diff --git a/sledge/src/domain/itv.ml b/sledge/src/domain/itv.ml
index 1e8e4d718..a4cfe10d7 100644
--- a/sledge/src/domain/itv.ml
+++ b/sledge/src/domain/itv.ml
@@ -171,8 +171,9 @@ let assign reg exp q =
   ;
   let lval = apron_var_of_reg reg in
   ( match
-      apron_typ_of_llair_typ (Reg.typ reg)
-      >>= apron_texpr_of_llair_term (Exp.term exp) q
+      Option.bind
+        ~f:(apron_texpr_of_llair_term (Exp.term exp) q)
+        (apron_typ_of_llair_typ (Reg.typ reg))
     with
   | Some e ->
       let env = Abstract1.env q in
@@ -195,8 +196,9 @@ let assign reg exp q =
 (** block if [e] is known to be false; skip otherwise *)
 let exec_assume q e =
   match
-    apron_typ_of_llair_typ (Exp.typ e)
-    >>= apron_texpr_of_llair_term (Exp.term e) q
+    Option.bind
+      ~f:(apron_texpr_of_llair_term (Exp.term e) q)
+      (apron_typ_of_llair_typ (Exp.typ e))
   with
   | Some e ->
       let cond =
@@ -247,7 +249,7 @@ let exec_intrinsic ~skip_throw:_ pre aret i _ =
       ; "mallctlbymib"; "malloc_stats_print"; "strlen"
       ; "__cxa_allocate_exception"; "_ZN5folly13usingJEMallocEv" ]
       ~f:(String.equal name)
-  then aret >>| (exec_kill pre >> Option.some)
+  then Option.map ~f:(Option.some << exec_kill pre) aret
   else None
 
 type from_call = {areturn: Reg.t option; caller_q: t} [@@deriving sexp_of]
diff --git a/sledge/src/import/import.ml b/sledge/src/import/import.ml
index 8562841bb..f72ebdb84 100644
--- a/sledge/src/import/import.ml
+++ b/sledge/src/import/import.ml
@@ -40,6 +40,7 @@ let trd3 (_, _, z) = z
 (** Function combinators *)
 
 let ( >> ) f g x = g (f x)
+let ( << ) f g x = f (g x)
 let ( $ ) f g x = f x ; g x
 let ( $> ) x f = f x ; x
 let ( <$ ) f x = f x ; x
diff --git a/sledge/src/import/import.mli b/sledge/src/import/import.mli
index 9a483dce5..adaff7758 100644
--- a/sledge/src/import/import.mli
+++ b/sledge/src/import/import.mli
@@ -47,17 +47,21 @@ val ( >> ) : ('a -> 'b) -> ('b -> 'c) -> 'a -> 'c
 (** Composition of functions: [(f >> g) x] is exactly equivalent to [g (f
     (x))]. Left associative. *)
 
+val ( << ) : ('b -> 'c) -> ('a -> 'b) -> 'a -> 'c
+(** Reverse composition of functions: [(g << f) x] is exactly equivalent to
+    [g (f (x))]. Left associative. *)
+
 val ( $ ) : ('a -> unit) -> ('a -> 'b) -> 'a -> 'b
 (** Sequential composition of functions: [(f $ g) x] is exactly equivalent
     to [(f x) ; (g x)]. Left associative. *)
 
 val ( $> ) : 'a -> ('a -> unit) -> 'a
-(** Apply and ignore function: [x $> f] is exactly equivalent to [f x ; x].
-    Left associative. *)
+(** Reverse apply and ignore function: [x $> f] is exactly equivalent to [f
+    x ; x]. Left associative. *)
 
 val ( <$ ) : ('a -> unit) -> 'a -> 'a
-(** Reverse apply and ignore function: [f <$ x] is exactly equivalent to [f
-    x ; x]. Left associative. *)
+(** Apply and ignore function: [f <$ x] is exactly equivalent to [f x ; x].
+    Left associative. *)
 
 (** Pretty-printing *)
 
diff --git a/sledge/src/llair/frontend.ml b/sledge/src/llair/frontend.ml
index d3bd8b162..0845b1184 100644
--- a/sledge/src/llair/frontend.ml
+++ b/sledge/src/llair/frontend.ml
@@ -642,9 +642,10 @@ and xlate_opcode : x -> Llvm.llvalue -> Llvm.Opcode.t -> Exp.t =
                 (ptr_idx x ~ptr ~idx ~llelt, llelt)
             | Struct ->
                 let fld =
-                  Option.bind ~f:Int64.to_int
-                    (Llvm.int64_of_const (Llvm.operand llv i))
-                  |> function
+                  match
+                    Option.bind ~f:Int64.to_int
+                      (Llvm.int64_of_const (Llvm.operand llv i))
+                  with
                   | Some n -> n
                   | None -> fail "xlate_opcode: %i %a" i pp_llvalue llv ()
                 in
diff --git a/sledge/src/llair/llair.ml b/sledge/src/llair/llair.ml
index b053a91e9..e42cf6930 100644
--- a/sledge/src/llair/llair.ml
+++ b/sledge/src/llair/llair.ml
@@ -547,7 +547,8 @@ let set_derived_metadata functions =
         | Iswitch {tbl; _} -> Vector.iter tbl ~f:jump
         | Call ({callee; return; throw; _} as call) ->
             ( match
-                Reg.of_exp callee >>| Reg.name >>= Func.find functions
+                Option.bind ~f:(Func.find functions)
+                  (Option.map ~f:Reg.name (Reg.of_exp callee))
               with
             | Some func ->
                 if Set.mem ancestors func.entry then call.recursive <- true
diff --git a/sledge/src/symbheap/sh_domain.ml b/sledge/src/symbheap/sh_domain.ml
index 473b8c75d..ccf33d65b 100644
--- a/sledge/src/symbheap/sh_domain.ml
+++ b/sledge/src/symbheap/sh_domain.ml
@@ -283,8 +283,7 @@ let apply_summary q ({xs; foot; post} as fs) =
     if Set.is_empty xs_in_fv_q then Solver.infer_frame q xs foot else None
   in
   [%Trace.info "frame %a" (Option.pp "%a" pp) frame] ;
-  Option.map ~f:(Sh.star post) frame
-  |> Option.map ~f:(Sh.extend_us add_back)
+  Option.map ~f:(Sh.extend_us add_back) (Option.map ~f:(Sh.star post) frame)
   |>
   [%Trace.retn fun {pf} r ->
     match r with None -> pf "None" | Some q -> pf "@,%a" pp q]