Make TypeTest.unapply conditionally irrefutable

Co-authored-by: Nicolas Stucki <[email protected]>

Author: 2 people

compiler/src/dotty/tools/dotc/core/Definitions.scala

@@ -923,7 +923,6 @@ class Definitions {
   @tu lazy val FunctionalInterfaceAnnot: ClassSymbol = requiredClass("java.lang.FunctionalInterface")
   @tu lazy val TargetNameAnnot: ClassSymbol = requiredClass("scala.annotation.targetName")
   @tu lazy val VarargsAnnot: ClassSymbol = requiredClass("scala.annotation.varargs")
-  @tu lazy val CoversAnnot: ClassSymbol = requiredClass("scala.annotation.covers")
 
   @tu lazy val JavaRepeatableAnnot: ClassSymbol = requiredClass("java.lang.annotation.Repeatable")