Merge pull request #11429 from dotty-staging/fix-11421

Skip overloaded methods when looking for an extractor

Author: liufengyun

compiler/src/dotty/tools/dotc/typer/Typer.scala

@@ -158,7 +158,8 @@ class Typer extends Namer
      */
     def qualifies(denot: Denotation): Boolean =
       reallyExists(denot)
-      && !(pt.isInstanceOf[UnapplySelectionProto] && denot.symbol.is(Method, butNot = Accessor))
+      && (!pt.isInstanceOf[UnapplySelectionProto]
+          || denot.hasAltWith(sd => !sd.symbol.is(Method, butNot = Accessor)))
       && !denot.symbol.is(PackageClass)
 
     /** Find the denotation of enclosing `name` in given context `ctx`.

tests/pos/i11421.scala

@@ -0,0 +1,9 @@
+class Foo {
+  def ::(hd: String): Foo = ???
+  def ::(hd: Boolean): Foo  = ???
+
+  List(1, 2) match {
+    case x :: tail => ()
+    case _ => ()
+  }
+}