I removed the annotation for the variable that iterates over collections.

for x in set s block { ... } // now
for x : t in set s block { ... } // before

src/passes/1-parser/pascaligo/AST.ml

@@ -432,8 +432,6 @@ and for_collect = {
   kwd_for    : kwd_for;
   var        : variable;
   bind_to    : (arrow * variable) option;
-  colon      : colon;
-  elt_type   : type_expr;
   kwd_in     : kwd_in;
   collection : collection;
   expr       : expr;

src/passes/1-parser/pascaligo/AST.mli

@@ -422,8 +422,6 @@ and for_collect = {
   kwd_for    : kwd_for;
   var        : variable;
   bind_to    : (arrow * variable) option;
-  colon      : colon;
-  elt_type   : type_expr;
   kwd_in     : kwd_in;
   collection : collection;
   expr       : expr;

src/passes/1-parser/pascaligo/Parser.mly

@@ -647,19 +647,17 @@ for_loop:
       block   = $5}
     in For (ForInt {region; value})
   }
-| For var option(arrow_clause) COLON type_expr
+| For var option(arrow_clause)
   In collection expr block {
-    let region = cover $1 $9.region in
+    let region = cover $1 $7.region in
     let value = {
       kwd_for    = $1;
       var        = $2;
       bind_to    = $3;
-      colon      = $4;
+      kwd_in     = $4;
-      elt_type   = $5;
+      collection = $5;
-      kwd_in     = $6;
+      expr       = $6;
-      collection = $7;
+      block      = $7}
-      expr       = $8;
-      block      = $9}
     in For (ForCollect {region; value})}
 
 collection:

src/passes/1-parser/pascaligo/ParserLog.ml

@@ -359,13 +359,11 @@ and print_var_assign buffer {value; _} =
   print_expr  buffer expr
 
 and print_for_collect buffer ({value; _} : for_collect reg) =
-  let {kwd_for; var; bind_to; colon; elt_type;
+  let {kwd_for; var; bind_to;
        kwd_in; collection; expr; block} = value in
   print_token      buffer kwd_for "for";
   print_var        buffer var;
   print_bind_to    buffer bind_to;
-  print_token      buffer colon ":";
-  print_type_expr  buffer elt_type;
   print_token      buffer kwd_in "in";
   print_collection buffer collection;
   print_expr       buffer expr;
@@ -1221,23 +1219,19 @@ and pp_var_assign buffer ~pad:(_,pc) asgn =
 
 and pp_for_collect buffer ~pad:(_,pc) collect =
   let () =
-    let pad = mk_pad 4 0 pc in
+    let pad = mk_pad 3 0 pc in
     match collect.bind_to with
       None ->
         pp_ident buffer ~pad collect.var
     | Some (_, var) ->
         pp_var_binding buffer ~pad (collect.var, var) in
   let () =
-    let _, pc  as pad = mk_pad 4 1 pc in
+    let _, pc  as pad = mk_pad 3 1 pc in
-    pp_node buffer ~pad "<element type>";
-    pp_type_expr buffer ~pad:(mk_pad 1 0 pc) collect.elt_type in
-  let () =
-    let _, pc  as pad = mk_pad 4 2 pc in
     pp_node buffer ~pad "<collection>";
     pp_collection buffer ~pad:(mk_pad 2 0 pc) collect.collection;
     pp_expr buffer ~pad:(mk_pad 1 0 pc) collect.expr in
   let () =
-      let pad = mk_pad 4 3 pc in
+      let pad = mk_pad 3 2 pc in
       let statements = collect.block.value.statements in
       pp_node buffer ~pad "<statements>";
       pp_statements buffer ~pad statements

src/test/contracts/loop.ligo

@@ -2,17 +2,17 @@
 
 function counter (var n : nat) : nat is block {
   var i : nat := 0n ;
-  while (i < n) block {
+  while i < n block {
-    i := i + 1n ;
+    i := i + 1n;
   }
 } with i
 
 function while_sum (var n : nat) : nat is block {
   var i : nat := 0n ;
   var r : nat := 0n ;
-  while (i < n) block {
+  while i < n block {
-    i := i + 1n ;
+    i := i + 1n;
-    r := r + i ;
+    r := r + i;
   }
 } with r
 
@@ -20,26 +20,26 @@ function for_sum (var n : nat) : int is block {
   var acc : int := 0 ;
   for i := 1 to int(n)
     begin
-      acc := acc + i ;
+      acc := acc + i;
     end
 } with acc
 
 function for_collection_list (var nee : unit) : (int * string) is block {
-  var acc : int := 0 ;
+  var acc : int := 0;
-  var st : string := "to" ;
+  var st : string := "to";
-  var mylist : list(int) := list 1 ; 1 ; 1 end ;
+  var mylist : list(int) := list 1; 1; 1 end;
-  for x : int in list mylist
+  for x in list mylist
     begin
-    acc := acc + x ;
+      acc := acc + x;
-    st := st^"to" ;
+      st := st ^ "to";
     end
 } with (acc, st)
 
 function for_collection_set (var nee : unit) : (int * string) is block {
-  var acc : int := 0 ;
+  var acc : int := 0;
-  var st : string := "to" ;
+  var st : string := "to";
-  var myset : set(int) := set 1 ; 2 ; 3 end ;
+  var myset : set(int) := set 1; 2; 3 end;
-  for x : int in set myset
+  for x in set myset
     begin
       acc := acc + x ;
       st := st^"to" ;
@@ -50,15 +50,15 @@ function for_collection_if_and_local_var (var nee : unit) : int is block {
   var acc : int := 0 ;
   const theone : int = 1 ;
   var myset : set(int) := set 1 ; 2 ; 3 end ;
-  for x : int in set myset
+  for x in set myset
     begin
       const thetwo : int = 2 ;
-    if (x=theone) then 
+      if x=theone then
-     acc := acc + x ;
+        acc := acc + x
-    else if (x=thetwo) then
+      else if x=thetwo then
-     acc := acc + thetwo ;
+        acc := acc + thetwo;
       else
-     acc := acc + 10 ;
+       acc := acc + 10;
     end
 } with acc
 
@@ -66,73 +66,71 @@ function for_collection_rhs_capture (var nee : unit) : int is block {
   var acc : int := 0 ;
   const mybigint : int = 1000 ;
   var myset : set(int) := set 1 ; 2 ; 3 end ;
-  for x : int in set myset
+  for x in set myset
     begin
-    if (x=1) then 
+      if x=1 then acc := acc + mybigint;
-     acc := acc + mybigint ;
+      else acc := acc + 10;
-    else 
-     acc := acc + 10 ;
     end
 } with acc
 
 function for_collection_proc_call (var nee : unit) : int is block {
   var acc : int := 0 ;
   var myset : set(int) := set 1 ; 2 ; 3 end ;
-  for x : int in set myset
+  for x in set myset
     begin
-    if (x=1) then 
+      if x=1 then
-     acc := acc + for_collection_rhs_capture(unit) ;
+       acc := acc + for_collection_rhs_capture(unit);
       else
-     acc := acc + 10 ;
+       acc := acc + 10;
     end
 } with acc
 
 function for_collection_comp_with_acc (var nee : unit) : int is block {
   var myint : int := 0 ;
   var mylist : list(int) := list 1 ; 10 ; 15 end;
-  for x : int in list mylist
+  for x in list mylist
     begin
-    if (x < myint) then skip ;
+      if x < myint then skip;
-    else myint := myint + 10 ;
+      else myint := myint + 10
     end
 } with myint
 
 function for_collection_with_patches (var nee : unit) : map(string,int) is block {
   var myint : int := 12 ;
-  var mylist : list(string) := list "I" ; "am" ; "foo" end;
+  var mylist : list(string) := list "I"; "am"; "foo" end;
   var mymap : map(string,int) := map end;
-  for x : string in list mylist
+  for x in list mylist
     begin
-    patch mymap with map [ x -> myint ];
+      patch mymap with map [x -> myint];
     end
 } with mymap
 
 function for_collection_empty (var nee : unit) : int is block {
   var acc : int := 0 ;
-  var myset : set(int) := set 1 ; 2 ; 3 end ;
+  var myset : set(int) := set 1; 2; 3 end;
-  for x : int in set myset
+  for x in set myset
     begin
-    skip ;
+      skip
     end
 } with acc
 
 function for_collection_map_kv (var nee : unit) : (int * string) is block {
-  var acc : int := 0 ;
+  var acc : int := 0;
-  var st : string := "" ;
+  var st : string := "";
-  var mymap : map(string,int) := map "1" -> 1 ; "2" -> 2 ; "3" -> 3 end ;
+  var mymap : map(string,int) := map "1" -> 1; "2" -> 2; "3" -> 3 end;
-  for k -> v : (string * int) in map mymap
+  for k -> v in map mymap
     begin
-    acc := acc + v ;
+      acc := acc + v;
-    st := st^k ;
+      st := st ^ k;
     end
 } with (acc, st)
 
 function for_collection_map_k (var nee : unit) : string is block {
   var st : string := "" ;
   var mymap : map(string,int) := map "1" -> 1 ; "2" -> 2 ; "3" -> 3 end ;
-  for k : string in map mymap
+  for k in map mymap
     begin
-    st := st^k ;
+      st := st ^ k;
     end
 } with st
 
@@ -152,5 +150,5 @@ function for_collection_map_k (var nee : unit) : string is block {
 // } with (myint,myst)
 
 function dummy (const n : nat) : nat is block {
-  while (False) block { skip }
+  while False block { skip }
 } with n