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Compile error when encode a case class

See original GitHub issue

I don’t find the reason with the bug, just provide all I know.

[enuma] $ console
[info] Starting scala interpreter...
[info] 
import scalaz._
import Scalaz._
import io.circe._
import io.circe.generic.auto._
import io.circe.jawn._
import io.circe.syntax._
Welcome to Scala version 2.11.7 (OpenJDK 64-Bit Server VM, Java 1.8.0_51).
Type in expressions to have them evaluated.
Type :help for more information.

scala> :paste
// Entering paste mode (ctrl-D to finish)

case class Aaaaa(
  id: Option[Long],
  trade111: Option[Long],
  trade222: Option[Long],
  trade333: Option[Long],
  trade444: Option[Long],
  enterprise: Option[Long]
)
case class Ccccc(name: String)
case class Bbbbb(energy: Aaaaa, street1: Ccccc, street2: Ccccc, street3: Ccccc)

//implicit val aabbcc = Encoder[Aaaaa]
val kk: Bbbbb = ???
kk.asJson

// Exiting paste mode, now interpreting.
//Tips: Here complete failed
<console>:43: error: diverging implicit expansion for type io.circe.Encoder[Bbbbb]
starting with method encodeCaseClass in trait GenericInstances
       kk.asJson
          ^

scala> :paste
// Entering paste mode (ctrl-D to finish)

case class Aaaaa(
  id: Option[Long],
  trade111: Option[Long],
  trade222: Option[Long],
  trade333: Option[Long],
  trade444: Option[Long],
  enterprise: Option[Long]
)
case class Ccccc(name: String)
case class Bbbbb(energy: Aaaaa, street1: Ccccc, street2: Ccccc, street3: Ccccc)

implicit val aabbcc = Encoder[Aaaaa]
val kk: Bbbbb = ???
kk.asJson

// Exiting paste mode, now interpreting.
//Tips: Here complete successfully
scala.NotImplementedError: an implementation is missing
  at scala.Predef$.$qmark$qmark$qmark(Predef.scala:225)
  ... 47 elided

scala> :paste
// Entering paste mode (ctrl-D to finish)

case class Aaaaa(
  id: Option[Long],
  trade111: Option[Long],
  enterprise: Option[Long]
)
case class Ccccc(name: String)
case class Bbbbb(energy: Aaaaa, street1: Ccccc, street2: Ccccc, street3: Ccccc)

//implicit val aabbcc = Encoder[Aaaaa]
val kk: Bbbbb = ???
kk.asJson

// Exiting paste mode, now interpreting.
//Tips: Here complete successfully
scala.NotImplementedError: an implementation is missing
  at scala.Predef$.$qmark$qmark$qmark(Predef.scala:225)
  ... 47 elided

scala> :paste
// Entering paste mode (ctrl-D to finish)

case class Aaaaa(
  id: Option[Long],
  trade111: Option[Long],
  enterprise: Option[Long]
)
case class Ccccc(name: String)
case class Bbbbb(energy: Aaaaa, street1: Ccccc)

//implicit val aabbcc = Encoder[Aaaaa]
val kk: Bbbbb = ???
kk.asJson

// Exiting paste mode, now interpreting.
//Tips: Here complete failed
<console>:40: error: diverging implicit expansion for type io.circe.Encoder[Bbbbb]
starting with method encodeCaseClass in trait GenericInstances
       kk.asJson
          ^

scala> :paste
// Entering paste mode (ctrl-D to finish)

case class Aaaaa(
  id: Option[Long],
  trade111: Option[Long],
  enterprise: Option[Long]
)
case class Ccccc(name: String)
case class Bbbbb(energy: Aaaaa, street1: Ccccc)

implicit val aabbcc = Encoder[Aaaaa]
val kk: Bbbbb = ???
kk.asJson

// Exiting paste mode, now interpreting.
//Tips: Here complete successfully
scala.NotImplementedError: an implementation is missing
  at scala.Predef$.$qmark$qmark$qmark(Predef.scala:225)
  ... 47 elided

scala>

It seems that sometimes I have to provide implicit val aabbcc = Encoder[Aaaaa], and it looks like that complete always successfully when I provide the implicit val aabbcc = Encoder[Aaaaa], and sometimes fail when I just type kk.asJson without implicit. Any fix or suggest?

Issue Analytics

State:
Created 8 years ago
Comments:5 (4 by maintainers)

Top GitHub Comments

1reaction

travisbrowncommented, Aug 14, 2015

Thanks for the report! I’m at a conference today but I’ll take a look this evening.

0reactions

travisbrowncommented, Aug 27, 2015

The error message situation is a little better after #43, but it doesn’t fix this and the message still isn’t great:

// Exiting paste mode, now interpreting.

<console>:38: error: could not find implicit value for parameter e: io.circe.Encoder[Bbbbb]
       kk.asJson
          ^

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