Compiler crashes when matching on union in implicit class #2741
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Even more stuff to do with the same bug: implicit def RichResult[A](res: ResultF[A]): RichResult[A] = new RichResult(res)
sealed class RichResult[A](val res: ResultF[A]) {
def map[B](f: A => B): ResultF[B] = Result.map[A, B](res)(f)
def flatMap[B](f: A => ResultF[B]): ResultF[B] = Result.flatMap[A, B](res)(f)
}
private def map[A,B](res: ResultF[A])(f: A => B): ResultF[B] = res match {
case errs: Errors => errs
case a: A => f(a)
}
private def flatMap[A,B](res: ResultF[A])(f: A => ResultF[B]): ResultF[B] = res match {
case errs: Errors => errs
case a: A => f(a)
}The above compiles. This doesn't: + private def flatMap[A,B](res: ResultF[A])(f: A => ResultF[B]): ResultF[B] = map[A, B](res)(f)
- private def flatMap[A,B](res: ResultF[A])(f: A => ResultF[B]): ResultF[B] =
- res match {
- case errs: Errors => errs
- case a: A => f(a)
- }nor this: sealed class RichResult[A](val res: ResultF[A]) {
+ def map[B](f: A => B): ResultF[B] = Result.map(res)(f)
- def map[B](f: A => B): ResultF[B] = Result.map[A, B](res)(f)
def flatMap[B](f: A => ResultF[B]): ResultF[B] = Result.flatMap[A, B](res)(f)
}nor this: sealed class RichResult[A](val res: ResultF[A]) {
def map[B](f: A => B): ResultF[B] = Result.map[A, B](res)(f)
+ def flatMap[B](f: A => ResultF[B]): ResultF[B] = Result.flatMap(res)(f)
- def flatMap[B](f: A => ResultF[B]): ResultF[B] = Result.flatMap[A, B](res)(f)
} |
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This causes a slew of errors and as such it makes the initially presented pattern unusable :( |
felixmulder
added a commit
that referenced
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Jun 13, 2017
Fix #2741: Handle wildcard types in unions and intersections.
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The following works just fine:
The text was updated successfully, but these errors were encountered: