Alternative fix based on tpd.desugarIdent

Author: odersky

compiler/src/dotty/tools/backend/jvm/BCodeBodyBuilder.scala

@@ -390,7 +390,7 @@ trait BCodeBodyBuilder extends BCodeSkelBuilder {
           def genLoadQualUnlessElidable(): Unit = { if (!qualSafeToElide) { genLoadQualifier(tree) } }
 
           // receiverClass is used in the bytecode to access the field. using sym.owner may lead to IllegalAccessError
-          def receiverClass = qualifier.tpe.widenTermRefExpr.finalResultType.typeSymbol
+          def receiverClass = qualifier.tpe.typeSymbol
           if (sym.is(Module)) {
             genLoadQualUnlessElidable()
             genLoadModule(tree)

compiler/src/dotty/tools/dotc/ast/tpd.scala

@@ -1383,7 +1383,11 @@ object tpd extends Trees.Instance[Type] with TypedTreeInfo {
   /** Recover identifier prefix (e.g. this) if it exists */
   def desugarIdentPrefix(tree: Ident)(using Context): Tree = tree.tpe match {
     case TermRef(prefix: TermRef, _) =>
-      ref(prefix)
+      prefix.info match
+        case mt: MethodType if mt.paramInfos.isEmpty && mt.resultType.typeSymbol.is(Module) =>
+          ref(mt.resultType.typeSymbol.sourceModule)
+        case _ =>
+          ref(prefix)
     case TermRef(prefix: ThisType, _) =>
       This(prefix.cls)
     case _ =>