Updater: registration or a protocol now returns the registered module

src/lib_protocol_compiler/jbuild_embedded_protocol_template

@@ -27,10 +27,6 @@ let () = Format.kasprintf Jbuild_plugin.V1.send {|
       module CamlinternalFormatBasics = struct include CamlinternalFormatBasics end
 ")))
 
-(rule
- (targets registerer.mli)
- (action (write-file %%{targets} "(* empty *)")))
-
 (rule
  (targets registerer.ml)
  (deps tezos_embedded_protocol_environment_%s.cmxa

src/lib_protocol_compiler/main_embedded_packer.ml

@@ -55,11 +55,10 @@ end
 
 let () =
   Format.printf {|
-let () =
-  let module Ignored = Tezos_protocol_updater.Registered_protocol.Register_embedded
+module Registered =
+  Tezos_protocol_updater.Registered_protocol.Register_embedded
     (Tezos_embedded_protocol_environment_%s.Environment)
     (Tezos_embedded_raw_protocol_%s.Main)
-    (Source) in
-    ()
+    (Source)
 @.|}
     version version

src/lib_protocol_updater/registered_protocol.ml

@@ -97,26 +97,27 @@ module Register_embedded
        val sources: Protocol.t
      end) = struct
 
+  let hash =
+    match Source.hash with
+    | None -> Protocol.hash Source.sources
+    | Some hash -> hash
+  module Name = struct
+    let name = Protocol_hash.to_b58check hash
+  end
+  module Self = struct
+    module P = struct
+      let hash = hash
+      include Env.Lift(Proto)
+    end
+    include P
+    module Block_services = Block_services.Make(P)(P)
+    let complete_b58prefix = Env.Context.complete
+  end
   let () =
-    let hash =
-      match Source.hash with
-      | None -> Protocol.hash Source.sources
-      | Some hash -> hash in
-    let module Name = struct
-      let name = Protocol_hash.to_b58check hash
-    end in
     VersionTable.add
       sources hash Source.sources ;
     VersionTable.add
-      versions hash
-      (module struct
-        module P = struct
-          let hash = hash
-          include Env.Lift(Proto)
-        end
-        include P
-        module Block_services = Block_services.Make(P)(P)
-        let complete_b58prefix = Env.Context.complete
-      end : T)
+      versions hash (module Self : T)
 
+  include Self
 end

src/lib_protocol_updater/registered_protocol.mli

@@ -54,4 +54,8 @@ module Register_embedded
     (Source : sig
        val hash: Protocol_hash.t option
        val sources: Protocol.t
-     end) : sig end
+     end) :
+  T with type P.block_header_data = Proto.block_header_data
+     and type P.operation_data = Proto.operation_data
+     and type P.operation_receipt = Proto.operation_receipt
+     and type P.validation_state = Proto.validation_state