..f1c974b3 100644
--- a/src/core/CCOrd.ml
+++ b/src/core/CCOrd.ml
@@ -59,6 +59,16 @@ let (<?>) c (ord,x,y) =
     then ord x y
     else c
 
+let option c o1 o2 = match o1, o2 with
+  | None, None -> 0
+  | None, Some _ -> -1
+  | Some _, None -> 1
+  | Some x1, Some x2 -> c x1 x2
+
+(*$Q
+  Q.(option int) (fun o -> option int_ None o <= 0)
+  *)
+
 let pair o_x o_y (x1,y1) (x2,y2) =
   let c = o_x x1 x2 in
   if c = 0
diff --git a/src/core/CCOrd.mli b/src/core/CCOrd.mli
index 52dae3b7..9c9ed76a 100644
--- a/src/core/CCOrd.mli
+++ b/src/core/CCOrd.mli
@@ -55,6 +55,10 @@ val (<?>) : int -> ('a t * 'a * 'a) -> int
       <?> (CCBool.compare, true, false)]}
 *)
 
+val option : 'a t -> 'a option t
+(** Comparison of optional values. [None] is smaller than any [Some _].
+    @since 0.15 *)
+
 val pair : 'a t -> 'b t -> ('a * 'b) t
 
 val triple : 'a t -> 'b t -> 'c t -> ('a * 'b * 'c) t
diff --git a/src/core/CCRandom.ml b/src/core/CCRandom.ml
index cc387065..3d762620 100644
--- a/src/core/CCRandom.ml
+++ b/src/core/CCRandom.ml
@@ -78,35 +78,49 @@ let replicate n g st =
     if n = 0 then acc else aux (g st :: acc) (n-1)
   in aux [] n
 
+(* Sample without replacement using rejection sampling. *)
+let sample_without_replacement (type elt)  ?(compare=compare) k (rng:elt t) st=
+  let module S = Set.Make(struct type t=elt let compare = compare end) in
+  let rec aux s k =
+    if k <= 0 then
+      S.elements s
+    else
+      let x = rng st in
+      if S.mem x s then
+        aux s k
+      else
+        aux (S.add x s) (k-1) in
+  aux S.empty k
+
 let list_seq l st = List.map (fun f -> f st) l
 
-exception SplitFail
-
-let _split i st =
-  if i < 2 then raise SplitFail
+let split i st =
+  if i < 2 then None
   else
     let j = 1 + Random.State.int st (i-1) in
-    (j, i-j)
+    Some (j, i-j)
 
-let split i st = try Some (_split i st) with SplitFail -> None
-
-(* Partition of an int into [len] integers. We divide-and-conquer on
-  the expected length, until it reaches 1. *)
-let split_list i ~len st =
-  let rec aux i ~len acc =
-    if i < len then raise SplitFail
-    else if len = 1 then i::acc
-    else
-      (* split somewhere in the middle *)
-      let len1, len2 = _split len st in
-      assert (len = len1+len2);
-      if i = len
-      then aux len1 ~len:len1 (aux len2 ~len:len2 acc)
-      else
-        let i1, i2 = _split (i-len) st in
-        aux (i1+len1) ~len:len1 (aux (i2+len2) ~len:len2 acc)
+let _diff_list ~last l =
+  let rec diff_list acc = function
+    | [a] -> Some ( (last - a)::acc )
+    | a::( b::_ as r ) -> diff_list ( (b-a)::acc ) r
+    | [] -> None
   in
-  try Some (aux i ~len []) with SplitFail -> None
+  diff_list [] l
+
+
+(* Partition of an int into [len] integers uniformly.
+   We first sample (len-1) points from the set {1,..i-1} without replacement.
+   We sort these points and add back 0 and i, we have thus
+   x_0 = 0 < x_1 < x_2 < ... < x_{len-1} < i = x_{len}.
+   If we define, y_k = x_{k+1} - x_{k} for k in 0..(len-1), then by construction
+   ∑_k y_k = ∑_k (x_{k+1} - x_k ) = x_{len} - x_0 = i. *)
+let split_list i ~len st =
+  if i >= len then
+    let xs = sample_without_replacement (len-1) (int_range 1 (i-1)) st in
+    _diff_list ( 0::xs ) ~last:i
+  else
+    None
 
 let retry ?(max=10) g st =
   let rec aux n =
@@ -177,3 +191,31 @@ let (<*>) f g st = f st (g st)
 let __default_state = Random.State.make_self_init ()
 
 let run ?(st=__default_state) g = g st
+
+let uniformity_test ?(size_hint=10) k rng st =
+  let histogram = Hashtbl.create size_hint in
+  let add x = let n = try Hashtbl.find histogram x with Not_found -> 0 in
+    Hashtbl.replace histogram x (n + 1) in
+  let () =
+    for _i = 0 to ( k - 1 ) do
+      add (rng st)
+    done in
+  let cardinal = float_of_int (Hashtbl.length histogram) in
+  let kf = float_of_int k in
+  (* average number of points assuming an uniform distribution *)
+  let average = kf /. cardinal in
+  (* The number of points is a sum of random variables with binomial distribution *)
+  let p = 1. /. cardinal in
+  (* The variance of a binomial distribution with average p is *)
+  let variance = p *. (1. -. p ) in
+  (* Central limit theorem: a confidence interval of 4σ provides a false positive rate
+     of 0.00634% *)
+  let confidence = 4. in
+  let std = confidence *. (sqrt (kf *. variance)) in
+  let predicate _key n acc =
+    acc && abs_float (average -. float_of_int n) < std in
+  Hashtbl.fold predicate histogram true
+
+(*$T split_list
+  run ~st:(Runner.random_state()) ( uniformity_test 50_000 (split_list 10 ~len:3) )
+*)
diff --git a/src/core/CCRandom.mli b/src/core/CCRandom.mli
index e42e1f01..c0b8c604 100644
--- a/src/core/CCRandom.mli
+++ b/src/core/CCRandom.mli
@@ -76,6 +76,14 @@ val replicate : int -> 'a t -> 'a list t
 (** [replicate n g] makes a list of [n] elements which are all generated
     randomly using [g] *)
 
+val sample_without_replacement:
+  ?compare:('a -> 'a -> int) -> int -> 'a t -> 'a list t
+(** [sample_without_replacement n g] makes a list of [n] elements which are all
+    generated randomly using [g] with the added constraint that none of the generated
+    random values are equal
+    @since 0.15
+ *)
+
 val list_seq : 'a t list -> 'a list t
 (** Build random lists from lists of random generators
     @since 0.4 *)
@@ -145,3 +153,11 @@ val (<*>) : ('a -> 'b) t -> 'a t -> 'b t
 
 val run : ?st:state -> 'a t -> 'a
 (** Using a random state (possibly the one in argument) run a generator *)
+
+(**/**)
+
+val uniformity_test : ?size_hint:int -> int -> 'a t -> bool t
+(** [uniformity_test k rng] tests the uniformity of the random generator [rng] using
+    [k] samples.
+    @since 0.15
+*)
diff --git a/src/core/CCVector.ml b/src/core/CCVector.ml
index 2bb0d17a..39f53715 100644
--- a/src/core/CCVector.ml
+++ b/src/core/CCVector.ml
@@ -44,6 +44,8 @@ type ('a,'mut) t = {
 
 type 'a vector = ('a, rw) t
 
+type 'a ro_vector = ('a, ro) t
+
 let freeze v = {
   size=v.size;
   vec=v.vec;
diff --git a/src/core/CCVector.mli b/src/core/CCVector.mli
index d4beb99d..b2c2a2b5 100644
--- a/src/core/CCVector.mli
+++ b/src/core/CCVector.mli
@@ -37,6 +37,10 @@ type ('a, 'mut) t
 type 'a vector = ('a, rw) t
 (** Type synonym: a ['a vector] is mutable. *)
 
+type 'a ro_vector = ('a, ro) t
+(** Alias for immutable vectors.
+    @since 0.15 *)
+
 type 'a sequence = ('a -> unit) -> unit
 type 'a klist = unit -> [`Nil | `Cons of 'a * 'a klist]
 type 'a gen = unit -> 'a option
diff --git a/src/core/META b/src/core/META
index 1083a731..a9bd92fa 100644
--- a/src/core/META
+++ b/src/core/META
@@ -1,6 +1,6 @@
 # OASIS_START
-# DO NOT EDIT (digest: ca67b641b68531561920de2255f04ea0)
-version = "0.14"
+# DO NOT EDIT (digest: c783171c5b71c6a746d5d622c2f8b012)
+version = "0.15"
 description = "A modular standard library focused on data structures."
 requires = "bytes"
 archive(byte) = "containers.cma"
@@ -9,7 +9,7 @@ archive(native) = "containers.cmxa"
 archive(native, plugin) = "containers.cmxs"
 exists_if = "containers.cma"
 package "unix" (
- version = "0.14"
+ version = "0.15"
  description = "A modular standard library focused on data structures."
  requires = "bytes unix"
  archive(byte) = "containers_unix.cma"
@@ -20,7 +20,7 @@ package "unix" (
 )
 
 package "top" (
- version = "0.14"
+ version = "0.15"
  description = "A modular standard library focused on data structures."
  requires =
  "compiler-libs.common containers containers.data containers.bigarray containers.string containers.unix containers.sexp containers.iter"
@@ -32,7 +32,7 @@ package "top" (
 )
 
 package "thread" (
- version = "0.14"
+ version = "0.15"
  description = "A modular standard library focused on data structures."
  requires = "containers threads"
  archive(byte) = "containers_thread.cma"
@@ -43,7 +43,7 @@ package "thread" (
 )
 
 package "string" (
- version = "0.14"
+ version = "0.15"
  description = "A modular standard library focused on data structures."
  requires = "bytes"
  archive(byte) = "containers_string.cma"
@@ -54,7 +54,7 @@ package "string" (
 )
 
 package "sexp" (
- version = "0.14"
+ version = "0.15"
  description = "A modular standard library focused on data structures."
  requires = "bytes"
  archive(byte) = "containers_sexp.cma"
@@ -65,7 +65,7 @@ package "sexp" (
 )
 
 package "iter" (
- version = "0.14"
+ version = "0.15"
  description = "A modular standard library focused on data structures."
  archive(byte) = "containers_iter.cma"
  archive(byte, plugin) = "containers_iter.cma"
@@ -75,7 +75,7 @@ package "iter" (
 )
 
 package "io" (
- version = "0.14"
+ version = "0.15"
  description = "A modular standard library focused on data structures."
  requires = "bytes"
  archive(byte) = "containers_io.cma"
@@ -86,7 +86,7 @@ package "io" (
 )
 
 package "data" (
- version = "0.14"
+ version = "0.15"
  description = "A modular standard library focused on data structures."
  requires = "bytes"
  archive(byte) = "containers_data.cma"
@@ -97,7 +97,7 @@ package "data" (
 )
 
 package "bigarray" (
- version = "0.14"
+ version = "0.15"
  description = "A modular standard library focused on data structures."
  requires = "containers bigarray bytes"
  archive(byte) = "containers_bigarray.cma"
@@ -108,7 +108,7 @@ package "bigarray" (
 )
 
 package "advanced" (
- version = "0.14"
+ version = "0.15"
  description = "A modular standard library focused on data structures."
  requires = "containers sequence"
  archive(byte) = "containers_advanced.cma"
diff --git a/src/core/containers.ml b/src/core/containers.ml
index 1c527b6b..5f5b4b05 100644
--- a/src/core/containers.ml
+++ b/src/core/containers.ml
@@ -79,7 +79,10 @@ module List = struct
   include List
   include CCList
 end
-module Map = CCMap
+module Map = struct
+  module type OrderedType = Map.OrderedType
+  include CCMap
+end
 module Option = CCOpt
 module Pair = CCPair
 module Random = struct
@@ -87,7 +90,10 @@ module Random = struct
   include CCRandom
 end
 module Ref = CCRef
-module Set = CCSet
+module Set = struct
+  module type OrderedType = Set.OrderedType
+  include CCSet
+end
 module String = struct
   include String
   include CCString
diff --git a/src/data/CCAllocCache.ml b/src/data/CCAllocCache.ml
new file mode 100644
index 00000000..3d47c8c7
--- /dev/null
+++ b/src/data/CCAllocCache.ml
@@ -0,0 +1,75 @@
+
+(* This file is free software, part of Logtk. See file "license" for more details. *)
+
+(** {1 Simple Cache for Allocations} *)
+
+module Arr = struct
+  type 'a t = {
+    caches: 'a array array;
+      (* 2-dim array of cached arrays. The 2-dim array is flattened into
+         one dimension *)
+    max_buck_size: int;
+      (* number of cached arrays per length *)
+    sizes: int array;
+      (* number of cached arrays in each bucket *)
+  }
+
+  let create ?(buck_size=16) n =
+    if n<1 then invalid_arg "AllocCache.Arr.create";
+    { max_buck_size=buck_size;
+      sizes=Array.make n 0;
+      caches=Array.make (n * buck_size) [||];
+    }
+
+  let make c i x =
+    if i=0 then [||]
+    else if i<Array.length c.sizes then (
+      let bs = c.sizes.(i) in
+      if bs = 0 then Array.make i x
+      else (
+        (* remove last array *)
+        let ret = c.caches.(i * c.max_buck_size + bs-1) in
+        c.sizes.(i) <- bs - 1;
+        ret
+      )
+    ) else Array.make i x
+
+  let free c a =
+    let n = Array.length a in
+    if n > 0 && n < Array.length c.sizes then (
+      let bs = c.sizes.(n) in
+      if bs < c.max_buck_size then (
+        (* store [a] *)
+        c.caches.(n * c.max_buck_size + bs) <- a;
+        c.sizes.(n) <- bs + 1
+      )
+    )
+
+  let with_ c i x ~f =
+    let a = make c i x in
+    try
+      let ret = f a in
+      free c a;
+      ret
+    with e ->
+      free c a;
+      raise e
+end
+
+(*$inject
+  let c = Arr.create ~buck_size:2 20
+
+*)
+
+(*$Q
+  Q.small_int (fun n -> Array.length (Arr.make c n '_') = n)
+*)
+
+(*$T
+  let a = Arr.make c 1 '_' in Array.length a = 1
+  let a = Arr.make c 2 '_' in Array.length a = 2
+  let a = Arr.make c 3 '_' in Array.length a = 3
+  let a = Arr.make c 4 '_' in Array.length a = 4
+*)
+
+
diff --git a/src/data/CCAllocCache.mli b/src/data/CCAllocCache.mli
new file mode 100644
index 00000000..d8538a96
--- /dev/null
+++ b/src/data/CCAllocCache.mli
@@ -0,0 +1,35 @@
+
+(* This file is free software, part of Logtk. See file "license" for more details. *)
+
+(** {1 Simple Cache for Allocations}
+
+  Be very careful not to use-after-free or double-free.
+
+  {b NOT THREAD SAFE}
+  {b status: experimental}
+
+  @since 0.15
+
+*)
+
+module Arr : sig
+  type 'a t
+  (** Cache for 'a arrays *)
+
+  val create: ?buck_size:int -> int -> 'a t
+  (** [create n] makes a new cache of arrays up to length [n]
+      @param buck_size number of arrays cached for each array length
+      @param n maximum size of arrays put in cache *)
+
+  val make : 'a t -> int -> 'a -> 'a array
+  (** [make cache i x] is like [Array.make i x],
+      but might return a cached array instead of allocating one.
+      {b NOTE}: if the array is already allocated then it
+        will NOT be filled with [x] *)
+
+  val free : 'a t -> 'a array -> unit
+  (** Return array to the cache. The array's elements will not be GC'd *)
+
+  val with_ : 'a t -> int -> 'a -> f:('a array -> 'b) -> 'b
+  (** Combines {!make} and {!free} *)
+end
diff --git a/src/data/CCGraph.mli b/src/data/CCGraph.mli
index e59fc5ea..f8710e82 100644
--- a/src/data/CCGraph.mli
+++ b/src/data/CCGraph.mli
@@ -271,8 +271,11 @@ val scc : ?tbl:('v, 'v scc_state) table ->
 (** Strongly connected components reachable from the given vertices.
     Each component is a list of vertices that are all mutually reachable
     in the graph.
+    The components are explored in a topological order (if C1 and C2 are
+    components, and C1 points to C2, then C2 will be yielded before C1).
     Uses {{: https://en.wikipedia.org/wiki/Tarjan's_strongly_connected_components_algorithm} Tarjan's algorithm}
     @param tbl table used to map nodes to some hidden state
+    @raise Sequence_once if the result is iterated on more than once.
     *)
 
 (** {2 Pretty printing in the DOT (graphviz) format}
diff --git a/src/data/containers_data.mldylib b/src/data/containers_data.mldylib
index 094428e7..797bbd30 100644
--- a/src/data/containers_data.mldylib
+++ b/src/data/containers_data.mldylib
@@ -1,5 +1,5 @@
 # OASIS_START
-# DO NOT EDIT (digest: 69220d33fe7db598cd4d72fc5d813a8f)
+# DO NOT EDIT (digest: f1eb737bc11930f88f05f61212c0f303)
 CCMultiMap
 CCMultiSet
 CCTrie
@@ -23,4 +23,5 @@ CCHashTrie
 CCBloom
 CCWBTree
 CCRAL
+CCAllocCache
 # OASIS_STOP
diff --git a/src/data/containers_data.mllib b/src/data/containers_data.mllib
index 094428e7..797bbd30 100644
--- a/src/data/containers_data.mllib
+++ b/src/data/containers_data.mllib
@@ -1,5 +1,5 @@
 # OASIS_START
-# DO NOT EDIT (digest: 69220d33fe7db598cd4d72fc5d813a8f)
+# DO NOT EDIT (digest: f1eb737bc11930f88f05f61212c0f303)
 CCMultiMap
 CCMultiSet
 CCTrie
@@ -23,4 +23,5 @@ CCHashTrie
 CCBloom
 CCWBTree
 CCRAL
+CCAllocCache
 # OASIS_STOP
diff --git a/src/sexp/CCSexpStream.ml b/src/sexp/CCSexpStream.ml
deleted file mode 100644
index 4dc20ad2..00000000
--- a/src/sexp/CCSexpStream.ml
+++ /dev/null
@@ -1,559 +0,0 @@
-(*
-Copyright (c) 2013, Simon Cruanes
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are met:
-
-Redistributions of source code must retain the above copyright notice, this
-list of conditions and the following disclaimer.  Redistributions in binary
-form must reproduce the above copyright notice, this list of conditions and the
-following disclaimer in the documentation and/or other materials provided with
-the distribution.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
-ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
-FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
-SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
-CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
-OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-*)
-
-(** {1 S-expressions Parser} *)
-
-type 'a or_error = [ `Ok of 'a | `Error of string ]
-type 'a sequence = ('a -> unit) -> unit
-type 'a gen = unit -> 'a option
-
-type t = [
-  | `Atom of string
-  | `List of t list
-  ]
-
-let _with_in filename f =
-  let ic = open_in filename in
-  try
-    let x = f ic in
-    close_in ic;
-    x
-  with e ->
-    close_in ic;
-    `Error (Printexc.to_string e)
-
-let _with_out filename f =
-  let oc = open_out filename in
-  try
-    let x = f oc in
-    close_out oc;
-    x
-  with e ->
-    close_out oc;
-    raise e
-
-(** {2 Serialization (encoding)} *)
-
-(* shall we escape the string because of one of its chars? *)
-let _must_escape s =
-  try
-    for i = 0 to String.length s - 1 do
-      let c = String.unsafe_get s i in
-      match c with
-      | ' ' | ';' | ')' | '(' | '"' | '\n' | '\t' -> raise Exit
-      | _ when Char.code c > 127 -> raise Exit  (* non-ascii *)
-      | _ -> ()
-    done;
-    false
-  with Exit -> true
-
-let rec to_buf b t = match t with
-  | `Atom s when _must_escape s -> Printf.bprintf b "\"%s\"" (String.escaped s)
-  | `Atom s -> Buffer.add_string b s
-  | `List [] -> Buffer.add_string b "()"
-  | `List [x] -> Printf.bprintf b "(%a)" to_buf x
-  | `List l ->
-      Buffer.add_char b '(';
-      List.iteri
-        (fun i t' -> (if i > 0 then Buffer.add_char b ' '; to_buf b t'))
-        l;
-      Buffer.add_char b ')'
-
-let to_string t =
-  let b = Buffer.create 128 in
-  to_buf b t;
-  Buffer.contents b
-
-let rec print fmt t = match t with
-  | `Atom s when _must_escape s -> Format.fprintf fmt "\"%s\"" (String.escaped s)
-  | `Atom s -> Format.pp_print_string fmt s
-  | `List [] -> Format.pp_print_string fmt "()"
-  | `List [x] -> Format.fprintf fmt "@[<hov2>(%a)@]" print x
-  | `List l ->
-      Format.open_hovbox 2;
-      Format.pp_print_char fmt '(';
-      List.iteri
-        (fun i t' -> (if i > 0 then Format.fprintf fmt "@ "; print fmt t'))
-        l;
-      Format.pp_print_char fmt ')';
-      Format.close_box ()
-
-let rec print_noindent fmt t = match t with
-  | `Atom s when _must_escape s -> Format.fprintf fmt "\"%s\"" (String.escaped s)
-  | `Atom s -> Format.pp_print_string fmt s
-  | `List [] -> Format.pp_print_string fmt "()"
-  | `List [x] -> Format.fprintf fmt "(%a)" print_noindent x
-  | `List l ->
-      Format.pp_print_char fmt '(';
-      List.iteri
-        (fun i t' -> (if i > 0 then Format.pp_print_char fmt ' '; print_noindent fmt t'))
-        l;
-      Format.pp_print_char fmt ')'
-
-let to_chan oc t =
-  let fmt = Format.formatter_of_out_channel oc in
-  print fmt t;
-  Format.pp_print_flush fmt ()
-
-let to_file_seq filename seq =
-  _with_out filename
-    (fun oc ->
-      seq (fun t -> to_chan oc t; output_char oc '\n')
-    )
-
-let to_file filename t = to_file_seq filename (fun k -> k t)
-
-(** {2 Deserialization (decoding)} *)
-
-type 'a parse_result = ['a or_error | `End ]
-type 'a partial_result = [ 'a parse_result | `Await ]
-
-module Source = struct
-  type individual_char =
-    | NC_yield of char
-    | NC_end
-    | NC_await
-
-  type t = unit -> individual_char
-  type source = t
-
-  module Manual = struct
-    type t = {
-      mutable i : int;    (* offset *)
-      mutable stop : bool;
-      buf : Buffer.t;     (* accessible chunk of input *)
-    }
-
-    let make() = {
-      i = 0;
-      stop = false;
-      buf=Buffer.create 32;
-    }
-
-    let to_src d () =
-      if d.i = Buffer.length d.buf
-        then
-          if d.stop then NC_end else NC_await
-        else (
-          let c = Buffer.nth d.buf d.i in
-          d.i <- d.i + 1;
-          NC_yield c
-        )
-
-    let feed d s i len =
-      if d.stop then failwith "CCSexpStream.Source.Manual.feed: reached EOI";
-      Buffer.add_substring d.buf s i len
-
-    let reached_end d = d.stop <- true
-  end
-
-  let of_string s =
-    let i = ref 0 in
-    fun () ->
-      if !i=String.length s
-      then NC_end
-      else (
-        let c = String.get s !i in
-        incr i;
-        NC_yield c
-      )
-
-  let of_chan ?(bufsize=1024) ic =
-    let buf = Bytes.make bufsize ' ' in
-    let i = ref 0 in
-    let n = ref 0 in
-    let stop = ref false in
-    let rec next() =
-      if !stop then NC_end
-      else if !i = !n
-      then ( (* refill *)
-        i := 0;
-        n := input ic buf 0 bufsize;
-        if !n = 0 then (stop := true; NC_end) else next()
-      ) else (  (* yield *)
-        let c = Bytes.get buf !i in
-        incr i;
-        NC_yield c
-      )
-    in next
-
-  let of_gen g =
-    let s = ref "" in
-    let i = ref 0 in
-    let stop = ref false in
-    let rec next() =
-      if !stop then NC_end
-      else if !i = String.length !s
-      then (
-        match g() with
-        | None -> stop := true; NC_end
-        | Some buf -> s := buf; i := 0; next ()
-      ) else (
-        let c = String.get !s !i in
-        incr i;
-        NC_yield c
-      )
-    in next
-end
-
-module Lexer = struct
-  (** An individual character returned by a source *)
-  type token =
-    | Open
-    | Close
-    | Atom of string
-
-  type decode_state =
-    | St_start
-    | St_atom
-    | St_quoted
-    | St_comment
-    | St_escaped
-    | St_raw_char1 of int
-    | St_raw_char2 of int
-    | St_yield of token
-    | St_error of string
-    | St_end
-
-  type t = {
-    src : Source.t;
-    atom : Buffer.t;    (* atom being parsed *)
-    mutable st : decode_state;
-    mutable line : int;
-    mutable col : int;
-  }
-
-  let make src = {
-    src;
-    st = St_start;
-    line = 1;
-    col = 1;
-    atom = Buffer.create 32;
-  }
-
-  let of_string s = make (Source.of_string s)
-
-  let of_chan ic = make (Source.of_chan ic)
-
-  let line t = t.line
-  let col t = t.col
-
-  (* yield [x] with current state [st] *)
-  let _yield d st x =
-    d.st <- st;
-    `Ok x
-
-  let _take_buffer b =
-    let s = Buffer.contents b in
-    Buffer.clear b;
-    s
-
-  (* raise an error *)
-  let _error d msg =
-    let b = Buffer.create 32 in
-    Printf.bprintf b "at %d, %d: " d.line d.col;
-    Printf.kbprintf
-      (fun b ->
-        let msg' = Buffer.contents b in
-        d.st <- St_error msg';
-        `Error msg')
-      b msg
-
-  let _end d =
-    d.st <- St_end;
-    `End
-
-  let _is_digit c = Char.code '0' <= Char.code c && Char.code c <= Char.code '9'
-  let _digit2i c = Char.code c - Char.code '0'
-
-  (* next token *)
-  let rec _next d st : token partial_result =
-    match st with
-    | St_error msg -> `Error msg
-    | St_end -> _end d
-    | St_yield x ->
-        (* yield the given token, then start a fresh one *)
-        _yield d St_start x
-    | _ ->
-        d.st <- st;
-        _process_next d st
-
-  (* read and process the next character *)
-  and _process_next d st =
-    match d.src () with
-    | Source.NC_end ->
-        begin match st with
-        | St_error _ | St_end | St_yield _ -> assert false
-        | St_start | St_comment -> _end d
-        | St_atom ->
-            let a = _take_buffer d.atom in
-            _yield d St_end (Atom a)
-        | St_quoted ->
-            let a = _take_buffer d.atom in
-            _yield d St_end (Atom a)
-        | (St_escaped | St_raw_char1 _ | St_raw_char2 _) ->
-            _error d "unexpected end of input (escaping)"
-        end
-    | Source.NC_await -> `Await
-    | Source.NC_yield c ->
-        if c='\n'
-          then (d.col <- 1; d.line <- d.line + 1)
-          else (d.col <- d.col + 1);
-        (* use the next char *)
-        match st with
-        | St_error _ | St_end | St_yield _ -> assert false
-        | St_comment ->
-            begin match c with
-            | '\n' -> _next d St_start
-            | _ -> _next d St_comment
-            end
-        | St_start ->
-            begin match c with
-            | ' ' | '\t' | '\n' -> _next d St_start
-            | ';' -> _next d St_comment
-            | '(' -> _yield d St_start Open
-            | ')' -> _yield d St_start Close
-            | '"' -> _next d St_quoted
-            | _ -> (* read regular atom *)
-                Buffer.add_char d.atom c;
-                _next d St_atom
-            end
-        | St_atom ->
-            begin match c with
-            | ' ' | '\t' | '\n' ->
-                let a = _take_buffer d.atom in
-                _yield d St_start (Atom a)
-            | ';' ->
-                let a = _take_buffer d.atom in
-                _yield d St_comment (Atom a)
-            | ')' ->
-                let a = _take_buffer d.atom in
-                _yield d (St_yield Close) (Atom a)
-            | '(' ->
-                let a = _take_buffer d.atom in
-                _yield d (St_yield Open) (Atom a)
-            | '"' -> _error d "unexpected \" (parsing atom %s)" (Buffer.contents d.atom)
-            | '\\' -> _error d "unexpected \\"
-            | _ ->
-                Buffer.add_char d.atom c;
-                _next d St_atom
-            end
-        | St_quoted ->
-            (* reading an unquoted atom *)
-            begin match c with
-            | '\\' -> _next d St_escaped
-            | '"' ->
-                let a = _take_buffer d.atom in
-                _yield d St_start (Atom a)
-            | _ ->
-                Buffer.add_char d.atom c;
-                _next d St_quoted
-            end
-        | St_escaped ->
-            begin match c with
-              | 'n' -> Buffer.add_char d.atom '\n'; _next d St_quoted
-              | 't' -> Buffer.add_char d.atom '\t'; _next d St_quoted
-              | 'r' -> Buffer.add_char d.atom '\r'; _next d St_quoted
-              | 'b' -> Buffer.add_char d.atom '\b'; _next d St_quoted
-              | '"' -> Buffer.add_char d.atom '"'; _next d St_quoted
-              | '\\' -> Buffer.add_char d.atom '\\'; _next d St_quoted
-              | _ when _is_digit c -> _next d (St_raw_char1 (_digit2i c))
-              | _ -> _error d "unexpected escaped character %c" c
-            end
-        | St_raw_char1 i ->
-            begin match c with
-              | _ when _is_digit c -> _next d (St_raw_char2 (i*10 + _digit2i c))
-              | _ -> _error d "expected digit, got %c" c
-            end
-        | St_raw_char2 i ->
-            begin match c with
-              | c when _is_digit c ->
-                  (* read an escaped char *)
-                  Buffer.add_char d.atom (Char.chr (i*10+_digit2i c));
-                  _next d St_quoted
-              | c -> _error d "expected digit, got %c" c
-            end
-
-  let next d = _next d d.st
-end
-
-module ParseGen = struct
-  type 'a t = unit -> 'a parse_result
-
-  let to_list g : 'a list or_error =
-    let rec aux acc = match g() with
-      | `Error e -> `Error e
-      | `Ok x -> aux (x::acc)
-      | `End -> `Ok (List.rev acc)
-    in
-    aux []
-
-  let head g = match g() with
-    | `End -> `Error "expected at least one element"
-    | #or_error as x -> x
-
-  let head_exn g = match g() with
-    | `Ok x -> x
-    | `Error msg -> failwith msg
-    | `End -> failwith "expected at least one element"
-
-  let take n g =
-    assert (n>=0);
-    let n = ref n in
-    fun () ->
-      if !n = 0 then `End
-      else (
-        decr n;
-        g()
-      )
-end
-
-(* hidden parser state *)
-type parser_state = {
-  ps_d : Lexer.t;
-  mutable ps_stack : t list list;
-}
-
-let mk_ps src = {
-  ps_d = Lexer.make src;
-  ps_stack = [];
-}
-
-let _error ps msg =
-  let msg' = Printf.sprintf "at %d,%d: %s" (Lexer.line ps.ps_d) (Lexer.col ps.ps_d) msg in
-  `Error msg'
-
-(* next token, or await *)
-let rec _next ps : t partial_result =
-  match Lexer.next ps.ps_d with
-  | `Ok (Lexer.Atom s) ->
-      _push ps (`Atom s)
-  | `Ok Lexer.Open ->
-      ps.ps_stack <- [] :: ps.ps_stack;
-      _next ps
-  | `Ok Lexer.Close ->
-      begin match ps.ps_stack with
-      | [] -> _error ps "unbalanced ')'"
-      | l :: stack ->
-          ps.ps_stack <- stack;
-          _push ps (`List (List.rev l))
-      end
-  | `Error msg -> `Error msg
-  | `Await -> `Await
-  | `End -> `End
-
-(* push a S-expr on top of the parser stack *)
-and _push ps e = match ps.ps_stack with
-  | [] ->
-      `Ok e
-  | l :: tl ->
-      ps.ps_stack <- (e :: l) :: tl;
-      _next ps
-
-(* assume [ps] never needs [`Await] *)
-let _never_block ps () = match _next ps with
-  | `Await -> assert false
-  | `Ok x -> `Ok x
-  | `Error e -> `Error e
-  | `End -> `End
-
-(* parse from a generator of string slices *)
-let parse_gen g : t ParseGen.t =
-  let ps = mk_ps (Source.of_gen g) in
-  _never_block ps
-
-let parse_string s =
-  let ps = mk_ps (Source.of_string s) in
-  _never_block ps
-
-let parse_chan ?bufsize ic =
-  let ps = mk_ps (Source.of_chan ?bufsize ic) in
-  _never_block ps
-
-(** {6 Blocking} *)
-
-let of_chan ic =
-  ParseGen.head (parse_chan ic)
-
-let of_string s =
-  ParseGen.head (parse_string s)
-
-let of_file f =
-  _with_in f of_chan
-
-module L = struct
-  let to_buf b l =
-    List.iter (to_buf b) l
-
-  let to_string l =
-    let b = Buffer.create 32 in
-    to_buf b l;
-    Buffer.contents b
-
-  let to_chan oc l =
-    let fmt = Format.formatter_of_out_channel oc in
-    List.iter (Format.fprintf fmt "%a@." print) l;
-    Format.pp_print_flush fmt ()
-
-  let to_file filename l =
-    _with_out filename (fun oc -> to_chan oc l)
-
-  let of_chan ?bufsize ic =
-    ParseGen.to_list (parse_chan ?bufsize ic)
-
-  let of_file ?bufsize filename =
-    _with_in filename
-      (fun ic -> of_chan ?bufsize ic)
-
-  let of_string s =
-    ParseGen.to_list (parse_string s)
-
-  let of_gen g =
-    ParseGen.to_list (parse_gen g)
-
-  exception OhNoes of string
-  exception StopNaow
-
-  let of_seq seq =
-    let src = Source.Manual.make () in
-    let ps = mk_ps (Source.Manual.to_src src) in
-    let l = ref [] in
-    (* read as many expressions as possible *)
-    let rec _nexts () = match _next ps with
-      | `Ok x -> l := x :: !l; _nexts ()
-      | `Error e -> raise (OhNoes e)
-      | `End -> raise StopNaow
-      | `Await -> ()
-    in
-    try
-      seq
-        (fun s -> Source.Manual.feed src s 0 (String.length s); _nexts ());
-      Source.Manual.reached_end src;
-      _nexts ();
-      `Ok (List.rev !l)
-    with
-    | OhNoes msg -> `Error msg
-    | StopNaow -> `Ok (List.rev !l)
-end
diff --git a/src/sexp/CCSexpStream.mli b/src/sexp/CCSexpStream.mli
deleted file mode 100644
index 2c87e38d..00000000
--- a/src/sexp/CCSexpStream.mli
+++ /dev/null
@@ -1,199 +0,0 @@
-(*
-Copyright (c) 2013, Simon Cruanes
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are met:
-
-Redistributions of source code must retain the above copyright notice, this
-list of conditions and the following disclaimer.  Redistributions in binary
-form must reproduce the above copyright notice, this list of conditions and the
-following disclaimer in the documentation and/or other materials provided with
-the distribution.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
-ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
-FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
-SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
-CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
-OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-*)
-
-(** {1 S-expressions Parser}
-
-@since 0.4
-@deprecated consider using {!CCSexpM} *)
-
-type 'a or_error = [ `Ok of 'a | `Error of string ]
-type 'a sequence = ('a -> unit) -> unit
-type 'a gen = unit -> 'a option
-
-type t = [
-  | `Atom of string
-  | `List of t list
-  ]
-
-(** {2 Serialization (encoding)} *)
-
-val to_buf : Buffer.t -> t -> unit
-
-val to_string : t -> string
-
-val to_file : string -> t -> unit
-
-val to_file_seq : string -> t sequence -> unit
-(** Print the given sequence of expressions to a file *)
-
-val to_chan : out_channel -> t -> unit
-
-val print : Format.formatter -> t -> unit
-(** Pretty-printer nice on human eyes (including indentation) *)
-
-val print_noindent : Format.formatter -> t -> unit
-(** Raw, direct printing as compact as possible *)
-
-(** {2 Deserialization (decoding)} *)
-
-type 'a parse_result = ['a or_error | `End ]
-type 'a partial_result = [ 'a parse_result | `Await ]
-
-(** {6 Source of characters} *)
-module Source : sig
-  type individual_char =
-    | NC_yield of char
-    | NC_end
-    | NC_await
-  (** An individual character returned by a source *)
-
-  type t = unit -> individual_char
-  (** A source of characters can yield them one by one, or signal the end,
-      or signal that some external intervention is needed *)
-
-  type source = t
-
-  (** A manual source of individual characters. When it has exhausted its
-      own input, it asks its caller to provide more or signal that none remains.
-      This is especially useful when the source of data is monadic IO *)
-  module Manual : sig
-    type t
-
-    val make : unit -> t
-    (** Make a new manual source. It needs to be fed input manually,
-        using {!feed} *)
-
-    val to_src : t -> source
-    (** The manual source contains a source! *)
-
-    val feed : t -> string -> int -> int -> unit
-    (** Feed a chunk of input to the manual source *)
-
-    val reached_end : t -> unit
-    (** Tell the decoder that end of input has been reached. From now
-        the source will only yield [NC_end] *)
-  end
-
-  val of_string : string -> t
-  (** Use a single string as the source *)
-
-  val of_chan : ?bufsize:int -> in_channel -> t
-  (** Use a channel as the source *)
-
-  val of_gen : string gen -> t
-end
-
-(** {6 Streaming Lexer}
-Splits the input into opening parenthesis, closing ones, and atoms *)
-
-module Lexer : sig
-  type t
-  (** A streaming lexer, that parses atomic chunks of S-expressions (atoms
-      and delimiters) *)
-
-  val make : Source.t -> t
-  (** Create a lexer that uses the given source of characters as an input *)
-
-  val of_string : string -> t
-
-  val of_chan : in_channel -> t
-
-  val line : t -> int
-  val col : t -> int
-
-  (** Obtain next token *)
-
-  type token =
-    | Open
-    | Close
-    | Atom of string
-  (** An individual S-exp token *)
-
-  val next : t -> token partial_result
-  (** Obtain the next token, an error, or block/end stream *)
-end
-
-(** {6 Generator with errors} *)
-module ParseGen : sig
-  type 'a t = unit -> 'a parse_result
-  (** A generator-like structure, but with the possibility of errors.
-      When called, it can yield a new element, signal the end of stream,
-      or signal an error. *)
-
-  val to_list : 'a t -> 'a list or_error
-
-  val head : 'a t -> 'a or_error
-
-  val head_exn : 'a t -> 'a
-
-  val take : int -> 'a t -> 'a t
-end
-
-(** {6 Stream Parser}
-Returns a lazy stream of S-expressions. *)
-
-val parse_string : string -> t ParseGen.t
-(** Parse a string *)
-
-val parse_chan : ?bufsize:int -> in_channel -> t ParseGen.t
-(** Parse a channel *)
-
-val parse_gen : string gen -> t ParseGen.t
-(** Parse chunks of string *)
-
-(** {6 Blocking API}
-Parse one S-expression from some source.  *)
-
-val of_chan : in_channel -> t or_error
-(** Parse a S-expression from the given channel. Can read more data than
-    necessary, so don't use this if you need finer-grained control (e.g.
-    to read something else {b after} the S-exp) *)
-
-val of_string : string -> t or_error
-
-val of_file : string -> t or_error
-(** Open the file and read a S-exp from it *)
-
-(** {6 Lists of S-exps} *)
-
-module L : sig
-  val to_buf : Buffer.t -> t list -> unit
-
-  val to_string : t list -> string
-
-  val to_file : string -> t list -> unit
-
-  val to_chan : out_channel -> t list -> unit
-
-  val of_chan : ?bufsize:int -> in_channel -> t list or_error
-
-  val of_file : ?bufsize:int -> string -> t list or_error
-
-  val of_string : string -> t list or_error
-
-  val of_gen : string gen -> t list or_error
-
-  val of_seq : string sequence -> t list or_error
-end
diff --git a/src/sexp/containers_sexp.mldylib b/src/sexp/containers_sexp.mldylib
index d0508313..fb76d5af 100644
--- a/src/sexp/containers_sexp.mldylib
+++ b/src/sexp/containers_sexp.mldylib
@@ -1,6 +1,5 @@
 # OASIS_START
-# DO NOT EDIT (digest: e7d1bfe0f18e27e2b9ff76951f3a9524)
+# DO NOT EDIT (digest: 3a36b0ae70bf5e8f3f11d6a4f5f7d948)
 CCSexp
-CCSexpStream
 CCSexpM
 # OASIS_STOP
diff --git a/src/sexp/containers_sexp.mllib b/src/sexp/containers_sexp.mllib
index d0508313..fb76d5af 100644
--- a/src/sexp/containers_sexp.mllib
+++ b/src/sexp/containers_sexp.mllib
@@ -1,6 +1,5 @@
 # OASIS_START
-# DO NOT EDIT (digest: e7d1bfe0f18e27e2b9ff76951f3a9524)
+# DO NOT EDIT (digest: 3a36b0ae70bf5e8f3f11d6a4f5f7d948)
 CCSexp
-CCSexpStream
 CCSexpM
 # OASIS_STOP