mpidl returns error (mpidl: Prelude.undefined) on example input.

[huangjs]

I installed msgpack-idl 0.2.0 using cabal, and tested it using the example in README, however the command quit with code 1 and message: "mpidl: Prelude.undefined".

I tested by outputting both cpp and python, but got same error.

Here's the log:

~/tmp> mpidl cpp -o cpp -n test foo.idl -p
[MPMessage {msgName = "UserInfo", msgParam = [], msgFields = [Field {fldId = 1, fldType = TInt True 32, fldName = "uid", fldDefault = Nothing},Field {fldId = 2, fldType = TString, fldName = "name", fldDefault = Nothing},Field {fldId = 3, fldType = TNullable (TInt True 32), fldName = "flags", fldDefault = Just (LInt 1)}]},MPEnum {enumName = "Sites", enumMem = [(0,"SiteA"),(1,"SiteB"),(2,"SiteC")]},MPMessage {msgName = "LogInLog", msgParam = [], msgFields = [Field {fldId = 1, fldType = TUserDef "UserInfo" [], fldName = "user", fldDefault = Nothing},Field {fldId = 2, fldType = TUserDef "Sites" [], fldName = "site", fldDefault = Nothing}]},MPService {serviceName = "foo", serviceVersion = Nothing, serviceMethods = [Function {methodInherit = False, methodName = "login", methodRetType = TBool, methodArgs = [Field {fldId = 1, fldType = TUserDef "Sites" [], fldName = "site", fldDefault = Nothing},Field {fldId = 2, fldType = TUserDef "UserInfo" [], fldName = "user", fldDefault = Nothing}]}]}]
mpidl: Prelude.undefined

Here's the foo.idl (there was an error on line 19 in the README example):

message UserInfo {
1: int uid
2: string name
3: int? flags = 1
}

enum Sites {
0: SiteA
1: SiteB
2: SiteC
}

message LogInLog {
1: UserInfo user
2: Sites site
}

service foo {
bool login(1: Sites site, 2: UserInfo user)
}

Best,
Jianshi

[noj]

It says in the specification:
field-id specifies an index of serialized array

So, if you change all field ids to start at 0 instead of 1, it will work.

However, when mpidl encounters the nullable field flags in the first message, the C++ generator will fail, since it doesn't handle TNullable.