Stabilize Quotes defn.PolyFunction (#18480)

Author: smarter

library/src/scala/quoted/Quotes.scala

@@ -4337,7 +4337,6 @@ trait Quotes { self: runtime.QuoteUnpickler & runtime.QuoteMatching =>
       def FunctionClass(arity: Int, isContextual: Boolean): Symbol
 
       /** The `scala.PolyFunction` built-in trait. */
-      @experimental
       def PolyFunctionClass: Symbol
 
       /** Function-like object that maps arity to symbols for classes `scala.TupleX`.

project/MiMaFilters.scala

@@ -6,8 +6,8 @@ object MiMaFilters {
     // New API in 3.4.X
     ProblemFilters.exclude[ReversedMissingMethodProblem]("scala.quoted.Quotes#reflectModule.ValOrDefDefTypeTest"),
     ProblemFilters.exclude[ReversedMissingMethodProblem]("scala.quoted.Quotes#reflectModule.ValOrDefDefMethods"),
-    ProblemFilters.exclude[ReversedMissingMethodProblem]("scala.quoted.Quotes#reflectModule#defnModule.FunctionClass")
-    // New API in 3.4.X
+    ProblemFilters.exclude[ReversedMissingMethodProblem]("scala.quoted.Quotes#reflectModule#defnModule.FunctionClass"),
+    ProblemFilters.exclude[ReversedMissingMethodProblem]("scala.quoted.Quotes#reflectModule#defnModule.PolyFunctionClass"),
   )
   val TastyCore: Seq[ProblemFilter] = Seq(
     ProblemFilters.exclude[DirectMissingMethodProblem]("dotty.tools.tasty.TastyFormat.EXPLICITtpt"),

tests/run-tasty-inspector/stdlibExperimentalDefinitions.scala

@@ -89,7 +89,6 @@ val experimentalDefinitionInLibrary = Set(
   "scala.quoted.Quotes.reflectModule.MethodTypeMethods.hasErasedParams",
   "scala.quoted.Quotes.reflectModule.TermParamClauseMethods.erasedArgs",
   "scala.quoted.Quotes.reflectModule.TermParamClauseMethods.hasErasedArgs",
-  "scala.quoted.Quotes.reflectModule.defnModule.PolyFunctionClass",
 
   // New feature: reverse method on Tuple
   "scala.Tuple.reverse",