cannot opam install async.113.00.00

[Ashish Agarwal]

I did an `opam update`, and now I can no longer install async 113.00.00. Pinning to that version selects ppx_type_conv 113.09.00, which is giving me the error below. Is there a quick fix? Did there used to be an older version of ppx_type_conv? At present 113.09.00 is the earliest version.

#=== ERROR while installing ppx_type_conv.113.09.00 ===========================#

# opam-version 1.2.2

# os           darwin

...

# Error: Signature mismatch:

# [...]

#                          Ppx_type_conv.Std.Type_conv.Ppx_deriving_exporter.ppx_deriving_generator ->

#            ?type_decl_str:(Parsetree.structure,

#                            Parsetree.type_declaration list)

#                           Ppx_type_conv.Std.Type_conv.Ppx_deriving_exporter.ppx_deriving_generator ->

#            ?type_decl_sig:(Parsetree.signature,

#                            Parsetree.type_declaration list)

#                           Ppx_type_conv.Std.Type_conv.Ppx_deriving_exporter.ppx_deriving_generator ->

#            unit -> deriver

# Command exited with code 2.

### stderr ###

# W: Cannot find source file matching module 'ppx_type_conv' in library ppx_type_conv

# E: Failure("Command ''/Users/ashish/.opam/solvuu2/bin/ocamlbuild' src/ppx_type_conv.cma src/ppx_type_conv.cmxa src/ppx_type_conv.a src/ppx_type_conv.cmxs ppx_deriving_exporter/ppx_type_conv_deriving.cma ppx_deriving_exporter/ppx_type_conv_deriving.cmxa ppx_deriving_exporter/ppx_type_conv_deriving.a ppx_deriving_exporter/ppx_type_conv_deriving.cmxs -use-ocamlfind -tag debug' terminated with error code 10")

# make: *** [build] Error 1

[Malcolm Matalka]

You have to pin ppx_deriving to 3.3

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[Ashish Agarwal]

Thank you Malcolm!

[Malcolm Matalka]

I just happened to hit this yesterday :). I've begun making my own opam repo and pinning everything in it to avoid these situations.