diff --git a/compiler/lcalc/monomorphize.ml b/compiler/lcalc/monomorphize.ml
index 9c6eda89..80fb040f 100644
--- a/compiler/lcalc/monomorphize.ml
+++ b/compiler/lcalc/monomorphize.ml
@@ -78,7 +78,7 @@ let collect_monomorphized_instances (prg : typed program) :
                           args;
                       name =
                         StructName.fresh []
-                          ( "tuple_" ^ string_of_int !option_instances_counter,
+                          ( "tuple_" ^ string_of_int !tuple_instances_counter,
                             Pos.no_pos );
                     })
               acc.tuples;
@@ -90,7 +90,7 @@ let collect_monomorphized_instances (prg : typed program) :
         {
           acc with
           arrays =
-            Type.Map.update t
+            Type.Map.update typ
               (fun monomorphized_name ->
                 match monomorphized_name with
                 | Some e -> Some e
@@ -118,7 +118,7 @@ let collect_monomorphized_instances (prg : typed program) :
         {
           acc with
           options =
-            Type.Map.update t
+            Type.Map.update typ
               (fun monomorphized_name ->
                 match monomorphized_name with
                 | Some e -> Some e
@@ -173,8 +173,9 @@ let rec monomorphize_typ
     (typ : typ) : typ =
   match Mark.remove typ with
   | TStruct _ | TEnum _ | TAny | TClosureEnv | TLit _ -> typ
-  | TArray t1 ->
-    TStruct (Type.Map.find t1 monomorphized_instances.arrays).name, Mark.get typ
+  | TArray _ ->
+    ( TStruct (Type.Map.find typ monomorphized_instances.arrays).name,
+      Mark.get typ )
   | TDefault t1 ->
     TDefault (monomorphize_typ monomorphized_instances t1), Mark.get typ
   | TArrow (t1s, t2) ->
@@ -185,8 +186,8 @@ let rec monomorphize_typ
   | TTuple _ ->
     ( TStruct (Type.Map.find typ monomorphized_instances.tuples).name,
       Mark.get typ )
-  | TOption t1 ->
-    TEnum (Type.Map.find t1 monomorphized_instances.options).name, Mark.get typ
+  | TOption _ ->
+    TEnum (Type.Map.find typ monomorphized_instances.options).name, Mark.get typ
 
 let is_some c =
   EnumConstructor.equal Expr.some_constr c
@@ -233,7 +234,12 @@ let rec monomorphize_expr
         field = fst (List.nth tuple_instance.fields index);
       }
   | EMatch { name; e; cases } when EnumName.equal name Expr.option_enum ->
-    let option_instance = Type.Map.find ty0 monomorphized_instances.options in
+    let opt_ty =
+      match e0 with EMatch { e; _ }, _ -> Expr.ty e | _ -> assert false
+    in
+    let option_instance =
+      Type.Map.find opt_ty monomorphized_instances.options
+    in
     EMatch
       {
         name = option_instance.name;
@@ -247,11 +253,7 @@ let rec monomorphize_expr
             cases EnumConstructor.Map.empty;
       }
   | EInj { name; e; cons } when EnumName.equal name Expr.option_enum ->
-    let option_instance =
-      Type.Map.find
-        (match Mark.remove ty0 with TOption t -> t | _ -> assert false)
-        monomorphized_instances.options
-    in
+    let option_instance = Type.Map.find ty0 monomorphized_instances.options in
     EInj
       {
         name = option_instance.name;
@@ -264,7 +266,7 @@ let rec monomorphize_expr
     let elt_ty =
       match Mark.remove ty0 with TArray t -> t | _ -> assert false
     in
-    let array_instance = Type.Map.find elt_ty monomorphized_instances.arrays in
+    let array_instance = Type.Map.find ty0 monomorphized_instances.arrays in
     EStruct
       {
         name = array_instance.name;
diff --git a/compiler/scalc/to_c.ml b/compiler/scalc/to_c.ml
index 72e18ad5..b7b4a890 100644
--- a/compiler/scalc/to_c.ml
+++ b/compiler/scalc/to_c.ml
@@ -313,8 +313,8 @@ let format_op (fmt : Format.formatter) (op : operator Mark.pos) : unit =
   | Reduce -> Format.pp_print_string fmt "catala_list_reduce"
   | Filter -> Format.pp_print_string fmt "catala_list_filter"
   | Fold -> Format.pp_print_string fmt "catala_list_fold_left"
-  | HandleExceptions | FromClosureEnv | ToClosureEnv | Map2 ->
-    failwith "unimplemented"
+  | HandleExceptions -> Format.pp_print_string fmt "catala_handle_exceptions"
+  | FromClosureEnv | ToClosureEnv | Map2 -> failwith "unimplemented"
 
 let _format_string_list (fmt : Format.formatter) (uids : string list) : unit =
   let sanitize_quotes = Re.compile (Re.char '"') in
diff --git a/compiler/shared_ast/print.ml b/compiler/shared_ast/print.ml
index f92b78a6..3a78aa08 100644
--- a/compiler/shared_ast/print.ml
+++ b/compiler/shared_ast/print.ml
@@ -142,7 +142,7 @@ let rec typ_gen
                mty))
         def punctuation "]")
   | TOption t ->
-    Format.fprintf fmt "@[<hov 2>%a@ %a@]" base_type "eoption" (typ ~colors) t
+    Format.fprintf fmt "@[<hov 2>%a@ %a@]" base_type "option" (typ ~colors) t
   | TArrow ([t1], t2) ->
     Format.fprintf fmt "@[<hov 2>%a@ %a@ %a@]" (typ_with_parens ~colors) t1
       op_style "→" (typ ~colors) t2
diff --git a/compiler/shared_ast/typing.ml b/compiler/shared_ast/typing.ml
index 6ac79c5b..ab6bf8d6 100644
--- a/compiler/shared_ast/typing.ml
+++ b/compiler/shared_ast/typing.ml
@@ -345,10 +345,7 @@ let polymorphic_op_return_type
   | Log (PosRecordIfTrueBool, _), _ -> uf (TLit TBool)
   | Log _, [tau] -> tau
   | Length, _ -> uf (TLit TInt)
-  | HandleExceptions, [tau] ->
-    let t_inner = any () in
-    unify ctx e tau (uf (TArray t_inner));
-    t_inner
+  | HandleExceptions, [_] -> any ()
   | ToClosureEnv, _ -> uf TClosureEnv
   | FromClosureEnv, _ -> any ()
   | _ -> Message.error ~pos "Mismatched operator arguments"
diff --git a/tests/backends/output/simple.c b/tests/backends/output/simple.c
index d68a1113..a90cc655 100644
--- a/tests/backends/output/simple.c
+++ b/tests/backends/output/simple.c
@@ -86,114 +86,116 @@ typedef struct array_1_struct {
   int length_field;
 } array_1_struct;
 
-typedef struct tuple_0_struct {
+typedef struct tuple_1_struct {
   option_1_enum (*elt_0_field)(void * /* closure_env */ arg_0_typ, void* /* unit */ arg_1_typ);
   void * /* closure_env */ elt_1_field;
-} tuple_0_struct;
+} tuple_1_struct;
 
 typedef struct baz_in_struct {
-  tuple_0_struct a_in_field;
+  tuple_1_struct a_in_field;
 } baz_in_struct;
 
 
 baz_struct baz_func(baz_in_struct baz_in) {
-  tuple_0_struct a;
+  tuple_1_struct a;
   a = baz_in.a_in_field;
   bar_enum temp_a;
   option_1_enum temp_a_1;
-  tuple_0_struct code_and_env;
+  tuple_1_struct code_and_env;
   code_and_env = a;
   option_1_enum (*code)(void * /* closure_env */ arg_0_typ, void* /* unit */ arg_1_typ);
   void * /* closure_env */ env;
   code = code_and_env.elt_0_field;
   env = code_and_env.elt_1_field;
-  option_1_enum exception_acc = {option_1_enum_none_1_cons,
-    {none_1_cons: NULL}};
-  option_1_enum exception_current;
-  char exception_conflict = 0;
-  exception_current = code(env, NULL);
-  if (exception_current.code == option_1_enum_some_1_cons) {
-    if (exception_acc.code == option_1_enum_some_1_cons) {
-      exception_conflict = 1;
-    } else {
-      exception_acc = exception_current;
-    }
-  }
-  if (exception_conflict) {
-    catala_raise_fatal_error(catala_conflict,
-      "tests/backends/simple.catala_en", 11, 11, 11, 12);
-  }
-  if (exception_acc.code == option_1_enum_some_1_cons) {
-    temp_a_1 = exception_acc;
-  } else {
-    if (1 /* TRUE */) {
-      bar_enum temp_a_2;
-      option_1_enum temp_a_3;
-      option_1_enum temp_a_4;
+  array_1_struct temp_a_2;
+  temp_a_2.content_field = catala_malloc(sizeof(array_1_struct));
+  temp_a_2.content_field[0] = code(env, NULL);
+  option_1_enum match_arg = catala_handle_exceptions(temp_a_2);
+  switch (match_arg.code) {
+    case option_1_enum_none_1_cons:
       if (1 /* TRUE */) {
-        bar_enum temp_a_5 = {bar_enum_no_cons, {no_cons: NULL}};
-        option_1_enum temp_a_6 = {option_1_enum_some_1_cons,
-          {some_1_cons: temp_a_5}};
-        temp_a_4 = temp_a_6;
-      } else {
-        temp_a_4.code = option_1_enum_none_1_cons;
-        temp_a_4.payload.none_1_cons = NULL;
-      }
-      option_1_enum exception_acc_1 = {option_1_enum_none_1_cons,
-        {none_1_cons: NULL}};
-      option_1_enum exception_current_1;
-      char exception_conflict_1 = 0;
-      exception_current_1 = temp_a_4;
-      if (exception_current_1.code == option_1_enum_some_1_cons) {
-        if (exception_acc_1.code == option_1_enum_some_1_cons) {
-          exception_conflict_1 = 1;
-        } else {
-          exception_acc_1 = exception_current_1;
+        bar_enum temp_a_3;
+        option_1_enum temp_a_4;
+        option_1_enum temp_a_5;
+        array_1_struct temp_a_6;
+        temp_a_6.content_field = catala_malloc(sizeof(array_1_struct));
+        
+        option_1_enum match_arg_1 = catala_handle_exceptions(temp_a_6);
+        switch (match_arg_1.code) {
+          case option_1_enum_none_1_cons:
+            if (1 /* TRUE */) {
+              bar_enum temp_a_7 = {bar_enum_no_cons, {no_cons: NULL}};
+              option_1_enum temp_a_5 = {option_1_enum_some_1_cons,
+                {some_1_cons: temp_a_7}};
+              
+            } else {
+              option_1_enum temp_a_5 = {option_1_enum_none_1_cons,
+                {none_1_cons: NULL}};
+              
+            }
+            break;
+          case option_1_enum_some_1_cons:
+            bar_enum x = match_arg_1.payload.some_1_cons;
+            option_1_enum temp_a_5 = {option_1_enum_some_1_cons,
+              {some_1_cons: x}};
+            break;
         }
-      }
-      if (exception_conflict_1) {
-        catala_raise_fatal_error(catala_conflict,
-          "tests/backends/simple.catala_en", 11, 11, 11, 12);
-      }
-      if (exception_acc_1.code == option_1_enum_some_1_cons) {
-        temp_a_3 = exception_acc_1;
-      } else {
-        if (0 /* FALSE */) {
-          option_1_enum temp_a_7 = {option_1_enum_none_1_cons,
-            {none_1_cons: NULL}};
-          temp_a_3 = temp_a_7;
-        } else {
-          temp_a_3.code = option_1_enum_none_1_cons;
-          temp_a_3.payload.none_1_cons = NULL;
+        array_1_struct temp_a_8;
+        temp_a_8.content_field = catala_malloc(sizeof(array_1_struct));
+        temp_a_8.content_field[0] = temp_a_5;
+        option_1_enum match_arg_2 = catala_handle_exceptions(temp_a_8);
+        switch (match_arg_2.code) {
+          case option_1_enum_none_1_cons:
+            if (0 /* FALSE */) {
+              option_1_enum temp_a_4 = {option_1_enum_none_1_cons,
+                {none_1_cons: NULL}};
+              
+            } else {
+              option_1_enum temp_a_4 = {option_1_enum_none_1_cons,
+                {none_1_cons: NULL}};
+              
+            }
+            break;
+          case option_1_enum_some_1_cons:
+            bar_enum x_1 = match_arg_2.payload.some_1_cons;
+            option_1_enum temp_a_4 = {option_1_enum_some_1_cons,
+              {some_1_cons: x_1}};
+            break;
         }
+        option_1_enum match_arg_3 = temp_a_4;
+        switch (match_arg_3.code) {
+          case option_1_enum_none_1_cons:
+            catala_raise_fatal_error (catala_no_value,
+              "tests/backends/simple.catala_en", 11, 11, 11, 12);
+            break;
+          case option_1_enum_some_1_cons:
+            bar_enum arg = match_arg_3.payload.some_1_cons;
+            temp_a_3 = arg;
+            break;
+        }
+        option_1_enum temp_a_1 = {option_1_enum_some_1_cons,
+          {some_1_cons: temp_a_3}};
+        
+      } else {
+        option_1_enum temp_a_1 = {option_1_enum_none_1_cons,
+          {none_1_cons: NULL}};
+        
       }
-      option_1_enum match_arg = temp_a_3;
-      switch (match_arg.code) {
-        case option_1_enum_none_1_cons:
-          catala_raise_fatal_error (catala_no_value,
-            "tests/backends/simple.catala_en", 11, 11, 11, 12);
-          break;
-        case option_1_enum_some_1_cons:
-          bar_enum arg = match_arg.payload.some_1_cons;
-          temp_a_2 = arg;
-          break;
-      }
-      option_1_enum temp_a_8 = {option_1_enum_some_1_cons,
-        {some_1_cons: temp_a_2}};
-      temp_a_1 = temp_a_8;
-    } else {
-      temp_a_1.code = option_1_enum_none_1_cons;
-      temp_a_1.payload.none_1_cons = NULL;
-    }
+      break;
+    case option_1_enum_some_1_cons:
+      bar_enum x_2 = match_arg.payload.some_1_cons;
+      option_1_enum temp_a_1 = {option_1_enum_some_1_cons,
+        {some_1_cons: x_2}};
+      break;
   }
-  option_1_enum match_arg_1 = temp_a_1;
-  switch (match_arg_1.code) {
+  option_1_enum match_arg_4 = temp_a_1;
+  switch (match_arg_4.code) {
     case option_1_enum_none_1_cons:
       catala_raise_fatal_error (catala_no_value,
         "tests/backends/simple.catala_en", 11, 11, 11, 12);
       break;
     case option_1_enum_some_1_cons:
-      bar_enum arg_1 = match_arg_1.payload.some_1_cons;
+      bar_enum arg_1 = match_arg_4.payload.some_1_cons;
       temp_a = arg_1;
       break;
   }
@@ -203,133 +205,143 @@ baz_struct baz_func(baz_in_struct baz_in) {
   option_2_enum temp_b_1;
   option_2_enum temp_b_2;
   option_2_enum temp_b_3;
-  char /* bool */ temp_b_4;
-  bar_enum match_arg_2 = a_1;
-  switch (match_arg_2.code) {
-    case bar_enum_no_cons: temp_b_4 = 1 /* TRUE */; break;
-    case bar_enum_yes_cons:
-      foo_struct dummy_var = match_arg_2.payload.yes_cons;
-      temp_b_4 = 0 /* FALSE */;
+  array_2_struct temp_b_4;
+  temp_b_4.content_field = catala_malloc(sizeof(array_2_struct));
+  
+  option_2_enum match_arg_5 = catala_handle_exceptions(temp_b_4);
+  switch (match_arg_5.code) {
+    case option_2_enum_none_2_cons:
+      char /* bool */ temp_b_5;
+      bar_enum match_arg_6 = a_1;
+      switch (match_arg_6.code) {
+        case bar_enum_no_cons: temp_b_5 = 1 /* TRUE */; break;
+        case bar_enum_yes_cons:
+          foo_struct dummy_var = match_arg_6.payload.yes_cons;
+          temp_b_5 = 0 /* FALSE */;
+          break;
+      }
+      if (temp_b_5) {
+        option_2_enum temp_b_3 = {option_2_enum_some_2_cons,
+          {some_2_cons: 42.}};
+        
+      } else {
+        option_2_enum temp_b_3 = {option_2_enum_none_2_cons,
+          {none_2_cons: NULL}};
+        
+      }
+      break;
+    case option_2_enum_some_2_cons:
+      double x_3 = match_arg_5.payload.some_2_cons;
+      option_2_enum temp_b_3 = {option_2_enum_some_2_cons,
+        {some_2_cons: x_3}};
       break;
   }
-  if (temp_b_4) {
-    option_2_enum temp_b_5 = {option_2_enum_some_2_cons, {some_2_cons: 42.}};
-    temp_b_3 = temp_b_5;
-  } else {
-    temp_b_3.code = option_2_enum_none_2_cons;
-    temp_b_3.payload.none_2_cons = NULL;
+  array_2_struct temp_b_6;
+  temp_b_6.content_field = catala_malloc(sizeof(array_2_struct));
+  temp_b_6.content_field[0] = temp_b_3;
+  option_2_enum match_arg_7 = catala_handle_exceptions(temp_b_6);
+  switch (match_arg_7.code) {
+    case option_2_enum_none_2_cons:
+      if (0 /* FALSE */) {
+        option_2_enum temp_b_2 = {option_2_enum_none_2_cons,
+          {none_2_cons: NULL}};
+        
+      } else {
+        option_2_enum temp_b_2 = {option_2_enum_none_2_cons,
+          {none_2_cons: NULL}};
+        
+      }
+      break;
+    case option_2_enum_some_2_cons:
+      double x_4 = match_arg_7.payload.some_2_cons;
+      option_2_enum temp_b_2 = {option_2_enum_some_2_cons,
+        {some_2_cons: x_4}};
+      break;
   }
-  option_2_enum exception_acc_2 = {option_2_enum_none_2_cons,
-    {none_2_cons: NULL}};
-  option_2_enum exception_current_2;
-  char exception_conflict_2 = 0;
-  exception_current_2 = temp_b_3;
-  if (exception_current_2.code == option_2_enum_some_2_cons) {
-    if (exception_acc_2.code == option_2_enum_some_2_cons) {
-      exception_conflict_2 = 1;
-    } else {
-      exception_acc_2 = exception_current_2;
-    }
-  }
-  if (exception_conflict_2) {
-    catala_raise_fatal_error(catala_conflict,
-      "tests/backends/simple.catala_en", 12, 10, 12, 11);
-  }
-  if (exception_acc_2.code == option_2_enum_some_2_cons) {
-    temp_b_2 = exception_acc_2;
-  } else {
-    if (0 /* FALSE */) {
-      option_2_enum temp_b_6 = {option_2_enum_none_2_cons,
-        {none_2_cons: NULL}};
-      temp_b_2 = temp_b_6;
-    } else {
-      temp_b_2.code = option_2_enum_none_2_cons;
-      temp_b_2.payload.none_2_cons = NULL;
-    }
-  }
-  option_2_enum exception_acc_3 = {option_2_enum_none_2_cons,
-    {none_2_cons: NULL}};
-  option_2_enum exception_current_3;
-  char exception_conflict_3 = 0;
-  exception_current_3 = temp_b_2;
-  if (exception_current_3.code == option_2_enum_some_2_cons) {
-    if (exception_acc_3.code == option_2_enum_some_2_cons) {
-      exception_conflict_3 = 1;
-    } else {
-      exception_acc_3 = exception_current_3;
-    }
-  }
-  if (exception_conflict_3) {
-    catala_raise_fatal_error(catala_conflict,
-      "tests/backends/simple.catala_en", 12, 10, 12, 11);
-  }
-  if (exception_acc_3.code == option_2_enum_some_2_cons) {
-    temp_b_1 = exception_acc_3;
-  } else {
-    if (1 /* TRUE */) {
-      option_2_enum temp_b_7;
-      option_2_enum temp_b_8;
+  array_2_struct temp_b_7;
+  temp_b_7.content_field = catala_malloc(sizeof(array_2_struct));
+  temp_b_7.content_field[0] = temp_b_2;
+  option_2_enum match_arg_8 = catala_handle_exceptions(temp_b_7);
+  switch (match_arg_8.code) {
+    case option_2_enum_none_2_cons:
       if (1 /* TRUE */) {
-        double temp_b_9;
-        bar_enum match_arg_3 = a_1;
-        switch (match_arg_3.code) {
-          case bar_enum_no_cons: temp_b_9 = 0.; break;
-          case bar_enum_yes_cons:
-            foo_struct foo = match_arg_3.payload.yes_cons;
-            double temp_b_10;
-            if (foo.x_field) {temp_b_10 = 1.; } else {temp_b_10 = 0.; }
-            temp_b_9 = (foo.y_field + temp_b_10);
+        option_2_enum temp_b_8;
+        array_2_struct temp_b_9;
+        temp_b_9.content_field = catala_malloc(sizeof(array_2_struct));
+        
+        option_2_enum match_arg_9 = catala_handle_exceptions(temp_b_9);
+        switch (match_arg_9.code) {
+          case option_2_enum_none_2_cons:
+            if (1 /* TRUE */) {
+              double temp_b_10;
+              bar_enum match_arg_10 = a_1;
+              switch (match_arg_10.code) {
+                case bar_enum_no_cons: temp_b_10 = 0.; break;
+                case bar_enum_yes_cons:
+                  foo_struct foo = match_arg_10.payload.yes_cons;
+                  double temp_b_11;
+                  if (foo.x_field) {temp_b_11 = 1.; } else {temp_b_11 = 0.; }
+                  temp_b_10 = (foo.y_field + temp_b_11);
+                  break;
+              }
+              option_2_enum temp_b_8 = {option_2_enum_some_2_cons,
+                {some_2_cons: temp_b_10}};
+              
+            } else {
+              option_2_enum temp_b_8 = {option_2_enum_none_2_cons,
+                {none_2_cons: NULL}};
+              
+            }
+            break;
+          case option_2_enum_some_2_cons:
+            double x_5 = match_arg_9.payload.some_2_cons;
+            option_2_enum temp_b_8 = {option_2_enum_some_2_cons,
+              {some_2_cons: x_5}};
             break;
         }
-        option_2_enum temp_b_11 = {option_2_enum_some_2_cons,
-          {some_2_cons: temp_b_9}};
-        temp_b_8 = temp_b_11;
-      } else {
-        temp_b_8.code = option_2_enum_none_2_cons;
-        temp_b_8.payload.none_2_cons = NULL;
-      }
-      option_2_enum exception_acc_4 = {option_2_enum_none_2_cons,
-        {none_2_cons: NULL}};
-      option_2_enum exception_current_4;
-      char exception_conflict_4 = 0;
-      exception_current_4 = temp_b_8;
-      if (exception_current_4.code == option_2_enum_some_2_cons) {
-        if (exception_acc_4.code == option_2_enum_some_2_cons) {
-          exception_conflict_4 = 1;
-        } else {
-          exception_acc_4 = exception_current_4;
+        array_2_struct temp_b_12;
+        temp_b_12.content_field = catala_malloc(sizeof(array_2_struct));
+        temp_b_12.content_field[0] = temp_b_8;
+        option_2_enum match_arg_11 = catala_handle_exceptions(temp_b_12);
+        switch (match_arg_11.code) {
+          case option_2_enum_none_2_cons:
+            if (0 /* FALSE */) {
+              option_2_enum temp_b_1 = {option_2_enum_none_2_cons,
+                {none_2_cons: NULL}};
+              
+            } else {
+              option_2_enum temp_b_1 = {option_2_enum_none_2_cons,
+                {none_2_cons: NULL}};
+              
+            }
+            break;
+          case option_2_enum_some_2_cons:
+            double x_6 = match_arg_11.payload.some_2_cons;
+            option_2_enum temp_b_1 = {option_2_enum_some_2_cons,
+              {some_2_cons: x_6}};
+            break;
         }
-      }
-      if (exception_conflict_4) {
-        catala_raise_fatal_error(catala_conflict,
-          "tests/backends/simple.catala_en", 12, 10, 12, 11);
-      }
-      if (exception_acc_4.code == option_2_enum_some_2_cons) {
-        temp_b_7 = exception_acc_4;
+        
       } else {
-        if (0 /* FALSE */) {
-          option_2_enum temp_b_12 = {option_2_enum_none_2_cons,
-            {none_2_cons: NULL}};
-          temp_b_7 = temp_b_12;
-        } else {
-          temp_b_7.code = option_2_enum_none_2_cons;
-          temp_b_7.payload.none_2_cons = NULL;
-        }
+        option_2_enum temp_b_1 = {option_2_enum_none_2_cons,
+          {none_2_cons: NULL}};
+        
       }
-      temp_b_1 = temp_b_7;
-    } else {
-      temp_b_1.code = option_2_enum_none_2_cons;
-      temp_b_1.payload.none_2_cons = NULL;
-    }
+      break;
+    case option_2_enum_some_2_cons:
+      double x_7 = match_arg_8.payload.some_2_cons;
+      option_2_enum temp_b_1 = {option_2_enum_some_2_cons,
+        {some_2_cons: x_7}};
+      break;
   }
-  option_2_enum match_arg_4 = temp_b_1;
-  switch (match_arg_4.code) {
+  option_2_enum match_arg_12 = temp_b_1;
+  switch (match_arg_12.code) {
     case option_2_enum_none_2_cons:
       catala_raise_fatal_error (catala_no_value,
         "tests/backends/simple.catala_en", 12, 10, 12, 11);
       break;
     case option_2_enum_some_2_cons:
-      double arg_2 = match_arg_4.payload.some_2_cons;
+      double arg_2 = match_arg_12.payload.some_2_cons;
       temp_b = arg_2;
       break;
   }
@@ -338,54 +350,62 @@ baz_struct baz_func(baz_in_struct baz_in) {
   array_3_struct temp_c;
   option_3_enum temp_c_1;
   option_3_enum temp_c_2;
-  if (1 /* TRUE */) {
-    array_3_struct temp_c_3;
-    temp_c_3.content_field = catala_malloc(sizeof(array_3_struct));
-    temp_c_3.content_field[0] = b;
-    temp_c_3.content_field[1] = b;
-    option_3_enum temp_c_4 = {option_3_enum_some_3_cons,
-      {some_3_cons: temp_c_3}};
-    temp_c_2 = temp_c_4;
-  } else {
-    temp_c_2.code = option_3_enum_none_3_cons;
-    temp_c_2.payload.none_3_cons = NULL;
+  array_4_struct temp_c_3;
+  temp_c_3.content_field = catala_malloc(sizeof(array_4_struct));
+  
+  option_3_enum match_arg_13 = catala_handle_exceptions(temp_c_3);
+  switch (match_arg_13.code) {
+    case option_3_enum_none_3_cons:
+      if (1 /* TRUE */) {
+        array_3_struct temp_c_4;
+        temp_c_4.content_field = catala_malloc(sizeof(array_3_struct));
+        temp_c_4.content_field[0] = b;
+        temp_c_4.content_field[1] = b;
+        option_3_enum temp_c_2 = {option_3_enum_some_3_cons,
+          {some_3_cons: temp_c_4}};
+        
+      } else {
+        option_3_enum temp_c_2 = {option_3_enum_none_3_cons,
+          {none_3_cons: NULL}};
+        
+      }
+      break;
+    case option_3_enum_some_3_cons:
+      array_3_struct x_8 = match_arg_13.payload.some_3_cons;
+      option_3_enum temp_c_2 = {option_3_enum_some_3_cons,
+        {some_3_cons: x_8}};
+      break;
   }
-  option_3_enum exception_acc_5 = {option_3_enum_none_3_cons,
-    {none_3_cons: NULL}};
-  option_3_enum exception_current_5;
-  char exception_conflict_5 = 0;
-  exception_current_5 = temp_c_2;
-  if (exception_current_5.code == option_3_enum_some_3_cons) {
-    if (exception_acc_5.code == option_3_enum_some_3_cons) {
-      exception_conflict_5 = 1;
-    } else {
-      exception_acc_5 = exception_current_5;
-    }
+  array_4_struct temp_c_5;
+  temp_c_5.content_field = catala_malloc(sizeof(array_4_struct));
+  temp_c_5.content_field[0] = temp_c_2;
+  option_3_enum match_arg_14 = catala_handle_exceptions(temp_c_5);
+  switch (match_arg_14.code) {
+    case option_3_enum_none_3_cons:
+      if (0 /* FALSE */) {
+        option_3_enum temp_c_1 = {option_3_enum_none_3_cons,
+          {none_3_cons: NULL}};
+        
+      } else {
+        option_3_enum temp_c_1 = {option_3_enum_none_3_cons,
+          {none_3_cons: NULL}};
+        
+      }
+      break;
+    case option_3_enum_some_3_cons:
+      array_3_struct x_9 = match_arg_14.payload.some_3_cons;
+      option_3_enum temp_c_1 = {option_3_enum_some_3_cons,
+        {some_3_cons: x_9}};
+      break;
   }
-  if (exception_conflict_5) {
-    catala_raise_fatal_error(catala_conflict,
-      "tests/backends/simple.catala_en", 13, 10, 13, 11);
-  }
-  if (exception_acc_5.code == option_3_enum_some_3_cons) {
-    temp_c_1 = exception_acc_5;
-  } else {
-    if (0 /* FALSE */) {
-      option_3_enum temp_c_5 = {option_3_enum_none_3_cons,
-        {none_3_cons: NULL}};
-      temp_c_1 = temp_c_5;
-    } else {
-      temp_c_1.code = option_3_enum_none_3_cons;
-      temp_c_1.payload.none_3_cons = NULL;
-    }
-  }
-  option_3_enum match_arg_5 = temp_c_1;
-  switch (match_arg_5.code) {
+  option_3_enum match_arg_15 = temp_c_1;
+  switch (match_arg_15.code) {
     case option_3_enum_none_3_cons:
       catala_raise_fatal_error (catala_no_value,
         "tests/backends/simple.catala_en", 13, 10, 13, 11);
       break;
     case option_3_enum_some_3_cons:
-      array_3_struct arg_3 = match_arg_5.payload.some_3_cons;
+      array_3_struct arg_3 = match_arg_15.payload.some_3_cons;
       temp_c = arg_3;
       break;
   }
diff --git a/tests/func/good/scope_call_func_struct_closure.catala_en b/tests/func/good/scope_call_func_struct_closure.catala_en
index e77a00b7..67619876 100644
--- a/tests/func/good/scope_call_func_struct_closure.catala_en
+++ b/tests/func/good/scope_call_func_struct_closure.catala_en
@@ -70,7 +70,7 @@ type SubFoo2 = {
   x1: integer;
   y: ((closure_env, integer) → integer, closure_env);
 }
-type Foo_in = { b_in: ((closure_env, unit) → eoption bool, closure_env); }
+type Foo_in = { b_in: ((closure_env, unit) → option bool, closure_env); }
 type Foo = { z: integer; }
 
 let topval closure_y1 : (closure_env, integer) → integer =
@@ -118,11 +118,10 @@ let topval closure_r1 : (closure_env, integer) → integer =
   in
   code_and_env.0 code_and_env.1 param0
 let scope Foo
-  (Foo_in:
-     Foo_in {b_in: ((closure_env, unit) → eoption bool, closure_env)})
+  (Foo_in: Foo_in {b_in: ((closure_env, unit) → option bool, closure_env)})
   : Foo {z: integer}
   =
-  let get b : ((closure_env, unit) → eoption bool, closure_env) =
+  let get b : ((closure_env, unit) → option bool, closure_env) =
     Foo_in.b_in
   in
   let set b : bool =
diff --git a/tests/monomorphisation/context_var.catala_en b/tests/monomorphisation/context_var.catala_en
new file mode 100644
index 00000000..02ea2fe9
--- /dev/null
+++ b/tests/monomorphisation/context_var.catala_en
@@ -0,0 +1,111 @@
+## Testing monomorphisation on context variables
+
+```catala
+declaration scope TestXor:
+  context output t content boolean
+
+scope TestXor:
+  definition t equals true
+```
+
+```catala-test-inline
+$ catala lcalc --monomorphize-types
+type option_1 = | None_1 of unit | Some_1 of bool
+
+type TestXor_in = { t_in: unit → option_1[None_1: unit | Some_1: bool]; }
+type TestXor = { t: bool; }
+type array_1 = {
+  content: list of option_1[None_1: unit | Some_1: bool];
+  length: integer;
+}
+
+let scope TestXor
+  (TestXor_in:
+     TestXor_in {t_in: unit → option_1[None_1: unit | Some_1: bool]})
+  : TestXor {t: bool}
+  =
+  let get t : unit → option_1[None_1: unit | Some_1: bool] =
+    TestXor_in.t_in
+  in
+  let set t : bool =
+    match
+      (match
+         (handle_exceptions { array_1 content = [t ()]; length = 1; })
+       with
+       | None_1 →
+         if true then
+           Some_1
+             (match
+                (match
+                   (handle_exceptions
+                      { array_1
+                        content =
+                          [
+                            match
+                              (handle_exceptions
+                                 { array_1 content = []; length = 0; })
+                            with
+                            | None_1 →
+                              if true then Some_1 true else None_1 ()
+                            | Some_1 x → Some_1 x
+                          ];
+                        length = 1;
+                      })
+                 with
+                 | None_1 → if false then None_1 () else None_1 ()
+                 | Some_1 x → Some_1 x)
+              with
+              | None_1 → error NoValue
+              | Some_1 arg → arg)
+         else None_1 ()
+       | Some_1 x → Some_1 x)
+    with
+    | None_1 → error NoValue
+    | Some_1 arg → arg
+  in
+  return { TestXor t = t; }
+
+```
+
+```catala
+declaration scope TestXor2:
+  t scope TestXor
+  output o content boolean
+
+scope TestXor2:
+  definition o equals t.t
+```
+
+```catala-test-inline
+$ catala lcalc --monomorphize-types -s TestXor2
+let scope TestXor2 (TestXor2_in: TestXor2_in): TestXor2 {o: bool} =
+  let set t : TestXor {t: bool} =
+    let result : TestXor = TestXor { TestXor_in t_in = λ () → None_1 (); } in
+    let result1 : TestXor = { TestXor t = result.t; } in
+    if true then result1 else result1
+  in
+  let set o : bool =
+    match
+      (match
+         (handle_exceptions
+            { array_1
+              content =
+                [
+                  match
+                    (handle_exceptions { array_1 content = []; length = 0; })
+                  with
+                  | None_1 → if true then Some_1 t.t else None_1 ()
+                  | Some_1 x → Some_1 x
+                ];
+              length = 1;
+            })
+       with
+       | None_1 → if false then None_1 () else None_1 ()
+       | Some_1 x → Some_1 x)
+    with
+    | None_1 → error NoValue
+    | Some_1 arg → arg
+  in
+  return { TestXor2 o = o; }
+```
+
diff --git a/tests/name_resolution/good/toplevel_defs.catala_en b/tests/name_resolution/good/toplevel_defs.catala_en
index 07bf432b..0ba58d25 100644
--- a/tests/name_resolution/good/toplevel_defs.catala_en
+++ b/tests/name_resolution/good/toplevel_defs.catala_en
@@ -126,8 +126,8 @@ let glob2_9 = A {"y": glob1_2 >= 30., "z": 123. * 17.}
 
 let S2_5 (S2_in_10: S2_in) =
   decl temp_a_12 : decimal;
-  decl temp_a_13 : eoption decimal;
-  decl temp_a_14 : eoption decimal;
+  decl temp_a_13 : option decimal;
+  decl temp_a_14 : option decimal;
   switch handle_exceptions []:
   | ENone __15 →
     if true:
@@ -155,8 +155,8 @@ let S2_5 (S2_in_10: S2_in) =
 
 let S3_6 (S3_in_21: S3_in) =
   decl temp_a_23 : decimal;
-  decl temp_a_24 : eoption decimal;
-  decl temp_a_25 : eoption decimal;
+  decl temp_a_24 : option decimal;
+  decl temp_a_25 : option decimal;
   switch handle_exceptions []:
   | ENone __26 →
     if true:
@@ -184,8 +184,8 @@ let S3_6 (S3_in_21: S3_in) =
 
 let S4_7 (S4_in_32: S4_in) =
   decl temp_a_34 : decimal;
-  decl temp_a_35 : eoption decimal;
-  decl temp_a_36 : eoption decimal;
+  decl temp_a_35 : option decimal;
+  decl temp_a_36 : option decimal;
   switch handle_exceptions []:
   | ENone __37 →
     if true:
@@ -213,8 +213,8 @@ let S4_7 (S4_in_32: S4_in) =
 
 let S_8 (S_in_43: S_in) =
   decl temp_a_55 : decimal;
-  decl temp_a_56 : eoption decimal;
-  decl temp_a_57 : eoption decimal;
+  decl temp_a_56 : option decimal;
+  decl temp_a_57 : option decimal;
   switch handle_exceptions []:
   | ENone __58 →
     if true:
@@ -239,8 +239,8 @@ let S_8 (S_in_43: S_in) =
   decl a_44 : decimal;
   a_44 = temp_a_55;
   decl temp_b_46 : A {y: bool; z: decimal};
-  decl temp_b_47 : eoption A {y: bool; z: decimal};
-  decl temp_b_48 : eoption A {y: bool; z: decimal};
+  decl temp_b_47 : option A {y: bool; z: decimal};
+  decl temp_b_48 : option A {y: bool; z: decimal};
   switch handle_exceptions []:
   | ENone __49 →
     if true: