"No TypeTag available" for type member regression #9865
Description
This example compiles using Scala 2.10.4 but not with 2.11.7
import scala.reflect.runtime.universe._
trait Parser {
type Result
def parse(s: String): Result
}
object Parser {
type TP[A] = Parser { type Result = A }
def apply[A](fn: String => A): Parser { type Result = A } =
new Parser {
override type Result = A
override def parse(s: String): Result = fn(s)
}
def register[A : TypeTag](parser: Parser.TP[A]): Unit = {
// do registration ...
}
register(Parser(_.toInt))
}[ERROR] Parser.scala:24: error: No TypeTag available for this.Result
[ERROR] register(Parser(_.toInt))
[ERROR] ^An easy workaround it to just change the change the type of apply:
def apply[A](fn: String => A): Parser.TP[A] = ...Another workaround is to specify the type parameter when calling register:
register[Int](Parser(_.toInt))