Scala 3 TypeRepr 匹配更高级的类型

Question

如何正确模式匹配 TypeRepr在更高级的类型上？ Existentials 成功匹配类，但是当我尝试使用类型时，我收到编译器错误 unreducible application of higher-kinded type writetype.Foo to wildcard arguments

import scala.quoted.*

type Foo[X]
class Bar[X]

inline def writeType[T]: String = ${writeTypeImpl[T]}

def writeTypeImpl[T](using Type[T], Quotes): Expr[String] =
  import quotes.reflect.*
  val tpe = TypeRepr.of[T]
  val s = tpe.asType match
    //case '[Foo[?]] => "FooSuccess"
    case '[Bar[?]] => "BarSuccess"
    case _ => "Fail"

  Expr(s)

Answer 1

这是您需要的答案:
https://docs.scala-lang.org/scala3/guides/migration/incompat-other-changes.html#wildcard-type-argument
您必须使用 trait或 abstract class或 Foo[A]其中是具体类型(或类型参数)