Split scopes into immutable and mutable parts.

The goal is that symbols should be entered/deleted directly into classes instead of their scopes. This is necesaary so that invariant about fingerPrint can be maintained. We achieve it by making the info scope have immutable type, so an explicit cast is needed to get around that.

1 files changed, 3 insertions, 3 deletions

diff --git a/src/dotty/tools/dotc/core/pickling/UnPickler.scala b/src/dotty/tools/dotc/core/pickling/UnPickler.scala
index 9edc8cb84..55ed9b63d 100644
--- a/src/dotty/tools/dotc/core/pickling/UnPickler.scala
+++ b/src/dotty/tools/dotc/core/pickling/UnPickler.scala
@@ -24,7 +24,7 @@ object UnPickler {
   case class TempPolyType(tparams: List[Symbol], tpe: Type) extends UncachedGroundType
 
   /** Temporary type for classinfos, will be decomposed on completion of the class */
-  case class TempClassInfoType(parentTypes: List[Type], decls: Scope, clazz: Symbol) extends UncachedGroundType
+  case class TempClassInfoType(parentTypes: List[Type], decls: MutableScope, clazz: Symbol) extends UncachedGroundType
 
   def depoly(tp: Type)(implicit ctx: Context): Type = tp match {
     case TempPolyType(tparams, restpe) => PolyType.fromSymbols(tparams, restpe)
@@ -356,7 +356,7 @@ class UnPickler(bytes: Array[Byte], classRoot: ClassDenotation, moduleRoot: Clas
         isUnpickleRoot(sym) ||
         (sym is (ModuleClass | TypeParam | Scala2Existential)) ||
         isRefinementClass(sym)))
-        symScope(sym.owner) enter sym
+        symScope(sym.owner).openForMutations.enter(sym)
       sym
     }
 
@@ -519,7 +519,7 @@ class UnPickler(bytes: Array[Byte], classRoot: ClassDenotation, moduleRoot: Clas
         }
       case CLASSINFOtpe =>
         val clazz = readSymbolRef()
-        TempClassInfoType(until(end, readTypeRef), symScope(clazz), clazz)
+        TempClassInfoType(until(end, readTypeRef), symScope(clazz).openForMutations, clazz)
       case METHODtpe | IMPLICITMETHODtpe =>
         val restpe = readTypeRef()
         val params = until(end, readSymbolRef)