From f732e88f18bf53787ba6850bb62b279e1166a96b Mon Sep 17 00:00:00 2001
From: Nicolas Stucki <nicolas.stucki@gmail.com>
Date: Tue, 3 Nov 2020 10:24:18 +0100
Subject: [PATCH] Fix #10143: Handle shared package references

---
 .../dotc/core/tasty/TastyClassName.scala      | 21 +++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)

diff --git a/compiler/src/dotty/tools/dotc/core/tasty/TastyClassName.scala b/compiler/src/dotty/tools/dotc/core/tasty/TastyClassName.scala
index 12e8a60c5a28..c4283bb43473 100644
--- a/compiler/src/dotty/tools/dotc/core/tasty/TastyClassName.scala
+++ b/compiler/src/dotty/tools/dotc/core/tasty/TastyClassName.scala
@@ -25,10 +25,6 @@ class TastyClassName(bytes: Array[Byte]) {
     import dotty.tools.tasty.TastyFormat._
     def unpickle(reader: TastyReader, tastyName: NameTable): (TermName, TermName) = {
       import reader._
-      def readName() = {
-        val idx = readNat()
-        nameAtRef(NameRef(idx))
-      }
       def readNames(packageName: TermName): (TermName, TermName) = {
         val tag = readByte()
         if (tag >= firstLengthTreeTag) {
@@ -36,7 +32,7 @@ class TastyClassName(bytes: Array[Byte]) {
           val end = currentAddr + len
           tag match {
             case TYPEDEF =>
-              val className = readName()
+              val className = reader.readName()
               goto(end)
               (packageName, className)
             case IMPORT | VALDEF =>
@@ -48,7 +44,14 @@ class TastyClassName(bytes: Array[Byte]) {
         }
         else tag match {
           case TERMREFpkg | TYPEREFpkg =>
-            val subPackageName = readName()
+            val subPackageName = reader.readName()
+            readNames(subPackageName)
+          case SHAREDtype =>
+            val addr = reader.readAddr()
+            val reader2 = reader.subReader(addr, reader.endAddr)
+            val tag2 = reader2.readByte()
+            assert(tag2 == TERMREFpkg || tag2 == TYPEREFpkg)
+            val subPackageName = reader2.readName()
             readNames(subPackageName)
           case _ =>
             readNames(packageName)
@@ -56,5 +59,11 @@ class TastyClassName(bytes: Array[Byte]) {
       }
       readNames(nme.EMPTY_PACKAGE)
     }
+
+    extension (reader: TastyReader) def readName() = {
+      val idx = reader.readNat()
+      nameAtRef(NameRef(idx))
+    }
   }
+
 }