Question: Isn't it a regression? 0.25.1 -> 0.26.1

[Kakadu]

The placement of a comma looks weird.

➜  /tmp cat a.ml                                                                       
      let rez =
        [%type:
          ( [%t ptyp_constr ~loc lident (List.map names ~f:(ptyp_var ~loc))]
          , [%t ptyp_constr ~loc lident_g (List.map names_2 ~f:(ptyp_var ~loc))] )
          OCanren.Reifier.t]
➜  /tmp ocamlformat a.ml                                                           
let rez =
  [%type:
    ( [%t ptyp_constr ~loc lident (List.map names ~f:(ptyp_var ~loc))]
    , [%t ptyp_constr ~loc lident_g (List.map names_2 ~f:(ptyp_var ~loc))] )
    OCanren.Reifier.t]
;;
➜  /tmp ocamlformat --version                                                               
0.25.1
➜  /tmp opam install ocamlformat.0.26.1                                                    
...
Done.
➜  /tmp ocamlformat a.ml                                                                          
let rez =
  [%type:
    ( [%t ptyp_constr ~loc lident (List.map names ~f:(ptyp_var ~loc))]
      , [%t ptyp_constr ~loc lident_g (List.map names_2 ~f:(ptyp_var ~loc))] )
      OCanren.Reifier.t]
;;
➜  /tmp ocamlformat --version                                                                       
0.26.1                                                                          
➜  /tmp cat .ocamlformat                                                                        
profile=janestreet

[Julow]

This is done to improve compatibility with ocp-indent for those that use both in their formatting pipeline. This appeared in #2428 and can be avoided with the option ocp-indent-compat=false (--no-ocp-indent-compat on the CLI)

[Kakadu]

Thanks, it helps. Another question: is there a list of options to migrate from version A to A+1 without changing the OCaml code? I believe that ocamlformat --print-config --profile=janestreet doesn't give a full list.

P.S. The answer is probably no, because you mention hidden options which are not available outside #2414
P.P.S. It is not a shortcoming of janestreet profile, it hapens with default too. It looks like 0.26.1 had increased indent somehow, in a manner that it is not controlled my 'max-indent='

@@ -1731,8 +1722,8 @@ module Make (AstHelpers : GTHELPERS_sig.S) = struct
         self#wrap_tr_function_str ~loc tdecl
           (Exp.app_list ~loc (Exp.new_ ~loc @@ Lident class_name)
           @@ List.map rec_typenames ~f:(fun name ->
-                 Exp.fun_ ~loc (Pat.unit ~loc)
-                 @@ Exp.sprintf ~loc "%s_%s" self#plugin_name name)
+               Exp.fun_ ~loc (Pat.unit ~loc)
+               @@ Exp.sprintf ~loc "%s_%s" self#plugin_name name)
           @ self#apply_fas_in_new_object ~loc tdecl)
 
       method fancy_app ~loc trf (inh : Exp.t) subj = Exp.app ~loc trf subj

[Julow]

There's no such backward compatibility options. We are very careful at the changes made to the default profile but that's not the case of the janestreet profile, which changes often.