Changed "do nothing" to "skip".

AST.ml

@@ -58,6 +58,7 @@ type kwd_not        = Region.t
 type kwd_of         = Region.t
 type kwd_procedure  = Region.t
 type kwd_record     = Region.t
+type kwd_skip       = Region.t
 type kwd_step       = Region.t
 type kwd_storage    = Region.t
 type kwd_then       = Region.t
@@ -323,7 +324,7 @@ and single_instr =
 | Loop      of loop
 | ProcCall  of fun_call
 | Fail      of fail_instr reg
-| DoNothing of Region.t
+| Skip      of kwd_skip
 
 and fail_instr = {
   kwd_fail  : kwd_fail;
@@ -650,7 +651,7 @@ let instr_to_region = function
 | Single Loop For ForInt     {region; _}
 | Single Loop For ForCollect {region; _}
 | Single ProcCall            {region; _}
-| Single DoNothing            region
+| Single Skip                region
 | Single Fail                {region; _}
 | Block                      {region; _} -> region
 
@@ -936,7 +937,7 @@ and print_single_instr = function
 | Loop     loop       -> print_loop loop
 | ProcCall fun_call   -> print_fun_call fun_call
 | Fail     {value; _} -> print_fail value
-| DoNothing region    -> print_token region "do nothing"
+| Skip     kwd_skip   -> print_token kwd_skip "skip"
 
 and print_fail {kwd_fail; fail_expr} =
   print_token kwd_fail "fail";

AST.mli

@@ -42,6 +42,7 @@ type kwd_not        = Region.t
 type kwd_of         = Region.t
 type kwd_procedure  = Region.t
 type kwd_record     = Region.t
+type kwd_skip       = Region.t
 type kwd_step       = Region.t
 type kwd_storage    = Region.t
 type kwd_then       = Region.t
@@ -307,7 +308,7 @@ and single_instr =
 | Loop      of loop
 | ProcCall  of fun_call
 | Fail      of fail_instr reg
-| DoNothing of Region.t
+| Skip      of kwd_skip
 
 and fail_instr = {
   kwd_fail  : kwd_fail;

LexToken.mli

@@ -70,7 +70,6 @@ type t =
 | Begin      of Region.t  (* "begin"      *)
 | Const      of Region.t  (* "const"      *)
 | Copy       of Region.t  (* "copy"       *)
-| Do         of Region.t  (* "do"         *)
 | Down       of Region.t  (* "down"       *)
 | Fail       of Region.t  (* "fail"       *)
 | If         of Region.t  (* "if"         *)
@@ -86,9 +85,9 @@ type t =
 | Then       of Region.t  (* "then"       *)
 | Else       of Region.t  (* "else"       *)
 | Match      of Region.t  (* "match"      *)
-| Nothing    of Region.t  (* "nothing"    *)
 | Procedure  of Region.t  (* "procedure"  *)
 | Record     of Region.t  (* "record"     *)
+| Skip       of Region.t  (* "skip"       *)
 | Step       of Region.t  (* "step"       *)
 | Storage    of Region.t  (* "storage"    *)
 | To         of Region.t  (* "to"         *)

LexToken.mll

@@ -69,7 +69,6 @@ type t =
 | Begin      of Region.t
 | Const      of Region.t
 | Copy       of Region.t
-| Do         of Region.t
 | Down       of Region.t
 | Fail       of Region.t
 | If         of Region.t
@@ -85,9 +84,9 @@ type t =
 | Then       of Region.t
 | Else       of Region.t
 | Match      of Region.t
-| Nothing    of Region.t
 | Procedure  of Region.t
 | Record     of Region.t
+| Skip       of Region.t
 | Step       of Region.t
 | Storage    of Region.t
 | To         of Region.t
@@ -189,7 +188,6 @@ let proj_token = function
 | Begin      region -> region, "Begin"
 | Const      region -> region, "Const"
 | Copy       region -> region, "Copy"
-| Do         region -> region, "Do"
 | Down       region -> region, "Down"
 | Fail       region -> region, "Fail"
 | If         region -> region, "If"
@@ -205,9 +203,9 @@ let proj_token = function
 | Then       region -> region, "Then"
 | Else       region -> region, "Else"
 | Match      region -> region, "Match"
-| Nothing    region -> region, "Nothing"
 | Procedure  region -> region, "Procedure"
 | Record     region -> region, "Record"
+| Skip       region -> region, "Skip"
 | Step       region -> region, "Step"
 | Storage    region -> region, "Storage"
 | To         region -> region, "To"
@@ -274,7 +272,6 @@ let to_lexeme = function
 | Begin      _ -> "begin"
 | Const      _ -> "const"
 | Copy       _ -> "copy"
-| Do         _ -> "do"
 | Down       _ -> "down"
 | Fail       _ -> "fail"
 | If         _ -> "if"
@@ -290,9 +287,9 @@ let to_lexeme = function
 | Then       _ -> "then"
 | Else       _ -> "else"
 | Match      _ -> "match"
-| Nothing    _ -> "nothing"
 | Procedure  _ -> "procedure"
 | Record     _ -> "record"
+| Skip       _ -> "skip"
 | Step       _ -> "step"
 | Storage    _ -> "storage"
 | To         _ -> "to"
@@ -327,7 +324,6 @@ let keywords = [
   (fun reg -> Begin      reg);
   (fun reg -> Const      reg);
   (fun reg -> Copy       reg);
-  (fun reg -> Do         reg);
   (fun reg -> Down       reg);
   (fun reg -> Fail       reg);
   (fun reg -> If         reg);
@@ -343,9 +339,9 @@ let keywords = [
   (fun reg -> Then       reg);
   (fun reg -> Else       reg);
   (fun reg -> Match      reg);
-  (fun reg -> Nothing    reg);
   (fun reg -> Procedure  reg);
   (fun reg -> Record     reg);
+  (fun reg -> Skip       reg);
   (fun reg -> Step       reg);
   (fun reg -> Storage    reg);
   (fun reg -> To         reg);
@@ -363,6 +359,7 @@ let reserved =
         |> add "assert"
         |> add "class"
         |> add "constraint"
+        |> add "do"
         |> add "done"
         |> add "downto"
         |> add "exception"
@@ -551,7 +548,6 @@ let is_kwd = function
   Begin      _
 | Const      _
 | Copy       _
-| Do         _
 | Down       _
 | Fail       _
 | If         _
@@ -567,9 +563,9 @@ let is_kwd = function
 | Then       _
 | Else       _
 | Match      _
-| Nothing    _
 | Procedure  _
 | Record     _
+| Skip       _
 | Step       _
 | Storage    _
 | To         _

ParToken.mly

@@ -47,7 +47,6 @@
 %token <Region.t> Begin       (* "begin"      *)
 %token <Region.t> Const       (* "const"      *)
 %token <Region.t> Copy        (* "copy"       *)
-%token <Region.t> Do          (* "do"         *)
 %token <Region.t> Down        (* "down"       *)
 %token <Region.t> Fail        (* "fail"       *)
 %token <Region.t> If          (* "if"         *)
@@ -63,9 +62,9 @@
 %token <Region.t> Then        (* "then"       *)
 %token <Region.t> Else        (* "else"       *)
 %token <Region.t> Match       (* "match"      *)
-%token <Region.t> Nothing     (* "nothing"    *)
 %token <Region.t> Procedure   (* "procedure"  *)
 %token <Region.t> Record      (* "record"     *)
+%token <Region.t> Skip        (* "skip"       *)
 %token <Region.t> Step        (* "step"       *)
 %token <Region.t> Storage     (* "storage"    *)
 %token <Region.t> To          (* "to"         *)

Parser.mly

@@ -419,7 +419,7 @@ single_instr:
 | loop        {     Loop $1 }
 | proc_call   { ProcCall $1 }
 | fail_instr  {     Fail $1 }
-| Do Nothing  { let region = cover $1 $2 in DoNothing region }
+| Skip        {     Skip $1 }
 
 fail_instr:
   Fail expr {

Tests/crowdfunding.ligo

@@ -22,7 +22,7 @@ entrypoint contribute (storage store : state;
               record
                 backers = add_binding ((sender, amount), store.backers)
               end
-      | _ -> do nothing
+      | _ -> skip
       end
   end with (store, operations)
 
@@ -39,7 +39,7 @@ entrypoint get_funds (storage store : state; const sender : address)
           end
         else fail "Below target"
       else fail "Too soon"
-    else do nothing
+    else skip
   end with (store, operations)
 
 entrypoint claim (storage store : state; const sender : address)