test fix

Author: soronpo

presentation-compiler/src/main/dotty/tools/pc/completions/Completions.scala

@@ -110,10 +110,14 @@ class Completions(
 
     def isLanguageExperimental: Boolean =
       val n = sym.fullName.show
-      n.contains(".language.experimental.") || n.endsWith(".language.experimental")
+      n.contains(".language.experimental.") || n.endsWith(".language.experimental") ||
+        n.contains("stdLibPatches.language.experimental")
+
+    def isExperimentalEndMarkersByName: Boolean =
+      sym.decodedName == "methodBlockEndMarkers" && sym.maybeOwner.fullName.show.contains("language.experimental")
 
     val excludeLanguageExperimental =
-      !completionMode.is(Mode.ImportOrExport) && isLanguageExperimental
+      !completionMode.is(Mode.ImportOrExport) && (isLanguageExperimental || isExperimentalEndMarkersByName)
 
     if generalExclude || excludeLanguageExperimental then false
     else if completionMode.is(Mode.Type) then true
@@ -597,7 +601,10 @@ class Completions(
           // They are still available in import positions.
           {
             val n = sym.fullName.show
-            !n.contains(".language.experimental.") && !n.endsWith(".language.experimental")
+            val isExp = n.contains(".language.experimental.") || n.endsWith(".language.experimental") ||
+              n.contains("stdLibPatches.language.experimental") ||
+              (sym.decodedName == "methodBlockEndMarkers" && sym.maybeOwner.fullName.show.contains("language.experimental"))
+            !isExp
           } &&
           !(sym.is(Flags.ExtensionMethod) || (sym.maybeOwner.is(Flags.Implicit) && sym.maybeOwner.isClass))
         then