Fix #6518: Add type parameters to class type before asking for members

compiler/src/dotty/tools/dotc/tastyreflect/KernelImpl.scala

@@ -1556,7 +1556,11 @@ class KernelImpl(val rootContext: core.Contexts.Context, val rootPosition: util.
   }
 
   def ClassDefSymbol_methods(self: Symbol)(implicit ctx: Context): List[DefDefSymbol] = {
-    self.typeRef.allMembers.iterator.map(_.symbol).collect {
+    val classTpe = self.typeRef.appliedTo(self.typeParams.map { param =>
+      if (param.variance == -1) param.info.hiBound
+      else param.info.loBound
+    })
+    classTpe.allMembers.iterator.map(_.symbol).collect {
       case sym if isMethod(sym) => sym.asTerm
     }.toList
   }

tests/run-macros/i6518.check

@@ -0,0 +1,24 @@
+!=
+##
+$asInstanceOf$
+$isInstanceOf$
+==
+andThen
+apply
+asInstanceOf
+clone
+compose
+eq
+equals
+finalize
+getClass
+hashCode
+isInstanceOf
+ne
+notify
+notifyAll
+synchronized
+toString
+wait
+wait
+wait

tests/run-macros/i6518/Macro_1.scala

@@ -0,0 +1,14 @@
+import scala.quoted._
+import scala.quoted.autolift._
+import scala.tasty._
+
+object Macros {
+
+  inline def test(): String = ${ testImpl }
+
+  private def testImpl(implicit reflect: Reflection): Expr[String] = {
+    import reflect._
+    typeOf[Function1[_, _]].classSymbol.get.methods.map(_.name).sorted.mkString("\n")
+  }
+
+}

tests/run-macros/i6518/Test_2.scala

@@ -0,0 +1,8 @@
+
+object Test {
+
+  def main(args: Array[String]): Unit = {
+    println(Macros.test())
+  }
+
+}