From a9fb3ba11d40aa6a9252bf53c244025d914bab11 Mon Sep 17 00:00:00 2001
From: Guillaume Martres <smarter@ubuntu.com>
Date: Thu, 19 Mar 2015 00:11:30 +0100
Subject: [PATCH] isDerivedValueClass: try to avoid causing cyclic references

This fixes the problem showcased in #412.
---
 src/dotty/tools/dotc/transform/ValueClasses.scala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/dotty/tools/dotc/transform/ValueClasses.scala b/src/dotty/tools/dotc/transform/ValueClasses.scala
index c2239e3f69c3..83f0c009dedd 100644
--- a/src/dotty/tools/dotc/transform/ValueClasses.scala
+++ b/src/dotty/tools/dotc/transform/ValueClasses.scala
@@ -14,7 +14,7 @@ object ValueClasses {
 
   def isDerivedValueClass(d: SymDenotation)(implicit ctx: Context) =
     d.isClass &&
-      d.derivesFrom(defn.AnyValClass) &&
+      d.derivesFrom(defn.AnyValClass)(ctx.withPhase(d.initial.validFor.phaseId)) &&
       (d.symbol ne defn.AnyValClass) &&
       !d.isPrimitiveValueClass