Backport "Also compute base classes of wildcardTypes" to LTS (#20836)

Backports #19465 to the LTS branch. PR submitted by the release tooling. [skip ci]
scala · Jun 28, 2024 · e4e2ffe · e4e2ffe
2 parents 1053113 + 97735ed
commit e4e2ffe
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diff --git a/compiler/src/dotty/tools/dotc/core/Types.scala b/compiler/src/dotty/tools/dotc/core/Types.scala
@@ -640,6 +640,8 @@ object Types extends TypeUtils {
             tp.superType.baseClasses
           case tp: ClassInfo =>
             tp.cls.classDenot.baseClasses
+          case tp: WildcardType =>
+            tp.effectiveBounds.hi.baseClasses
           case _ => Nil
       catch case ex: Throwable =>
         handleRecursive("base classes of", this.show, ex)

diff --git a/tests/pos/i19460.scala b/tests/pos/i19460.scala
@@ -0,0 +1,5 @@
+type T[A] = A | Any
+
+def perform[A](using T[A]): A = perform2
+
+def perform2[A](using T[A]): A = ???