DRY code a bit

Author: cometkim

compiler/syntax/src/res_printer.ml

@@ -5044,20 +5044,12 @@ and print_argument ~state (arg_lbl, arg) cmt_tbl =
     in
     let printed_expr =
       let doc = print_expression_with_comments ~state expr cmt_tbl in
-      let doc =
-        match Parens.expr expr with
-        | Parenthesized -> add_parens doc
-        | Braced braces -> print_braces doc expr braces
-        | Nothing -> doc
-      in
-      match expr.pexp_desc with
-      | Pexp_apply
-          {
-            funct = {pexp_desc = Pexp_ident {txt = Longident.Lident "~~"}};
-            args = [(Nolabel, _)];
-          } ->
+      match Parens.expr expr with
+      | Parenthesized -> add_parens doc
+      | Braced braces -> print_braces doc expr braces
+      | Nothing when ParsetreeViewer.is_unary_bitnot_expression expr ->
         add_parens doc
-      | _ -> doc
+      | Nothing -> doc
     in
     let loc = {arg_loc with loc_end = expr.pexp_loc.loc_end} in
     let doc =