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diff --git a/dimension/tests/directives.pov b/dimension/tests/directives.pov
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+/*************************************************************************
+ * Copyright (C) 2009-2010 Tavian Barnes <tavianator@tavianator.com>     *
+ *                                                                       *
+ * This file is part of The Dimension Test Suite.                        *
+ *                                                                       *
+ * The Dimension Test Suite is free software; you can redistribute it    *
+ * and/or modify it under the terms of the GNU General Public License as *
+ * published by the Free Software Foundation; either version 3 of the    *
+ * License, or (at your option) any later version.                       *
+ *                                                                       *
+ * The Dimension Test Suite is distributed in the hope that it will be   *
+ * useful, but WITHOUT ANY WARRANTY; without even the implied warranty   *
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU  *
+ * General Public License for more details.                              *
+ *                                                                       *
+ * You should have received a copy of the GNU General Public License     *
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>. *
+ *************************************************************************/
+
+// Test the language directives
+
+#version 3.6;
+
+#debug "debug"
+#warning "warning"
+
+#include "directives.inc"
+
+#declare R = 1;
+#local Color = rgb <1, 0, 1>;
+
+#declare Unused = -1;
+#undef Unused
+
+#ifdef (Local)
+  #error "Local escaped from include file"
+#end
+
+#ifdef (Unused)
+  #error "#undef failed"
+#end
+
+#macro Make_Sphere(n)
+  sphere {
+    Center + <0, n, 0>, R
+    pigment {
+      color Color green 1
+    }
+  }
+#end
+
+#macro Inc(n)
+  #declare n = n + 1;
+#end
+
+#declare Counter = 0;
+#while (Counter < 2)
+  #if (#if (1 = 1) 0 #end = 0 & !1)
+    #error "Nested #if parsing failed"
+  #else
+    Make_Sphere(Counter)
+  #end
+
+  Inc(Counter)
+#end
+
+// Test macro parameters with the same name as existing variables
+#declare Test1 = 0;
+#declare Test2 = 1;
+#declare Test3 = 2;
+#macro ScopeTest(Test1, Test2, Test3)
+  #declare Test1 = Test2 - Test3;
+#end
+ScopeTest(Test1, Test3, Test2)
+sphere {
+  0, Test1
+}
+
+#declare Box =
+  box {
+    <-1, -1, -1>, <1, 1, 1>
+    pigment {
+      color rgb <1, 1, 1>
+    }
+  }
+
+object {
+  Box
+  finish {
+    phong 0.2
+  }
+}