Support for list recombinations

The primary use-case for this was to be able to run computations on a list of structures, then return an updated list with some fields in the structures modified : that is what we need for distribution of tax amounts among household members, for example. This patch has a few components: - Addition of a test as an example for tax distributions - Added a transformation, performed during desugaring, that -- where lists are syntactically expected, i.e. after the `among` keyword -- turns a (syntactic) tuple of lists into a list of tuples ("zipping" the lists) - Arg-extremum transformation was also fixed to use an intermediate list instead of computing the predicate twice - For convenience, allow to bind multiple variables in most* list operations (previously only `let in` and functions allowed it) - Fixed the printer for tuples to differentiate them from lists *Note: tuples are not yet allowed on the left-hand side of filters and arg-extremums for annoying syntax conflict reasons.
2024-09-19 00:15:39 +03:00 · 2024-01-25 17:37:00 +01:00 · 2024-01-25 17:37:00 +01:00 · 371f9554b8
commit 371f9554b8
parent 13bc62a561
13 changed files with 359 additions and 90 deletions
--- a/compiler/desugared/from_surface.ml
+++ b/compiler/desugared/from_surface.ml
@ -226,6 +226,40 @@ let rec translate_expr
  let rec_helper ?(local_vars = local_vars) e =
    translate_expr scope inside_definition_of ctxt local_vars e
  in
+  let rec detuplify_list = function
+    (* Where a list is expected (e.g. after [among]), as syntactic sugar, if a
+       tuple is found instead we transpose it into a list of tuples *)
+    | S.Tuple ls, pos ->
+      let m = Untyped { pos } in
+      let ls = List.map detuplify_list ls in
+      let rec zip = function
+        | [] -> assert false
+        | [l] -> l
+        | l1 :: r ->
+          let rhs = zip r in
+          let rtys, explode =
+            match List.length r with
+            | 1 -> (TAny, pos), fun e -> [e]
+            | size ->
+              ( (TTuple (List.map (fun _ -> TAny, pos) r), pos),
+                fun e ->
+                  List.init size (fun index ->
+                      Expr.etupleaccess ~e ~size ~index m) )
+          in
+          let tys = [TAny, pos; rtys] in
+          let f_join =
+            let x1 = Var.make "x1" and x2 = Var.make "x2" in
+            Expr.make_abs [| x1; x2 |]
+              (Expr.make_tuple (Expr.evar x1 m :: explode (Expr.evar x2 m)) m)
+              tys pos
+          in
+          Expr.eappop ~op:Map2 ~args:[f_join; l1; rhs]
+            ~tys:((TAny, pos) :: List.map (fun ty -> TArray ty, pos) tys)
+            m
+      in
+      zip ls
+    | e -> rec_helper e
+  in
  let pos = Mark.get expr in
  let emark = Untyped { pos } in
  match Mark.remove expr with
@ -629,16 +663,39 @@ let rec translate_expr
  | ArrayLit es -> Expr.earray (List.map rec_helper es) emark
  | Tuple es -> Expr.etuple (List.map rec_helper es) emark
  | CollectionOp (((S.Filter { f } | S.Map { f }) as op), collection) ->
-    let collection = rec_helper collection in
-    let param_name, predicate = f in
-    let param = Var.make (Mark.remove param_name) in
-    let local_vars = Ident.Map.add (Mark.remove param_name) param local_vars in
+    let collection = detuplify_list collection in
+    let param_names, predicate = f in
+    let params = List.map (fun n -> Var.make (Mark.remove n)) param_names in
+    let local_vars =
+      List.fold_left2
+        (fun vars n p -> Ident.Map.add (Mark.remove n) p vars)
+        local_vars param_names params
+    in
    let f_pred =
-      Expr.make_abs [| param |]
+      Expr.make_abs (Array.of_list params)
        (rec_helper ~local_vars predicate)
-        [TAny, pos]
+        (List.map (fun _ -> TAny, pos) params)
        pos
    in
+    let f_pred =
+      (* Detuplification (TODO: check if we couldn't fit this in the general
+         detuplification later) *)
+      match List.length param_names with
+      | 1 -> f_pred
+      | nb_args ->
+        let v =
+          Var.make (String.concat "_" (List.map Mark.remove param_names))
+        in
+        let x = Expr.evar v emark in
+        let tys = List.map (fun _ -> TAny, pos) param_names in
+        Expr.make_abs [| v |]
+          (Expr.make_app f_pred
+             (List.init nb_args (fun i ->
+                  Expr.etupleaccess ~e:x ~index:i ~size:nb_args emark))
+             tys pos)
+          [TAny, pos]
+          pos
+    in
    Expr.eappop
      ~op:
        (match op with
@ -648,49 +705,69 @@ let rec translate_expr
      ~tys:[TAny, pos; TAny, pos]
      ~args:[f_pred; collection] emark
  | CollectionOp
-      ( S.AggregateArgExtremum { max; default; f = param_name, predicate },
+      ( S.AggregateArgExtremum { max; default; f = param_names, predicate },
        collection ) ->
    let default = rec_helper default in
    let pos_dft = Expr.pos default in
-    let collection = rec_helper collection in
-    let param = Var.make (Mark.remove param_name) in
-    let local_vars = Ident.Map.add (Mark.remove param_name) param local_vars in
+    let collection = detuplify_list collection in
+    let params = List.map (fun n -> Var.make (Mark.remove n)) param_names in
+    let local_vars =
+      List.fold_left2
+        (fun vars n p -> Ident.Map.add (Mark.remove n) p vars)
+        local_vars param_names params
+    in
    let cmp_op = if max then Op.Gt else Op.Lt in
    let f_pred =
-      Expr.make_abs [| param |]
+      Expr.make_abs (Array.of_list params)
        (rec_helper ~local_vars predicate)
        [TAny, pos]
        pos
    in
-    let param_name = Bindlib.name_of param in
-    let v1, v2 = Var.make (param_name ^ "_1"), Var.make (param_name ^ "_2") in
-    let x1 = Expr.make_var v1 emark in
-    let x2 = Expr.make_var v2 emark in
+    let add_weight_f =
+      let vs = List.map (fun p -> Var.make (Bindlib.name_of p)) params in
+      let xs = List.map (fun v -> Expr.evar v emark) vs in
+      let x = match xs with [x] -> x | xs -> Expr.etuple xs emark in
+      Expr.make_abs (Array.of_list vs)
+        (Expr.make_tuple [x; Expr.eapp ~f:f_pred ~args:xs ~tys:[] emark] emark)
+        [TAny, pos]
+        pos
+    in
    let reduce_f =
-      (* fun x1 x2 -> cmp_op (pred x1) (pred x2) *)
-      (* Note: this computes f_pred twice on every element, but we'd rather not
-         rely on returning tuples here *)
+      (* fun x1 x2 -> if cmp_op (x1.2) (x2.2) cmp *)
+      let v1, v2 = Var.make "x1", Var.make "x2" in
+      let x1, x2 = Expr.make_var v1 emark, Expr.make_var v2 emark in
      Expr.make_abs [| v1; v2 |]
        (Expr.eifthenelse
           (Expr.eappop ~op:cmp_op
              ~tys:[TAny, pos_dft; TAny, pos_dft]
              ~args:
                [
-                  Expr.eapp ~f:f_pred ~args:[x1] ~tys:[] emark;
-                  Expr.eapp ~f:f_pred ~args:[x2] ~tys:[] emark;
+                  Expr.etupleaccess ~e:x1 ~index:1 ~size:2 emark;
+                  Expr.etupleaccess ~e:x2 ~index:1 ~size:2 emark;
                ]
              emark)
           x1 x2 emark)
        [TAny, pos; TAny, pos]
        pos
    in
-    Expr.eappop ~op:Reduce
-      ~tys:[TAny, pos; TAny, pos; TAny, pos]
-      ~args:[reduce_f; default; collection]
-      emark
+    let weights_var = Var.make "weights" in
+    let default = Expr.make_app add_weight_f [default] [TAny, pos] pos_dft in
+    let weighted_result =
+      Expr.make_let_in weights_var
+        (TArray (TTuple [TAny, pos; TAny, pos], pos), pos)
+        (Expr.eappop ~op:Map
+           ~tys:[TAny, pos; TArray (TAny, pos), pos]
+           ~args:[add_weight_f; collection] emark)
+        (Expr.eappop ~op:Reduce
+           ~tys:[TAny, pos; TAny, pos; TAny, pos]
+           ~args:[reduce_f; default; Expr.evar weights_var emark]
+           emark)
+        pos
+    in
+    Expr.etupleaccess ~e:weighted_result ~index:0 ~size:2 emark
  | CollectionOp
      (((Exists { predicate } | Forall { predicate }) as op), collection) ->
-    let collection = rec_helper collection in
+    let collection = detuplify_list collection in
    let init, op =
      match op with
      | Exists _ -> false, S.Or
@ -698,14 +775,21 @@ let rec translate_expr
      | _ -> assert false
    in
    let init = Expr.elit (LBool init) emark in
-    let param0, predicate = predicate in
-    let param = Var.make (Mark.remove param0) in
-    let local_vars = Ident.Map.add (Mark.remove param0) param local_vars in
+    let params0, predicate = predicate in
+    let params = List.map (fun n -> Var.make (Mark.remove n)) params0 in
+    let local_vars =
+      List.fold_left2
+        (fun vars n p -> Ident.Map.add (Mark.remove n) p vars)
+        local_vars params0 params
+    in
    let f =
      let acc_var = Var.make "acc" in
-      let acc = Expr.make_var acc_var (Untyped { pos = Mark.get param0 }) in
+      let acc =
+        Expr.make_var acc_var (Untyped { pos = Mark.get (List.hd params0) })
+      in
      Expr.eabs
-        (Expr.bind [| acc_var; param |]
+        (Expr.bind
+           (Array.of_list (acc_var :: params))
           (translate_binop (op, pos) pos acc
              (rec_helper ~local_vars predicate)))
        [TAny, pos; TAny, pos]
@ -766,7 +850,7 @@ let rec translate_expr
  | MemCollection (member, collection) ->
    let param_var = Var.make "collection_member" in
    let param = Expr.make_var param_var emark in
-    let collection = rec_helper collection in
+    let collection = detuplify_list collection in
    let init = Expr.elit (LBool false) emark in
    let acc_var = Var.make "acc" in
    let acc = Expr.make_var acc_var emark in
--- a/compiler/shared_ast/interpreter.ml
+++ b/compiler/shared_ast/interpreter.ml
@ -204,7 +204,15 @@ let rec evaluate_operator
         (fun e1 e2 ->
           evaluate_expr
             (Mark.add m
-                (EApp { f; args = [e1; e2]; tys = [Expr.maybe_ty (Mark.get e1); Expr.maybe_ty (Mark.get e2)] })))
+                (EApp
+                   {
+                     f;
+                     args = [e1; e2];
+                     tys =
+                       [
+                         Expr.maybe_ty (Mark.get e1); Expr.maybe_ty (Mark.get e2);
+                       ];
+                   })))
         es1 es2)
  | Reduce, [_; default; (EArray [], _)] -> Mark.remove default
  | Reduce, [f; _; (EArray (x0 :: xn), _)] ->
@ -257,7 +265,8 @@ let rec evaluate_operator
                       ];
                   })))
         init es)
-  | (Length | Log _ | Eq | Map | Map2 | Concat | Filter | Fold | Reduce), _ -> err ()
+  | (Length | Log _ | Eq | Map | Map2 | Concat | Filter | Fold | Reduce), _ ->
+    err ()
  | Not, [(ELit (LBool b), _)] -> ELit (LBool (o_not b))
  | GetDay, [(ELit (LDate d), _)] -> ELit (LInt (o_getDay d))
  | GetMonth, [(ELit (LDate d), _)] -> ELit (LInt (o_getMonth d))
--- a/compiler/shared_ast/operator.ml
+++ b/compiler/shared_ast/operator.ml
@ -374,8 +374,8 @@ type 'a no_overloads =
 let translate (t : 'a no_overloads t) : 'b no_overloads t =
  match t with
  | ( Not | GetDay | GetMonth | GetYear | FirstDayOfMonth | LastDayOfMonth | And
-    | Or | Xor | HandleDefault | HandleDefaultOpt | Log _ | Length | Eq | Map | Map2
-    | Concat | Filter | Reduce | Fold | Minus_int | Minus_rat | Minus_mon
+    | Or | Xor | HandleDefault | HandleDefaultOpt | Log _ | Length | Eq | Map
+    | Map2 | Concat | Filter | Reduce | Fold | Minus_int | Minus_rat | Minus_mon
    | Minus_dur | ToRat_int | ToRat_mon | ToMoney_rat | Round_rat | Round_mon
    | Add_int_int | Add_rat_rat | Add_mon_mon | Add_dat_dur _ | Add_dur_dur
    | Sub_int_int | Sub_rat_rat | Sub_mon_mon | Sub_dat_dat | Sub_dat_dur
--- a/compiler/shared_ast/print.ml
+++ b/compiler/shared_ast/print.ml
@ -409,8 +409,8 @@ module Precedence = struct
      | Div | Div_int_int | Div_rat_rat | Div_mon_rat | Div_mon_mon
      | Div_dur_dur ->
        Op Div
-      | HandleDefault | HandleDefaultOpt | Map | Map2 | Concat | Filter | Reduce | Fold
-      | ToClosureEnv | FromClosureEnv ->
+      | HandleDefault | HandleDefaultOpt | Map | Map2 | Concat | Filter | Reduce
+      | Fold | ToClosureEnv | FromClosureEnv ->
        App)
    | EApp _ -> App
    | EArray _ -> Contained
@ -1090,12 +1090,18 @@ module UserFacing = struct
       ppf e ->
    match Mark.remove e with
    | ELit l -> lit lang ppf l
-    | EArray l | ETuple l ->
+    | EArray l ->
      Format.fprintf ppf "@[<hv 2>[@,@[<hov>%a@]@;<0 -2>]@]"
        (Format.pp_print_list
           ~pp_sep:(fun ppf () -> Format.fprintf ppf ";@ ")
           (value ~fallback lang))
        l
+    | ETuple l ->
+      Format.fprintf ppf "@[<hv 2>(@,@[<hov>%a@]@;<0 -2>)@]"
+        (Format.pp_print_list
+           ~pp_sep:(fun ppf () -> Format.fprintf ppf ",@ ")
+           (value ~fallback lang))
+        l
    | EStruct { name; fields } ->
      Format.fprintf ppf "@[<hv 2>%a {@ %a@;<1 -2>}@]" StructName.format name
        (StructField.Map.format_bindings ~pp_sep:Format.pp_print_space
--- a/compiler/shared_ast/typing.ml
+++ b/compiler/shared_ast/typing.ml
@ -755,9 +755,9 @@ and typecheck_expr_top_down :
  | A.EAbs { binder; tys = t_args } ->
    if Bindlib.mbinder_arity binder <> List.length t_args then
      Message.raise_spanned_error (Expr.pos e)
-        "function has %d variables but was supplied %d types"
+        "function has %d variables but was supplied %d types\n%a"
        (Bindlib.mbinder_arity binder)
-        (List.length t_args)
+        (List.length t_args) Expr.format e
    else
      let tau_args = List.map ast_to_typ t_args in
      let t_ret = unionfind (TAny (Any.fresh ())) in
--- a/compiler/surface/ast.ml
+++ b/compiler/surface/ast.ml
@ -145,10 +145,10 @@ and literal =
  | LDate of literal_date

 and collection_op =
-  | Exists of { predicate : lident Mark.pos * expression }
-  | Forall of { predicate : lident Mark.pos * expression }
-  | Map of { f : lident Mark.pos * expression }
-  | Filter of { f : lident Mark.pos * expression }
+  | Exists of { predicate : lident Mark.pos list * expression }
+  | Forall of { predicate : lident Mark.pos list * expression }
+  | Map of { f : lident Mark.pos list * expression }
+  | Filter of { f : lident Mark.pos list * expression }
  | AggregateSum of { typ : primitive_typ }
  (* it would be nice to remove the need for specifying the and here like for
     extremums, but we need an additionl overload for "neutral element for
@ -157,7 +157,7 @@ and collection_op =
  | AggregateArgExtremum of {
      max : bool;
      default : expression;
-      f : lident Mark.pos * expression;
+      f : lident Mark.pos list * expression;
    }

 and explicit_match_case = {
--- a/compiler/surface/parser.mly
+++ b/compiler/surface/parser.mly
@ -157,6 +157,10 @@ let qlident :=
 }
 | id = lident ; { [], id }

+let mbinder ==
+| id = lident ; { [id] }
+| LPAREN ; ids = separated_nonempty_list(COMMA,lident) ; RPAREN ; <>
+
 let expression :=
 | e = addpos(naked_expression) ; <>

@ -216,7 +220,7 @@ let naked_expression ==
  CollectionOp (AggregateSum { typ = Mark.remove typ }, coll)
 } %prec apply
 | f = expression ;
-  FOR ; i = lident ;
+  FOR ; i = mbinder ;
  AMONG ; coll = expression ; {
  CollectionOp (Map {f = i, f}, coll)
 } %prec apply
@ -234,12 +238,12 @@ let naked_expression ==
  e2 = expression ; {
  Binop (binop, e1, e2)
 }
-| EXISTS ; i = lident ;
+| EXISTS ; i = mbinder ;
  AMONG ; coll = expression ;
  SUCH ; THAT ; predicate = expression ; {
  CollectionOp (Exists {predicate = i, predicate}, coll)
 } %prec let_expr
-| FOR ; ALL ; i = lident ;
+| FOR ; ALL ; i = mbinder ;
  AMONG ; coll = expression ;
  WE_HAVE ; predicate = expression ; {
  CollectionOp (Forall {predicate = i, predicate}, coll)
@ -254,28 +258,28 @@ let naked_expression ==
  ELSE ; e3 = expression ; {
  IfThenElse (e1, e2, e3)
 } %prec let_expr
-| LET ; ids = separated_nonempty_list(COMMA,lident) ;
+| LET ; ids = mbinder ;
  DEFINED_AS ; e1 = expression ;
  IN ; e2 = expression ; {
  LetIn (ids, e1, e2)
 } %prec let_expr
-| i = lident ;
+| i = lident ; (* FIXME: should be mbinder *)
  AMONG ; coll = expression ;
  SUCH ; THAT ; f = expression ; {
-  CollectionOp (Filter {f = i, f}, coll)
+  CollectionOp (Filter {f = [i], f}, coll)
 } %prec top_expr
 | fmap = expression ;
-  FOR ; i = lident ;
+  FOR ; i = mbinder ;
  AMONG ; coll = expression ;
  SUCH ; THAT ; ffilt = expression ; {
  CollectionOp (Map {f = i, fmap}, (CollectionOp (Filter {f = i, ffilt}, coll), Pos.from_lpos $loc))
 } %prec top_expr
-| i = lident ;
+| i = lident ; (* FIXME: should be mbinder *)
  AMONG ; coll = expression ;
  SUCH ; THAT ; f = expression ;
  IS ; max = minmax ;
  OR ; IF ; LIST_EMPTY ; THEN ; default = expression ; {
-  CollectionOp (AggregateArgExtremum { max; default; f = i, f }, coll)
+  CollectionOp (AggregateArgExtremum { max; default; f = [i], f }, coll)
 } %prec top_expr


--- a/runtimes/ocaml/runtime.ml
+++ b/runtimes/ocaml/runtime.ml
@ -661,7 +661,9 @@ module Oper = struct
  let o_xor : bool -> bool -> bool = ( <> )
  let o_eq = ( = )
  let o_map = Array.map
-  let o_map2 f a b = try Array.map2 f a b with Invalid_argument _ -> raise NotSameLength
+
+  let o_map2 f a b =
+    try Array.map2 f a b with Invalid_argument _ -> raise NotSameLength

  let o_reduce f dft a =
    let len = Array.length a in
--- a/tests/test_array/good/aggregation_3.catala_en
+++ b/tests/test_array/good/aggregation_3.catala_en
@ -72,18 +72,19 @@ let scope S (x: integer|internal|output) =
            10.
            map (λ (i: integer) → to_rat i) [1; 2; 3])
         = 3.;
-  assert (reduce
-            (λ (i_1: integer) (i_2: integer) →
-             if
-               (let i : integer = i_1 in
-                to_rat ((2 - i) * (2 - i)))
-               < let i : integer = i_2 in
-                 to_rat ((2 - i) * (2 - i))
-             then
-               i_1
-             else i_2)
-            42
-            [1; 2; 3])
+  assert (let weights : list of (integer * decimal) =
+            map (λ (i: integer) →
+                 (i, let i1 : integer = i in
+                     to_rat ((2 - i1) * (2 - i1))))
+              [1; 2; 3]
+          in
+          reduce
+            (λ (x1: (integer * decimal)) (x2: (integer * decimal)) →
+             if x1.1 < x2.1 then x1 else x2)
+            let i : integer = 42 in
+            (i, let i1 : integer = i in
+                to_rat ((2 - i1) * (2 - i1)))
+            weights).0
         = 2
 ```

--- a/tests/test_func/good/closure_conversion_reduce.catala_en
+++ b/tests/test_func/good/closure_conversion_reduce.catala_en
@ -24,12 +24,12 @@ $ catala Lcalc -s S --avoid-exceptions -O --closure-conversion
 let scope S (S_in: S_in {x_in: list of integer}): S {y: integer} =
  let get x : list of integer = S_in.x_in in
  let set y : integer =
-    reduce
-      (λ (potential_max_1: integer) (potential_max_2: integer) →
-       if potential_max_1 < potential_max_2 then potential_max_1
-       else potential_max_2)
-      -1
-      x
+    (reduce
+       (λ (x1: (integer * integer)) (x2: (integer * integer)) →
+        if x1.1 < x2.1 then x1 else x2)
+       let potential_max : integer = -1 in
+       (potential_max, potential_max)
+       map (λ (potential_max: integer) → (potential_max, potential_max)) x).0
  in
  return { S y = y; }
 ```
@ -57,18 +57,21 @@ let scope S (S_in: S_in {x_in: list of integer}): S {y: integer} =
             (λ (_: unit) → true)
             (λ (_: unit) →
              ESome
-                (reduce
-                   (λ (potential_max_1: integer) (potential_max_2: integer) →
-                    if
-                      (let potential_max : integer = potential_max_1 in
-                       potential_max)
-                      < let potential_max : integer = potential_max_2 in
-                        potential_max
-                    then
-                      potential_max_1
-                    else potential_max_2)
-                   -1
-                   x))
+                (let weights : list of (integer * integer) =
+                   map (λ (potential_max: integer) →
+                        (potential_max,
+                          let potential_max1 : integer = potential_max in
+                          potential_max1))
+                     x
+                 in
+                 reduce
+                   (λ (x1: (integer * integer)) (x2: (integer * integer)) →
+                    if x1.1 < x2.1 then x1 else x2)
+                   let potential_max : integer = -1 in
+                   (potential_max,
+                     let potential_max1 : integer = potential_max in
+                     potential_max1)
+                   weights).0)
         ]
         (λ (_: unit) → false)
         (λ (_: unit) → ENone ()))
--- a/tests/test_modules/good/prorata_syntax.catala_en
+++ b/tests/test_modules/good/prorata_syntax.catala_en
@ -0,0 +1,65 @@
+> Using Prorata_external as Ext
+
+
+```catala
+declaration structure HouseholdMember:
+  data birthdate content date
+  data revenue content money
+
+declaration structure HouseholdMemberTaxed:
+  data member content HouseholdMember
+  data tax content money
+
+declaration individual_tax_amount content list of HouseholdMemberTaxed
+  depends on members content list of HouseholdMember,
+             tax_to_distribute content money
+  equals
+  let revenues equals member.revenue for member among members in
+  let distributed_tax equals Ext.prorata of tax_to_distribute, revenues in
+  HouseholdMemberTaxed {
+    -- member: member
+    -- tax: tax_amount
+  }
+  for (member, tax_amount) among (members, distributed_tax)
+
+declaration scope S:
+  output result content list of HouseholdMemberTaxed
+
+scope S:
+  definition result equals
+  individual_tax_amount of
+    [ HouseholdMember { -- birthdate: |2000-01-01| -- revenue: $10000 };
+      HouseholdMember { -- birthdate: |2000-01-02| -- revenue: $1000 };
+      HouseholdMember { -- birthdate: |2000-01-02| -- revenue: $100 } ],
+    $300
+```
+
+```catala-test-inline
+$ catala typecheck --check-invariants
+[RESULT] All invariant checks passed
+[RESULT] Typechecking successful!
+```
+
+```catala-test-inline
+$ catala interpret -s S
+[RESULT] Computation successful! Results:
+[RESULT]
+result =
+  [
+    HouseholdMemberTaxed {
+      -- member:
+        HouseholdMember { -- birthdate: 2000-01-01 -- revenue: $10,000.00 }
+      -- tax: $270.27
+    };
+    HouseholdMemberTaxed {
+      -- member:
+        HouseholdMember { -- birthdate: 2000-01-02 -- revenue: $1,000.00 }
+      -- tax: $27.03
+    };
+    HouseholdMemberTaxed {
+      -- member:
+        HouseholdMember { -- birthdate: 2000-01-02 -- revenue: $100.00 }
+      -- tax: $2.70
+    }
+  ]
+```
--- a/tests/test_tuples/good/tuples.catala_en
+++ b/tests/test_tuples/good/tuples.catala_en
@ -16,11 +16,11 @@ declaration f2 content decimal
  equals
  match en with pattern
  -- One of str1:
-     let a, w equals str.x1 in
-     let b, w equals str1.x1 in
+     let (a, w) equals str.x1 in
+     let (b, w) equals str1.x1 in
     a / b
  -- Two of z:
-     let z1, z2 equals z in z1 / 2
+     let (z1, z2) equals z in z1 / 2

 declaration scope Test:
  output o content (date, decimal)
@ -40,11 +40,11 @@ $ catala typecheck --check-invariants
 ```catala-test-inline
 $ catala interpret -s Test
 [RESULT] Computation successful! Results:
-[RESULT] o = [2001-01-03; 6.0]
+[RESULT] o = (2001-01-03, 6.0)
 ```

 ```catala-test-inline
 $ catala interpret_lcalc -s Test
 [RESULT] Computation successful! Results:
-[RESULT] o = [2001-01-03; 6.0]
+[RESULT] o = (2001-01-03, 6.0)
 ```
--- a/tests/test_tuples/good/tuplists.catala_en
+++ b/tests/test_tuples/good/tuplists.catala_en
@ -0,0 +1,95 @@
+
+```catala
+
+declaration lis1 content list of decimal equals
+  [ 12.; 13.; 14.; 15.; 16.; 17. ]
+
+declaration lis2 content list of money equals
+  [ $10; $1; $100; $42; $17; $10 ]
+
+declaration lis3 content list of money equals
+  [ $20; $200; $10; $23; $25; $12 ]
+
+declaration tlist content list of (decimal, money, money) equals
+  (a, b, c) for (a, b, c) among (lis1, lis2, lis3)
+
+declaration grok
+  content (money, decimal)
+  depends on dec content decimal,
+             mon1 content money,
+             mon2 content money
+  equals
+  (mon1 * dec, mon1 / mon2)
+
+declaration scope S:
+  output r1 content list of (money, decimal)
+  output r2 content list of (money, decimal)
+  output r3 content list of (money, decimal)
+  output r4 content list of (money, decimal)
+  output r5 content list of (money, decimal)
+  output r6 content list of (money, decimal)
+
+scope S:
+  definition r1 equals (grok of x) for x among tlist
+  definition r2 equals (grok of x) for x among (lis1, lis2, lis3)
+  definition r3 equals (grok of (x, y, z)) for (x, y, z) among (lis1, lis2, lis3)
+  definition r4 equals (x * y, y / z) for (x, y, z) among tlist
+  definition r5 equals (x * y, y / z) for (x, y, z) among (lis1, lis2, lis3)
+  definition r6 equals
+    let lis12 equals (x, y) for (x, y) among (lis1, lis2) in
+    (let (x, y) equals xy in (x * y, y / z))
+      for (xy, z) among (lis12, lis3)
+
+```
+
+```catala-test-inline
+$ catala typecheck
+[RESULT] Typechecking successful!
+```
+
+```catala-test-inline
+$ catala interpret -s S
+[RESULT] Computation successful! Results:
+[RESULT]
+r1 =
+  [
+    ($120.00, 0.5); ($13.00, 0.005); ($1,400.00, 10.0);
+    ($630.00, 1.826,086,956,521,739,130,4…); ($272.00, 0.68);
+    ($170.00, 0.833,333,333,333,333,333,33…)
+  ]
+[RESULT]
+r2 =
+  [
+    ($120.00, 0.5); ($13.00, 0.005); ($1,400.00, 10.0);
+    ($630.00, 1.826,086,956,521,739,130,4…); ($272.00, 0.68);
+    ($170.00, 0.833,333,333,333,333,333,33…)
+  ]
+[RESULT]
+r3 =
+  [
+    ($120.00, 0.5); ($13.00, 0.005); ($1,400.00, 10.0);
+    ($630.00, 1.826,086,956,521,739,130,4…); ($272.00, 0.68);
+    ($170.00, 0.833,333,333,333,333,333,33…)
+  ]
+[RESULT]
+r4 =
+  [
+    ($120.00, 0.5); ($13.00, 0.005); ($1,400.00, 10.0);
+    ($630.00, 1.826,086,956,521,739,130,4…); ($272.00, 0.68);
+    ($170.00, 0.833,333,333,333,333,333,33…)
+  ]
+[RESULT]
+r5 =
+  [
+    ($120.00, 0.5); ($13.00, 0.005); ($1,400.00, 10.0);
+    ($630.00, 1.826,086,956,521,739,130,4…); ($272.00, 0.68);
+    ($170.00, 0.833,333,333,333,333,333,33…)
+  ]
+[RESULT]
+r6 =
+  [
+    ($120.00, 0.5); ($13.00, 0.005); ($1,400.00, 10.0);
+    ($630.00, 1.826,086,956,521,739,130,4…); ($272.00, 0.68);
+    ($170.00, 0.833,333,333,333,333,333,33…)
+  ]
+```