Convert to task syntax

35 files changed, 117 insertions, 79 deletions

diff --git a/src/cjr.sml b/src/cjr.sml
index 9be54670..f5392d49 100644
--- a/src/cjr.sml
+++ b/src/cjr.sml
@@ -100,6 +100,8 @@ datatype exp' =
 
 withtype exp = exp' located
 
+datatype task = Initialize
+
 datatype decl' =
          DStruct of int * (string * typ) list
        | DDatatype of (datatype_kind * string * int * (string * int * typ option) list) list
@@ -118,7 +120,7 @@ datatype decl' =
        | DCookie of string
        | DStyle of string
 
-       | DInitializer of exp
+       | DTask of task * exp
 
 withtype decl = decl' located
 
diff --git a/src/cjr_env.sml b/src/cjr_env.sml
index e4d978d5..ac83f263 100644
--- a/src/cjr_env.sml
+++ b/src/cjr_env.sml
@@ -171,6 +171,6 @@ fun declBinds env (d, loc) =
       | DJavaScript _ => env
       | DCookie _ => env
       | DStyle _ => env
-      | DInitializer _ => env
+      | DTask _ => env
 
 end
diff --git a/src/cjr_print.sml b/src/cjr_print.sml
index 6a5116ce..2d547519 100644
--- a/src/cjr_print.sml
+++ b/src/cjr_print.sml
@@ -2099,7 +2099,7 @@ fun p_decl env (dAll as (d, _) : decl) =
                          space,
                          string "*/"]
 
-      | DInitializer _ => box []
+      | DTask _ => box []
 
 datatype 'a search =
          Found of 'a
@@ -2733,7 +2733,7 @@ fun p_file env (ds, ps) =
                  string "}",
                  newline]
 
-        val initializers = List.mapPartial (fn (DInitializer e, _) => SOME e | _ => NONE) ds
+        val initializers = List.mapPartial (fn (DTask (Initialize, e), _) => SOME e | _ => NONE) ds
     in
         box [string "#include <stdio.h>",
              newline,
diff --git a/src/cjrize.sml b/src/cjrize.sml
index 3936f6a5..0136bdf6 100644
--- a/src/cjrize.sml
+++ b/src/cjrize.sml
@@ -660,13 +660,17 @@ fun cifyDecl ((d, loc), sm) =
       | L.DJavaScript s => (SOME (L'.DJavaScript s, loc), NONE, sm)
       | L.DCookie args => (SOME (L'.DCookie args, loc), NONE, sm)
       | L.DStyle args => (SOME (L'.DStyle args, loc), NONE, sm)
-      | L.DInitializer e =>
-        (case #1 e of
+      | L.DTask (e1, e2) =>
+        (case #1 e2 of
              L.EAbs (_, _, _, e) =>
              let
+                 val tk = case #1 e1 of
+                              L.EFfi ("Basis", "initialize") => L'.Initialize
+                            | _ => (ErrorMsg.errorAt loc "Task kind not fully determined";
+                                    L'.Initialize)
                  val (e, sm) = cifyExp (e, sm)
              in
-                 (SOME (L'.DInitializer e, loc), NONE, sm)
+                 (SOME (L'.DTask (tk, e), loc), NONE, sm)
              end
            | _ => (ErrorMsg.errorAt loc "Initializer has not been fully determined";
                    (NONE, NONE, sm)))
diff --git a/src/core.sml b/src/core.sml
index a60bfd3b..78a1eded 100644
--- a/src/core.sml
+++ b/src/core.sml
@@ -134,7 +134,7 @@ datatype decl' =
        | DDatabase of string
        | DCookie of string * int * con * string
        | DStyle of string * int * string
-       | DInitializer of exp
+       | DTask of exp * exp
 
 withtype decl = decl' located
 
diff --git a/src/core_env.sml b/src/core_env.sml
index 5e0af98c..4c50bdd7 100644
--- a/src/core_env.sml
+++ b/src/core_env.sml
@@ -348,7 +348,7 @@ fun declBinds env (d, loc) =
         in
             pushENamed env x n t NONE s
         end
-      | DInitializer _ => env
+      | DTask _ => env
 
 fun patBinds env (p, loc) =
     case p of
diff --git a/src/core_print.sml b/src/core_print.sml
index 7dd43d56..c1f93587 100644
--- a/src/core_print.sml
+++ b/src/core_print.sml
@@ -611,9 +611,13 @@ fun p_decl env (dAll as (d, _) : decl) =
                                  string "as",
                                  space,
                                  string s]
-      | DInitializer e => box [string "initializer",
+      | DTask (e1, e2) => box [string "task",
                                space,
-                               p_exp env e]
+                               p_exp env e1,
+                               space,
+                               string "=",
+                               space,
+                               p_exp env e2]
 
 fun p_file env file =
     let
diff --git a/src/core_util.sml b/src/core_util.sml
index 7ead1157..599e1abc 100644
--- a/src/core_util.sml
+++ b/src/core_util.sml
@@ -971,10 +971,12 @@ fun mapfoldB {kind = fk, con = fc, exp = fe, decl = fd, bind} =
                      fn c' =>
                         (DCookie (x, n, c', s), loc))
               | DStyle _ => S.return2 dAll
-              | DInitializer e =>
-                S.map2 (mfe ctx e,
-                     fn e' =>
-                        (DInitializer e', loc))
+              | DTask (e1, e2) =>
+                S.bind2 (mfe ctx e1,
+                     fn e1' =>
+                        S.map2 (mfe ctx e2,
+                             fn e2' =>
+                                (DTask (e1', e2'), loc)))
 
         and mfvi ctx (x, n, t, e, s) =
             S.bind2 (mfc ctx t,
@@ -1129,7 +1131,7 @@ fun mapfoldB (all as {bind, ...}) =
                                         in
                                             bind (ctx, NamedE (x, n, t, NONE, s))
                                         end
-                                      | DInitializer _ => ctx
+                                      | DTask _ => ctx
                             in
                                 S.map2 (mff ctx' ds',
                                      fn ds' =>
@@ -1193,7 +1195,7 @@ val maxName = foldl (fn ((d, _) : decl, count) =>
                           | DDatabase _ => count
                           | DCookie (_, n, _, _) => Int.max (n, count)
                           | DStyle (_, n, _) => Int.max (n, count)
-                          | DInitializer _ => count) 0
+                          | DTask _ => count) 0
               
 end
 
diff --git a/src/corify.sml b/src/corify.sml
index cc0500af..9259b4f2 100644
--- a/src/corify.sml
+++ b/src/corify.sml
@@ -1064,8 +1064,8 @@ fun corifyDecl mods (all as (d, loc : EM.span), st) =
             ([(L'.DStyle (x, n, s), loc)], st)
         end
 
-      | L.DInitializer e =>
-        ([(L'.DInitializer (corifyExp st e), loc)], st)
+      | L.DTask (e1, e2) =>
+        ([(L'.DTask (corifyExp st e1, corifyExp st e2), loc)], st)
 
 and corifyStr mods ((str, _), st) =
     case str of
@@ -1124,7 +1124,7 @@ fun maxName ds = foldl (fn ((d, _), n) =>
                              | L.DDatabase _ => n
                              | L.DCookie (_, _, n', _) => Int.max (n, n')
                              | L.DStyle (_, _, n') => Int.max (n, n')
-                             | L.DInitializer _ => n)
+                             | L.DTask _ => n)
                        0 ds
 
 and maxNameStr (str, _) =
diff --git a/src/elab.sml b/src/elab.sml
index 1cd7aefa..a0f9a4e8 100644
--- a/src/elab.sml
+++ b/src/elab.sml
@@ -170,7 +170,7 @@ datatype decl' =
        | DDatabase of string
        | DCookie of int * string * int * con
        | DStyle of int * string * int
-       | DInitializer of exp
+       | DTask of exp * exp
 
      and str' =
          StrConst of decl list
diff --git a/src/elab_env.sml b/src/elab_env.sml
index 763cf801..5092c6fb 100644
--- a/src/elab_env.sml
+++ b/src/elab_env.sml
@@ -1622,6 +1622,6 @@ fun declBinds env (d, loc) =
         in
             pushENamedAs env x n t
         end
-      | DInitializer _ => env
+      | DTask _ => env
 
 end
diff --git a/src/elab_print.sml b/src/elab_print.sml
index 906c836d..62b5262f 100644
--- a/src/elab_print.sml
+++ b/src/elab_print.sml
@@ -799,9 +799,13 @@ fun p_decl env (dAll as (d, _) : decl) =
       | DStyle (_, x, n) => box [string "style",
                                  space,
                                  p_named x n]
-      | DInitializer e => box [string "initializer",
+      | DTask (e1, e2) => box [string "task",
                                space,
-                               p_exp env e]
+                               p_exp env e1,
+                               space,
+                               string "=",
+                               space,
+                               p_exp env e2]
 
 and p_str env (str, _) =
     case str of
diff --git a/src/elab_util.sml b/src/elab_util.sml
index 2a044e71..d0e140c5 100644
--- a/src/elab_util.sml
+++ b/src/elab_util.sml
@@ -854,7 +854,7 @@ fun mapfoldB {kind = fk, con = fc, exp = fe, sgn_item = fsgi, sgn = fsg, str = f
                                                                                 c), loc)))
                                                  | DStyle (tn, x, n) =>
                                                    bind (ctx, NamedE (x, (CModProj (n, [], "css_class"), loc)))
-                                                 | DInitializer _ => ctx,
+                                                 | DTask _ => ctx,
                                                mfd ctx d)) ctx ds,
                      fn ds' => (StrConst ds', loc))
               | StrVar _ => S.return2 strAll
@@ -979,10 +979,12 @@ fun mapfoldB {kind = fk, con = fc, exp = fe, sgn_item = fsgi, sgn = fsg, str = f
                         fn c' =>
                            (DCookie (tn, x, n, c'), loc))
               | DStyle _ => S.return2 dAll
-              | DInitializer e =>
-                S.map2 (mfe ctx e,
-                        fn e' =>
-                           (DInitializer e', loc))
+              | DTask (e1, e2) =>
+                S.bind2 (mfe ctx e1,
+                        fn e1' =>
+                           S.map2 (mfe ctx e2,
+                                fn e2' =>
+                                   (DTask (e1', e2'), loc)))
 
         and mfvi ctx (x, n, c, e) =
             S.bind2 (mfc ctx c,
@@ -1125,7 +1127,7 @@ and maxNameDecl (d, _) =
       | DDatabase _ => 0
       | DCookie (n1, _, n2, _) => Int.max (n1, n2)
       | DStyle (n1, _, n2) => Int.max (n1, n2)
-      | DInitializer _ => 0
+      | DTask _ => 0
 and maxNameStr (str, _) =
     case str of
         StrConst ds => maxName ds
diff --git a/src/elaborate.sml b/src/elaborate.sml
index d1b9648a..2a237c50 100644
--- a/src/elaborate.sml
+++ b/src/elaborate.sml
@@ -2548,7 +2548,7 @@ and sgiOfDecl (d, loc) =
       | L'.DDatabase _ => []
       | L'.DCookie (tn, x, n, c) => [(L'.SgiVal (x, n, (L'.CApp (cookieOf (), c), loc)), loc)]
       | L'.DStyle (tn, x, n) => [(L'.SgiVal (x, n, styleOf ()), loc)]
-      | L'.DInitializer _ => []
+      | L'.DTask _ => []
 
 and subSgn' counterparts env strLoc sgn1 (sgn2 as (_, loc2)) =
     ((*prefaces "subSgn" [("sgn1", p_sgn env sgn1),
@@ -3669,14 +3669,18 @@ and elabDecl (dAll as (d, loc), (env, denv, gs)) =
                 in
                     ([(L'.DStyle (!basis_r, x, n), loc)], (env, denv, gs))
                 end
-              | L.DInitializer e =>
+              | L.DTask (e1, e2) =>
                 let
-                    val (e', t, gs') = elabExp (env, denv) e
-                    val t' = (L'.CApp ((L'.CModProj (!basis_r, [], "transaction"), loc),
-                                       (L'.TRecord (L'.CRecord ((L'.KType, loc), []), loc), loc)), loc)
+                    val (e1', t1, gs1) = elabExp (env, denv) e1
+                    val (e2', t2, gs2) = elabExp (env, denv) e2
+
+                    val t1' = (L'.CModProj (!basis_r, [], "task_kind"), loc)
+                    val t2' = (L'.CApp ((L'.CModProj (!basis_r, [], "transaction"), loc),
+                                        (L'.TRecord (L'.CRecord ((L'.KType, loc), []), loc), loc)), loc)
                 in
-                    checkCon env e' t t';
-                    ([(L'.DInitializer e', loc)], (env, denv, gs' @ gs))
+                    checkCon env e1' t1 t1';
+                    checkCon env e2' t2 t2';
+                    ([(L'.DTask (e1', e2'), loc)], (env, denv, gs2 @ gs1 @ gs))
                 end
 
         (*val tcs = List.filter (fn TypeClass _ => true | _ => false) (#3 (#2 r))*)
diff --git a/src/elisp/urweb-defs.el b/src/elisp/urweb-defs.el
index bb0e257d..c697a274 100644
--- a/src/elisp/urweb-defs.el
+++ b/src/elisp/urweb-defs.el
@@ -108,7 +108,7 @@ notion of \"the end of an outline\".")
                  "datatype" "type" "open" "include"
                  urweb-module-head-syms
                  "con" "map" "where" "extern" "constraint" "constraints"
-                 "table" "sequence" "class" "cookie" "initializer")
+                 "table" "sequence" "class" "cookie" "task")
   "Symbols starting an sexp.")
 
 ;; (defconst urweb-not-arg-start-re
@@ -135,7 +135,7 @@ notion of \"the end of an outline\".")
      (("case" "datatype" "if" "then" "else"
        "let" "open" "sig" "struct" "type" "val"
        "con" "constraint" "table" "sequence" "class" "cookie"
-       "initializer")))))
+       "task")))))
 
 (defconst urweb-starters-indent-after
   (urweb-syms-re "let" "in" "struct" "sig")
@@ -190,7 +190,7 @@ for all symbols and in all lines starting with the given symbol."
 	  '("datatype" "fun"
 	    "open" "type" "val" "and"
 	    "con" "constraint" "table" "sequence" "class" "cookie"
-            "initializer"))
+            "task"))
   "The starters of new expressions.")
 
 (defconst urweb-exptrail-syms
diff --git a/src/elisp/urweb-mode.el b/src/elisp/urweb-mode.el
index ab274f22..107ea3bc 100644
--- a/src/elisp/urweb-mode.el
+++ b/src/elisp/urweb-mode.el
@@ -136,7 +136,7 @@ See doc for the variable `urweb-mode-info'."
 	       "datatype" "else" "end" "extern" "fn" "map"
 	       "fun" "functor" "if" "include"
 	       "of" "open" "let" "in"
-	       "rec" "sequence" "sig" "signature" "cookie" "style" "initializer"
+	       "rec" "sequence" "sig" "signature" "cookie" "style" "task"
 	       "struct" "structure" "table" "view" "then" "type" "val" "where"
 	       "with"
 
@@ -226,7 +226,7 @@ See doc for the variable `urweb-mode-info'."
     ("\\<\\(\\(data\\)?type\\|con\\|class\\)\\s-+\\(\\sw+\\)"
      (1 font-lock-keyword-face)
      (3 (amAttribute font-lock-type-def-face)))
-    ("\\<\\(val\\|table\\|sequence\\|cookie\\|style\\|initializer\\)\\s-+\\(\\sw+\\>\\s-*\\)?\\(\\sw+\\)\\s-*[=:]"
+    ("\\<\\(val\\|table\\|sequence\\|cookie\\|style\\|task\\)\\s-+\\(\\sw+\\>\\s-*\\)?\\(\\sw+\\)\\s-*[=:]"
      (1 font-lock-keyword-face)
      (3 (amAttribute font-lock-variable-name-face)))
     ("\\<\\(structure\\|functor\\)\\s-+\\(\\sw+\\)"
diff --git a/src/expl.sml b/src/expl.sml
index eb79e2b0..17797626 100644
--- a/src/expl.sml
+++ b/src/expl.sml
@@ -147,7 +147,7 @@ datatype decl' =
        | DDatabase of string
        | DCookie of int * string * int * con
        | DStyle of int * string * int
-       | DInitializer of exp
+       | DTask of exp * exp
 
      and str' =
          StrConst of decl list
diff --git a/src/expl_env.sml b/src/expl_env.sml
index f16eeb8e..0bf7323f 100644
--- a/src/expl_env.sml
+++ b/src/expl_env.sml
@@ -343,7 +343,7 @@ fun declBinds env (d, loc) =
         in
             pushENamed env x n t
         end
-      | DInitializer _ => env
+      | DTask _ => env
 
 fun sgiBinds env (sgi, loc) =
     case sgi of
diff --git a/src/expl_print.sml b/src/expl_print.sml
index 624afa63..5284eecb 100644
--- a/src/expl_print.sml
+++ b/src/expl_print.sml
@@ -713,9 +713,13 @@ fun p_decl env (dAll as (d, _) : decl) =
       | DStyle (_, x, n) => box [string "style",
                                  space,
                                  p_named x n]
-      | DInitializer e => box [string "initializer",
+      | DTask (e1, e2) => box [string "task",
                                space,
-                               p_exp env e]
+                               p_exp env e1,
+                               space,
+                               string "=",
+                               space,
+                               p_exp env e2]
 
 and p_str env (str, _) =
     case str of
diff --git a/src/explify.sml b/src/explify.sml
index d66b3530..aff91a34 100644
--- a/src/explify.sml
+++ b/src/explify.sml
@@ -195,7 +195,7 @@ fun explifyDecl (d, loc : EM.span) =
       | L.DDatabase s => SOME (L'.DDatabase s, loc)
       | L.DCookie (nt, x, n, c) => SOME (L'.DCookie (nt, x, n, explifyCon c), loc)
       | L.DStyle (nt, x, n) => SOME (L'.DStyle (nt, x, n), loc)
-      | L.DInitializer e => SOME (L'.DInitializer (explifyExp e), loc)
+      | L.DTask (e1, e2) => SOME (L'.DTask (explifyExp e1, explifyExp e2), loc)
 
 and explifyStr (str, loc) =
     case str of
diff --git a/src/mono.sml b/src/mono.sml
index 1962c6c5..e5e68bfa 100644
--- a/src/mono.sml
+++ b/src/mono.sml
@@ -139,7 +139,7 @@ datatype decl' =
        | DCookie of string
        | DStyle of string
 
-       | DInitializer of exp
+       | DTask of exp * exp
 
 withtype decl = decl' located
 
diff --git a/src/mono_env.sml b/src/mono_env.sml
index 6ffab153..c2e6cf02 100644
--- a/src/mono_env.sml
+++ b/src/mono_env.sml
@@ -129,7 +129,7 @@ fun declBinds env (d, loc) =
       | DJavaScript _ => env
       | DCookie _ => env
       | DStyle _ => env
-      | DInitializer _ => env
+      | DTask _ => env
 
 fun patBinds env (p, loc) =
     case p of
diff --git a/src/mono_print.sml b/src/mono_print.sml
index 13c45329..da34c220 100644
--- a/src/mono_print.sml
+++ b/src/mono_print.sml
@@ -491,9 +491,13 @@ fun p_decl env (dAll as (d, _) : decl) =
       | DStyle s => box [string "style",
                          space,
                          string s]
-      | DInitializer e => box [string "initializer",
+      | DTask (e1, e2) => box [string "task",
                                space,
-                               p_exp env e]
+                               p_exp env e1,
+                               space,
+                               string "=",
+                               space,
+                               p_exp env e2]
 
                           
 fun p_file env file =
diff --git a/src/mono_shake.sml b/src/mono_shake.sml
index fc46cf96..048cc190 100644
--- a/src/mono_shake.sml
+++ b/src/mono_shake.sml
@@ -57,7 +57,7 @@ fun shake file =
                 (fn ((DExport (_, _, n, _, _), _), (page_cs, page_es)) => (page_cs, IS.add (page_es, n))
                   | ((DDatabase {expunge = n1, initialize = n2, ...}, _), (page_cs, page_es)) =>
                     (page_cs, IS.addList (page_es, [n1, n2]))
-                  | ((DInitializer e, _), st) => usedVars st e
+                  | ((DTask (e1, e2), _), st) => usedVars (usedVars st e2) e1
                   | (_, st) => st) (IS.empty, IS.empty) file
 
         val (cdef, edef) = foldl (fn ((DDatatype dts, _), (cdef, edef)) =>
@@ -74,7 +74,7 @@ fun shake file =
                                    | ((DJavaScript _, _), acc) => acc
                                    | ((DCookie _, _), acc) => acc
                                    | ((DStyle _, _), acc) => acc
-                                   | ((DInitializer _, _), acc) => acc)
+                                   | ((DTask _, _), acc) => acc)
                                  (IM.empty, IM.empty) file
 
         fun typ (c, s) =
@@ -141,7 +141,7 @@ fun shake file =
                       | (DJavaScript _, _) => true
                       | (DCookie _, _) => true
                       | (DStyle _, _) => true
-                      | (DInitializer _, _) => true) file
+                      | (DTask _, _) => true) file
     end
 
 end
diff --git a/src/mono_util.sml b/src/mono_util.sml
index 184ce168..894e35d0 100644
--- a/src/mono_util.sml
+++ b/src/mono_util.sml
@@ -528,10 +528,12 @@ fun mapfoldB {typ = fc, exp = fe, decl = fd, bind} =
               | DJavaScript _ => S.return2 dAll
               | DCookie _ => S.return2 dAll
               | DStyle _ => S.return2 dAll
-              | DInitializer e =>
-                S.map2 (mfe ctx e,
-                     fn e' =>
-                        (DInitializer e', loc))
+              | DTask (e1, e2) =>
+                S.bind2 (mfe ctx e1,
+                     fn e1' =>
+                        S.map2 (mfe ctx e2,
+                             fn e2' =>
+                                (DTask (e1', e2'), loc)))
 
         and mfvi ctx (x, n, t, e, s) =
             S.bind2 (mft t,
@@ -618,7 +620,7 @@ fun mapfoldB (all as {bind, ...}) =
                                       | DJavaScript _ => ctx
                                       | DCookie _ => ctx
                                       | DStyle _ => ctx
-                                      | DInitializer _ => ctx
+                                      | DTask _ => ctx
                             in
                                 S.map2 (mff ctx' ds',
                                      fn ds' =>
@@ -672,7 +674,7 @@ val maxName = foldl (fn ((d, _) : decl, count) =>
                           | DJavaScript _ => count
                           | DCookie _ => count
                           | DStyle _ => count
-                          | DInitializer _ => count) 0
+                          | DTask _ => count) 0
 
 end
 
diff --git a/src/monoize.sml b/src/monoize.sml
index 503fd6b3..f6a56c33 100644
--- a/src/monoize.sml
+++ b/src/monoize.sml
@@ -3478,13 +3478,14 @@ fun monoDecl (env, fm) (all as (d, loc)) =
                       [(L'.DStyle s, loc),
                        (L'.DVal (x, n, t', e, s), loc)])
             end
-          | L.DInitializer e =>
+          | L.DTask (e1, e2) =>
             let
-                val (e, fm) = monoExp (env, St.empty, fm) e
+                val (e1, fm) = monoExp (env, St.empty, fm) e1
+                val (e2, fm) = monoExp (env, St.empty, fm) e2
             in
                 SOME (env,
                       fm,
-                      [(L'.DInitializer e, loc)])
+                      [(L'.DTask (e1, e2), loc)])
             end
     end
 
diff --git a/src/prepare.sml b/src/prepare.sml
index 7cbd7d76..2d144c67 100644
--- a/src/prepare.sml
+++ b/src/prepare.sml
@@ -325,11 +325,11 @@ fun prepDecl (d as (_, loc), st) =
       | DJavaScript _ => (d, st)
       | DCookie _ => (d, st)
       | DStyle _ => (d, st)
-      | DInitializer e =>
+      | DTask (tk, e) =>
         let
             val (e, st) = prepExp (e, st)
         in
-            ((DInitializer e, loc), st)
+            ((DTask (tk, e), loc), st)
         end
 
 fun prepare (ds, ps) =
diff --git a/src/reduce.sml b/src/reduce.sml
index cedb79fa..95b26da8 100644
--- a/src/reduce.sml
+++ b/src/reduce.sml
@@ -804,11 +804,12 @@ fun reduce file =
               | DDatabase _ => (d, st)
               | DCookie (s, n, c, s') => ((DCookie (s, n, con namedC [] c, s'), loc), st)
               | DStyle (s, n, s') => ((DStyle (s, n, s'), loc), st)
-              | DInitializer e =>
+              | DTask (e1, e2) =>
                 let
-                    val e = exp (namedC, namedE) [] e
+                    val e1 = exp (namedC, namedE) [] e1
+                    val e2 = exp (namedC, namedE) [] e2
                 in
-                    ((DInitializer e, loc),
+                    ((DTask (e1, e2), loc),
                      (polyC,
                       namedC,
                       namedE))
diff --git a/src/reduce_local.sml b/src/reduce_local.sml
index 82490118..b040a1ec 100644
--- a/src/reduce_local.sml
+++ b/src/reduce_local.sml
@@ -251,7 +251,7 @@ fun reduce file =
               | DDatabase _ => d
               | DCookie _ => d
               | DStyle _ => d
-              | DInitializer e => (DInitializer (exp [] e), loc)
+              | DTask (e1, e2) => (DTask (exp [] e1, exp [] e2), loc)
     in
         map doDecl file
     end
diff --git a/src/shake.sml b/src/shake.sml
index 787500ea..d1810bea 100644
--- a/src/shake.sml
+++ b/src/shake.sml
@@ -79,7 +79,7 @@ fun shake file =
                     in
                         (usedE, usedC)
                     end
-                  | ((DInitializer e, _), st) => usedVars st e
+                  | ((DTask (e1, e2), _), st) => usedVars (usedVars st e1) e2
                   | (_, acc) => acc) (IS.empty, IS.empty) file
 
         val (cdef, edef) = foldl (fn ((DCon (_, n, _, c), _), (cdef, edef)) => (IM.insert (cdef, n, [c]), edef)
@@ -106,7 +106,7 @@ fun shake file =
                                      (cdef, IM.insert (edef, n, ([], c, dummye)))
                                    | ((DStyle (_, n, _), _), (cdef, edef)) =>
                                      (cdef, IM.insert (edef, n, ([], dummyt, dummye)))
-                                   | ((DInitializer _, _), acc) => acc)
+                                   | ((DTask _, _), acc) => acc)
                                  (IM.empty, IM.empty) file
 
         fun kind (_, s) = s
@@ -186,7 +186,7 @@ fun shake file =
                       | (DDatabase _, _) => true
                       | (DCookie _, _) => true
                       | (DStyle _, _) => true
-                      | (DInitializer _, _) => true) file
+                      | (DTask _, _) => true) file
     end
 
 end
diff --git a/src/source.sml b/src/source.sml
index e52872f0..dc867026 100644
--- a/src/source.sml
+++ b/src/source.sml
@@ -167,7 +167,7 @@ datatype decl' =
        | DDatabase of string
        | DCookie of string * con
        | DStyle of string
-       | DInitializer of exp
+       | DTask of exp * exp
 
      and str' =
          StrConst of decl list
diff --git a/src/source_print.sml b/src/source_print.sml
index 31fc2500..e3b4fe94 100644
--- a/src/source_print.sml
+++ b/src/source_print.sml
@@ -662,9 +662,13 @@ fun p_decl ((d, _) : decl) =
       | DStyle x => box [string "style",
                          space,
                          string x]
-      | DInitializer e => box [string "initializer",
+      | DTask (e1, e2) => box [string "task",
                                space,
-                               p_exp e]
+                               p_exp e1,
+                               space,
+                               string "=",
+                               space,
+                               p_exp e2]
 
 and p_str (str, _) =
     case str of
diff --git a/src/unnest.sml b/src/unnest.sml
index c4d9a8b5..e030bbc6 100644
--- a/src/unnest.sml
+++ b/src/unnest.sml
@@ -422,7 +422,7 @@ fun unnest file =
                   | DDatabase _ => default ()
                   | DCookie _ => default ()
                   | DStyle _ => default ()
-                  | DInitializer _ => explore ()
+                  | DTask _ => explore ()
             end
 
         and doStr (all as (str, loc), st) =
diff --git a/src/urweb.grm b/src/urweb.grm
index 8780d9f6..afe7be07 100644
--- a/src/urweb.grm
+++ b/src/urweb.grm
@@ -201,7 +201,7 @@ fun patType loc (p : pat) =
  | LET | IN
  | STRUCTURE | SIGNATURE | STRUCT | SIG | END | FUNCTOR | WHERE | EXTERN | SQL | SELECT1
  | INCLUDE | OPEN | CONSTRAINT | CONSTRAINTS | EXPORT | TABLE | SEQUENCE | VIEW
- | COOKIE | STYLE | INITIALIZER
+ | COOKIE | STYLE | TASK
  | CASE | IF | THEN | ELSE | ANDALSO | ORELSE
 
  | XML_BEGIN of string | XML_END | XML_BEGIN_END of string
@@ -479,7 +479,7 @@ decl   : CON SYMBOL cargl2 kopt EQ cexp (let
                                          end)
        | COOKIE SYMBOL COLON cexp       ([(DCookie (SYMBOL, cexp), s (COOKIEleft, cexpright))])
        | STYLE SYMBOL                   ([(DStyle SYMBOL, s (STYLEleft, SYMBOLright))])
-       | INITIALIZER eexp               ([(DInitializer eexp, s (INITIALIZERleft, eexpright))])
+       | TASK eapps EQ eexp             ([(DTask (eapps, eexp), s (TASKleft, eexpright))])
 
 dtype  : SYMBOL dargs EQ barOpt dcons   (SYMBOL, dargs, dcons)
 
diff --git a/src/urweb.lex b/src/urweb.lex
index d04822f7..5fb767b1 100644
--- a/src/urweb.lex
+++ b/src/urweb.lex
@@ -402,7 +402,7 @@ notags = [^<{\n]+;
 <INITIAL> "class"     => (Tokens.CLASS (pos yypos, pos yypos + size yytext));
 <INITIAL> "cookie"    => (Tokens.COOKIE (pos yypos, pos yypos + size yytext));
 <INITIAL> "style"     => (Tokens.STYLE (pos yypos, pos yypos + size yytext));
-<INITIAL> "initializer" => (Tokens.INITIALIZER (pos yypos, pos yypos + size yytext));
+<INITIAL> "task"      => (Tokens.TASK (pos yypos, pos yypos + size yytext));
 
 <INITIAL> "Type"      => (Tokens.TYPE (pos yypos, pos yypos + size yytext));
 <INITIAL> "Name"      => (Tokens.NAME (pos yypos, pos yypos + size yytext));