Make TrustedTypeTestKey sticky

Author: abgruszecki

compiler/src/dotty/tools/dotc/transform/PatternMatcher.scala

@@ -16,7 +16,7 @@ import NameKinds.{PatMatStdBinderName, PatMatAltsName, PatMatResultName}
 import config.Printers.patmatch
 import reporting.diagnostic.messages._
 import dotty.tools.dotc.ast._
-import util.Property.Key
+import util.Property._
 
 /** The pattern matching transform.
  *  After this phase, the only Match nodes remaining in the code are simple switches
@@ -53,7 +53,7 @@ object PatternMatcher {
   /** Minimal number of cases to emit a switch */
   final val MinSwitchCases = 4
 
-  object TrustedTypeTestKey extends Key[Unit]
+  val TrustedTypeTestKey: Key[Unit] = new StickyKey[Unit]
 
   /** Was symbol generated by pattern matcher? */
   def isPatmatGenerated(sym: Symbol)(implicit ctx: Context): Boolean =