Modify skeleton base expr_grammar_action.g to avoid compilation errors

expr_grammar_action.g

@@ -14,11 +14,11 @@ axiom S
 {
 
   open Symbols
-  open Utils
   open Ast
   open BatPrintf
   open BatBuffer
   open Batteries
+  open Utils
 
   (* TODO *)
   let resolve_associativity term other =

src/Makefile

@@ -11,7 +11,7 @@ TG = main.native
 all: $(TG)
 
 $(TG): $(SRC)
-	ocamlbuild -cflags -warn-error,"+a-26" -use-ocamlfind $(TG)
+	ocamlbuild -cflags  -warn-error,"+a-26" -cflags -w,"-26" -use-ocamlfind $(TG)
 
 test_lexer: $(SRC)
 	ocamlbuild -use-ocamlfind test_lexer.native