add 5.1 submodule and opam constraints

dune-project

@@ -32,7 +32,9 @@
  (synopsis "Toolchain to produce JS from Reason/OCaml")
  (depends
   (ocaml
-   (>= "5.2"))
+   (and
+    (>= "5.1")
+    (< "5.2")))
   (cmdliner
    (>= "1.1.0"))
   dune-build-info

flake.nix

@@ -11,7 +11,7 @@
     melange-compiler-libs = {
       # this changes rarely, and it's better than having to rely on nix's poor
       # support for submodules
-      url = "github:melange-re/melange-compiler-libs";
+      url = "github:melange-re/melange-compiler-libs/5.1";
       inputs.flake-utils.follows = "flake-utils";
       inputs.nixpkgs.follows = "nixpkgs";
     };
@@ -26,7 +26,7 @@
     } // (flake-utils.lib.eachDefaultSystem (system:
       let
         pkgs = nixpkgs.legacyPackages."${system}".extend (self: super: {
-          ocamlPackages = super.ocaml-ng.ocamlPackages_5_2;
+          ocamlPackages = super.ocaml-ng.ocamlPackages_5_1;
         });
 
         packages =

melange.opam

@@ -8,7 +8,7 @@ homepage: "https://github.com/melange-re/melange"
 bug-reports: "https://github.com/melange-re/melange/issues"
 depends: [
   "dune" {>= "3.13"}
-  "ocaml" {>= "5.2"}
+  "ocaml" {>= "5.1" & < "5.2"}
   "cmdliner" {>= "1.1.0"}
   "dune-build-info"
   "cppo" {build}
@@ -35,10 +35,3 @@ build: [
   ]
 ]
 dev-repo: "git+https://github.com/melange-re/melange.git"
-pin-depends: [
-  [ "merlin-lib.dev" "https://github.com/ocaml/merlin/releases/download/4.14-502_preview2/merlin-4.14-502.preview2.tbz" ]
-  [ "merlin.dev" "https://github.com/ocaml/merlin/releases/download/4.14-502_preview2/merlin-4.14-502.preview2.tbz" ]
-  [ "dot-merlin-reader.dev" "https://github.com/ocaml/merlin/releases/download/4.14-502_preview2/merlin-4.14-502.preview2.tbz" ]
-  [ "reason-react-ppx.dev" "git+https://github.com/reasonml/reason-react.git#anmonteiro/melange-4" ]
-  [ "reason-react.dev" "git+https://github.com/reasonml/reason-react.git#anmonteiro/melange-4" ]
-]