From f4e9a881a561e28900becc7deea520b43e57fb31 Mon Sep 17 00:00:00 2001
From: Martin Odersky <odersky@gmail.com>
Date: Sun, 9 Feb 2014 13:35:17 +0100
Subject: WIP: Fixes to bring symbols forward

---
 src/dotty/tools/dotc/core/Denotations.scala | 27 +++++++++++++++------------
 1 file changed, 15 insertions(+), 12 deletions(-)

(limited to 'src/dotty/tools/dotc/core/Denotations.scala')

diff --git a/src/dotty/tools/dotc/core/Denotations.scala b/src/dotty/tools/dotc/core/Denotations.scala
index 2ad193970..356e68f72 100644
--- a/src/dotty/tools/dotc/core/Denotations.scala
+++ b/src/dotty/tools/dotc/core/Denotations.scala
@@ -461,6 +461,18 @@ object Denotations {
       current
     }
 
+    protected def bringForward()(implicit ctx: Context): SingleDenotation = this match {
+      case denot: SymDenotation if ctx.stillValid(denot) =>
+        var d: SingleDenotation = denot
+        do {
+          d.validFor = Period(ctx.period.runId, d.validFor.firstPhaseId, d.validFor.lastPhaseId)
+          d = d.nextInRun
+        } while (d ne denot)
+        initial.copyIfParentInvalid
+      case _ =>
+        staleSymbolError
+    }
+
     /** Produce a denotation that is valid for the given context.
      *  Usually called when !(validFor contains ctx.period)
      *  (even though this is not a precondition).
@@ -476,17 +488,6 @@ object Denotations {
     def current(implicit ctx: Context): SingleDenotation = {
       val currentPeriod = ctx.period
       val valid = myValidFor
-      def bringForward(): SingleDenotation = this match {
-        case denot: SymDenotation if ctx.stillValid(denot) =>
-          var d: SingleDenotation = denot
-          do {
-            d.validFor = Period(currentPeriod.runId, d.validFor.firstPhaseId, d.validFor.lastPhaseId)
-            d = d.nextInRun
-          } while (d ne denot)
-          initial.copyIfParentInvalid
-        case _ =>
-          staleSymbolError
-      }
       if (valid.runId != currentPeriod.runId) bringForward.current
       else {
         var cur = this
@@ -530,7 +531,7 @@ object Denotations {
     }
 
     def staleSymbolError(implicit ctx: Context) =
-      throw new Error(s"stale symbol; $this, defined in run ${myValidFor.runId} is referred to in run ${ctx.period.runId}")
+      throw new StaleSymbol(s"stale symbol; $this, defined in run ${myValidFor.runId} is referred to in run ${ctx.period.runId}")
 
     /** For ClassDenotations only:
      *  If caches influenced by parent classes are still valid, the denotation
@@ -757,5 +758,7 @@ object Denotations {
       else
         NoSymbol
   }
+
+  class StaleSymbol(msg: String) extends Exception(msg)
 }
 
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