http://d.puremagic.com/issues/show_bug.cgi?id=6230



--- Comment #1 from kenn...@gmail.com 2011-06-30 09:50:12 PDT ---
One possible patch:



diff --git a/src/expression.c b/src/expression.c
index 57cdd61..71f6239 100644
--- a/src/expression.c
+++ b/src/expression.c
@@ -1366,17 +1366,23 @@ void Expression::checkPurity(Scope *sc, VarDeclaration
*v, Expression *ethis)
              * requiring each function in between to be impure.
              */
             Dsymbol *vparent = v->toParent2();
-            for (Dsymbol *s = sc->func; s; s = s->toParent2())
+            Dsymbol *s = sc->func, *snext = s->toParent2();
+            // Make sure we're really finding parent *functions*, not parent
+            // class.
+            if (vparent->isFuncDeclaration() || snext != vparent)
             {
-                if (s == vparent)
-                    break;
-                FuncDeclaration *ff = s->isFuncDeclaration();
-                if (!ff)
-                    break;
-                if (ff->setImpure())
-                {   error("pure nested function '%s' cannot access mutable
data '%s'",
-                        ff->toChars(), v->toChars());
-                    break;
+                for (; s; s = s->toParent2())
+                {
+                    if (s == vparent)
+                        break;
+                    FuncDeclaration *ff = s->isFuncDeclaration();
+                    if (!ff)
+                        break;
+                    if (ff->setImpure())
+                    {   error("pure nested function '%s' cannot access mutable
data '%s'",
+                            ff->toChars(), v->toChars());
+                        break;
+                    }
                 }
             }
         }
diff --git a/src/func.c b/src/func.c
index 9957d7f..1cccbed 100644
--- a/src/func.c
+++ b/src/func.c
@@ -2664,9 +2664,9 @@ enum PURE FuncDeclaration::isPure()
     TypeFunction *tf = (TypeFunction *)type;
     if (flags & FUNCFLAGpurityInprocess)
         setImpure();
-    enum PURE purity = tf->purity;
-    if (purity == PUREfwdref)
+    if (tf->purity == PUREfwdref)
         tf->purityLevel();
+    enum PURE purity = tf->purity;
     if (purity > PUREweak && needThis())
     {   // The attribute of the 'this' reference affects purity strength
         if (type->mod & (MODimmutable | MODwild))
@@ -2676,6 +2676,9 @@ enum PURE FuncDeclaration::isPure()
         else
             purity = PUREweak;
     }
+    tf->purity = purity;
+    // ^ This rely on the current situation that every FuncDeclaration has a
+    //   unique TypeFunction.
     return purity;
 }

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