Merge pull request #107 from ceastlund/support-4.12

Support 4.12

README.md

@@ -67,12 +67,13 @@ over the diff to make sure the difference are relevant. The `ast_...`
 files require some adjustments which should pop up when you do this
 diff. Port the old adjustments to the new file as required.
 
-Add migration functions:
-- Manually compile the asts (`ocamlc -c src/ast_{NEW,OLD}.ml -I +compiler-libs -I _build/default/src/.migrate_parsetree.objs/byte/ -open Migrate_parsetree__`)
+Add migration functions. In the commands below, set $OLD and $NEW to the
+appropriate version numbers, e.g. 408 and 409:
+- Manually compile the asts (`ocamlc -c src/ast_{$NEW,$OLD}.ml -I +compiler-libs -I _build/default/src/.migrate_parsetree.objs/byte/`)
 - Using `tools/gencopy.exe` (`dune build tools/gencopy.exe`), generate copy code to and from previous version (assuming it is 408):
 ```
-_build/default/tools/gencopy.exe -I . -I src/ -I +compiler-libs -map Ast_409:Ast_408 Ast_409.Parsetree.{expression,expr,pattern,pat,core_type,typ,toplevel_phrase} Ast_409.Outcometree.{out_phrase,out_type_extension} > src/migrate_parsetree_409_408_migrate.ml
-_build/default/tools/gencopy.exe -I . -I src/ -I +compiler-libs -map Ast_408:Ast_409 Ast_408.Parsetree.{expression,expr,pattern,pat,core_type,typ,toplevel_phrase} Ast_408.Outcometree.{out_phrase,out_type_extension} > src/migrate_parsetree_408_409_migrate.ml
+_build/default/tools/gencopy.exe -I . -I src/ -I +compiler-libs -map Ast_$NEW:Ast_$OLD Ast_$NEW.Parsetree.{expression,pattern,core_type,toplevel_phrase} > src/migrate_${NEW}_${OLD}.ml
+_build/default/tools/gencopy.exe -I . -I src/ -I +compiler-libs -map Ast_$OLD:Ast_$NEW Ast_$OLD.Parsetree.{expression,pattern,core_type,toplevel_phrase} > src/migrate_${OLD}_${NEW}.ml
 ```
 - Fix the generated code by implementing new cases
 

ocaml-migrate-parsetree.opam

@@ -15,7 +15,7 @@ build: [
 ]
 depends: [
   "dune" {>= "1.11"}
-  "ocaml" {>= "4.02.3" & < "4.12"}
+  "ocaml" {>= "4.02.3" & < "4.13"}
 ]
 synopsis: "Convert OCaml parsetrees between different versions"
 description: """