Fix #10980

scala · Oct 3, 2022 · 1eee2e0 · 1eee2e0
1 parent bfa32a4
commit 1eee2e0
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Showing 2 changed files with 12 additions and 1 deletion.
diff --git a/compiler/src/dotty/tools/dotc/core/TypeComparer.scala b/compiler/src/dotty/tools/dotc/core/TypeComparer.scala
@@ -1955,9 +1955,11 @@ class TypeComparer(@constructorOnly initctx: Context) extends ConstraintHandling
         isSubInfo(info1, tp2.refinedInfo.widenExpr, m.symbol.info.orElse(info1))
         || matchAbstractTypeMember(m.info)
 
-      tp1.member(name) match // inlined hasAltWith for performance
+      def memberQualifies = tp1.member(name) match // inlined hasAltWith for performance
         case mbr: SingleDenotation => qualifies(mbr)
         case mbr => mbr hasAltWith qualifies
+
+      memberQualifies || (tp1.isStable && isSub(TermRef(tp1, name), tp2.refinedInfo))
     }
 
   final def ensureStableSingleton(tp: Type): SingletonType = tp.stripTypeVar match {

diff --git a/tests/pos/i10980.scala b/tests/pos/i10980.scala
@@ -0,0 +1,9 @@
+class A:
+  val x: AnyRef = Object()
+  val y: AnyRef = Object()
+
+@main def m: Unit =
+  val a = new A
+  val b: a.x.type = a.x
+  val c: A { val x: a.x.type } = a
+  val d: A { val x: a.x.type;  val y: a.y.type } = a