imports don't appear to work

[commandodev]

I can't refer between proto files with imports:

// message.proto
message Msg {
  required string name = 1;
  extensions 100 to 199;
}

extend Msg {
  optional bool sameFile = 105;
}

// extension.proto
import "message.proto";


message Test {
  required Msg msg = 1;
}

extend Msg {
    optional string extn = 101;
}

running hprotoc -d hs *.proto gives:

Loading filepath: "/home/.../tst/extension.proto"
Loading filepath: "/home/.../tst/message.proto"
hprotoc: user error (Parsing proto:
"extension.proto"
has failed with message
Text.ProtocolBuffers.ProtoCompile.Resolve annErr: fqFileDP FileDescriptorProto (name,package) is (Just "extension.proto",Nothing)
  Text.ProtocolBuffers.ProtoCompile.Resolve annErr: fqMessage DescriptorProto name is Just "Test"
    Text.ProtocolBuffers.ProtoCompile.Resolve annErr: fqField FieldDescriptorProto name is Just "msg"
      Text.ProtocolBuffers.ProtoCompile.Resolve fatal error encountered, message:
        resolvePredEnv: Could not lookup "Msg"
        which parses as (False,[IName "Msg"])
        in environment: .Extension.Test in "extension.proto"
        looking for: Message or Group or Enum
        allowed (local):  [([IName "Extension",IName "Test"],[IName "msg"])]
        allowed (global): [(PackageID {getPackageID = [IName "Extension"]},[IName "Test",IName "extn"]),(PackageID {getPackageID = [IName "Message"]},[IName "Msg",IName "sameFile"])]

)

It works fine with protoc and running hprotoc -d hs message.proto also works as expected.

Appolgies if this isn't the right place to post bug (or if it's user error!)