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5.3 compat (ppx_deriving, dream-httpaf) #26654

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```
=== ERROR while compiling ppx_deriving.6.0.2 =================================#
 context     2.2.1 | linux/x86_64 | ocaml-base-compiler.5.3.0~alpha1 | file:///home/opam/opam-repository
 path        ~/.opam/5.3~alpha1/.opam-switch/build/ppx_deriving.6.0.2
 command     ~/.opam/5.3~alpha1/bin/dune build -p ppx_deriving -j 255
 exit-code   1
 env-file    ~/.opam/log/ppx_deriving-1-37872c.env
 output-file ~/.opam/log/ppx_deriving-1-37872c.out
 ## output ###
 (cd _build/default && /home/opam/.opam/5.3~alpha1/bin/ocamlopt.opt -I src/.ppx_deriving_main.eobjs/byte -I src/.ppx_deriving_main.eobjs/native -I /home/opam/.opam/5.3~alpha1/lib/findlib -I /home/opam/.opam/5.3~alpha1/lib/ocaml/dynlink -intf-suffix .ml-gen -no-alias-deps -opaque -o src/.ppx_deriving_main.eobjs/native/findlib_initl.cmx -c -impl src/.ppx_deriving_main.eobjs/findlib_initl.ml-gen)
 File "_none_", line 1:
 Warning 58 [no-cmx-file]: no cmx file was found in path for module Findlib, and its interface was not compiled with -opaque
 (cd _build/default && /home/opam/.opam/5.3~alpha1/bin/ocamlopt.opt -w -40 -w -27-9 -g -I src/api/.ppx_deriving_api.objs/byte -I src/api/.ppx_deriving_api.objs/native -I /home/opam/.opam/5.3~alpha1/lib/ocaml-compiler-libs/common -I /home/opam/.opam/5.3~alpha1/lib/ocaml-compiler-libs/shadow -I /home/opam/.opam/5.3~alpha1/lib/ocaml/compiler-libs -I /home/opam/.opam/5.3~alpha1/lib/ppx_derivers -I /home/opam/.opam/5.3~alpha1/lib/ppxlib -I /home/opam/.opam/5.3~alpha1/lib/ppxlib/ast -I /home/opam/.opam/5.3~alpha1/lib/ppxlib/astlib -I /home/opam/.opam/5.3~alpha1/lib/ppxlib/print_diff -I /home/opam/.opam/5.3~alpha1/lib/ppxlib/stdppx -I /home/opam/.opam/5.3~alpha1/lib/ppxlib/traverse_builtins -I /home/opam/.opam/5.3~alpha1/lib/sexplib0 -I /home/opam/.opam/5.3~alpha1/lib/stdlib-shims -intf-suffix .ml -no-alias-deps -o src/api/.ppx_deriving_api.objs/native/ppx_deriving.cmx -c -impl src/api/ppx_deriving.pp.ml)
 File "ppx_deriving.cppo.ml", line 181, characters 30-33:
 Error: The value sub has type
          (Format.formatter -> unit) Ppxlib.Asttypes.loc list option
        but an expression was expected of type Location.msg list option
        Type
          (Format.formatter -> unit) Ppxlib.Asttypes.loc =
            (Format.formatter -> unit) Location.loc
        is not compatible with type Location.msg = Format_doc.t Location.loc
        Type Format.formatter -> unit is not compatible with type
          Format_doc.t = Format_doc.Doc.t
 (cd _build/default && /home/opam/.opam/5.3~alpha1/bin/ocamlc.opt -w -40 -w -27-9 -g -bin-annot -bin-annot-occurrences -I src/api/.ppx_deriving_api.objs/byte -I /home/opam/.opam/5.3~alpha1/lib/ocaml-compiler-libs/common -I /home/opam/.opam/5.3~alpha1/lib/ocaml-compiler-libs/shadow -I /home/opam/.opam/5.3~alpha1/lib/ocaml/compiler-libs -I /home/opam/.opam/5.3~alpha1/lib/ppx_derivers -I /home/opam/.opam/5.3~alpha1/lib/ppxlib -I /home/opam/.opam/5.3~alpha1/lib/ppxlib/ast -I /home/opam/.opam/5.3~alpha1/lib/ppxlib/astlib -I /home/opam/.opam/5.3~alpha1/lib/ppxlib/print_diff -I /home/opam/.opam/5.3~alpha1/lib/ppxlib/stdppx -I /home/opam/.opam/5.3~alpha1/lib/ppxlib/traverse_builtins -I /home/opam/.opam/5.3~alpha1/lib/sexplib0 -I /home/opam/.opam/5.3~alpha1/lib/stdlib-shims -intf-suffix .ml -no-alias-deps -o src/api/.ppx_deriving_api.objs/byte/ppx_deriving.cmo -c -impl src/api/ppx_deriving.pp.ml)
 File "ppx_deriving.cppo.ml", line 181, characters 30-33:
 Error: The value sub has type
          (Format.formatter -> unit) Ppxlib.Asttypes.loc list option
        but an expression was expected of type Location.msg list option
        Type
          (Format.formatter -> unit) Ppxlib.Asttypes.loc =
            (Format.formatter -> unit) Location.loc
        is not compatible with type Location.msg = Format_doc.t Location.loc
        Type Format.formatter -> unit is not compatible with type
          Format_doc.t = Format_doc.Doc.t
```
```
=== ERROR while compiling dream-httpaf.1.0.0~alpha3 ==========================#
 context     2.2.1 | linux/x86_64 | ocaml-base-compiler.5.3.0~alpha1 | file:///home/opam/opam-repository
 path        ~/.opam/5.3~alpha1/.opam-switch/build/dream-httpaf.1.0.0~alpha3
 command     ~/.opam/5.3~alpha1/bin/dune build -p dream-httpaf -j 255
 exit-code   1
 env-file    ~/.opam/log/dream-httpaf-1-ea8029.env
 output-file ~/.opam/log/dream-httpaf-1-ea8029.out
 ## output ###
 (cd _build/default && /home/opam/.opam/5.3~alpha1/bin/ocamlc.opt -w -40 -g -bin-annot -bin-annot-occurrences -I src/vendor/h2/hpack/util/.gen_huffman.eobjs/byte -I /home/opam/.opam/5.3~alpha1/lib/ocaml/compiler-libs -no-alias-deps -open Dune__exe -o src/vendor/h2/hpack/util/.gen_huffman.eobjs/byte/dune__exe__Gen_huffman.cmo -c -impl src/vendor/h2/hpack/util/gen_huffman.ml)
 File "src/vendor/h2/hpack/util/gen_huffman.ml", line 113, characters 28-71:
 113 |              [ Exp.constant (Pconst_integer (string_of_int code, None))
                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 Error: This expression should not be a constructor, the expected type is
        Parsetree.constant
```
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