Pickle hole targs as trees to keep positions

Author: nicolasstucki

compiler/src/dotty/tools/dotc/core/tasty/TreePickler.scala

@@ -672,9 +672,7 @@ class TreePickler(pickler: TastyPickler) {
             pickleType(tpt.tpe, richTypes = true)
             if targs.nonEmpty then
               writeByte(HOLETYPES)
-              withLength {
-                targs.foreach(targ => pickleType(targ.tpe))
-              }
+              withLength { targs.foreach(pickleTree) }
             args.foreach(pickleTree)
           }
       }

compiler/src/dotty/tools/dotc/core/tasty/TreeUnpickler.scala

@@ -1506,10 +1506,9 @@ class TreeUnpickler(reader: TastyReader,
       val targs =
         if nextByte == HOLETYPES then
           readByte()
-          val typesEnd = readEnd()
-          until(typesEnd)(readType()).map(TypeTree(_))
+          until(readEnd()) { readTpt() }
         else Nil
-      val args = until(end)(readTerm())
+      val args = until(end) { readTerm() }
       TastyQuoteHole(true, idx, targs ::: args, TypeTree(tpe)).withType(tpe)
 
     def readLater[T <: AnyRef](end: Addr, op: TreeReader => Context ?=> T)(using Context): Trees.Lazy[T] =

tasty/src/dotty/tools/tasty/TastyFormat.scala

@@ -124,7 +124,7 @@ Standard-Section: "ASTs" TopLevelStat*
                   SHAREDterm            term_ASTRef                                -- Link to previously serialized term
                   HOLE           Length idx_Nat tpe_Type HoleTypes? arg_Tree*      -- Splice hole with index `idx`, the type of the hole `tpe`, type arguments of the hole `targ`s and term arguments of the hole `arg`s
                                                                                       -- Note: From 3.0 to 3.3 `args` could contain type arguments as well. This is no longer the case.
-  HoleTypes     = HOLETYPES      Length targ_Type*
+  HoleTypes     = HOLETYPES      Length targ_Tree*