The only reserved name now is "args", for the backends' sake.

src/ligo/ligo-parser/LexToken.mll

@@ -387,45 +387,7 @@ let keywords = [
 
 let reserved =
   let open SSet in
-  empty |> add "as"
-        |> add "asr"
-        |> add "assert"
-        |> add "class"
-        |> add "constraint"
-        |> add "do"
-        |> add "done"
-        |> add "downto"
-        |> add "exception"
-        |> add "external"
-        |> add "false"
-        |> add "fun"
-        |> add "functor"
-        |> add "include"
-        |> add "inherit"
-        |> add "initializer"
-        |> add "land"
-        |> add "lazy"
-        |> add "let"
-        |> add "lor"
-        |> add "lsl"
-        |> add "lsr"
-        |> add "lxor"
-        |> add "method"
-        |> add "module"
-        |> add "mutable"
-        |> add "new"
-        |> add "nonrec"
-        |> add "object"
-        |> add "open"
-        |> add "private"
-        |> add "rec"
-        |> add "sig"
-        |> add "struct"
-        |> add "true"
-        |> add "try"
-        |> add "val"
-        |> add "virtual"
-        |> add "when"
+  empty |> add "args"
 
 let constructors = [
   (fun reg -> C_False reg);