re PR c++/48749 (internal compiler error: tree check: expected field_decl)

	PR c++/48749
	* class.c (resolves_to_fixed_type_p): Don't look closely
	in templates.

From-SVN: r173412

gcc/cp/ChangeLog

+2011-05-04  Jason Merrill  <jason@redhat.com>
+
+	PR c++/48749
+	* class.c (resolves_to_fixed_type_p): Don't look closely
+	in templates.
+
 2011-05-03  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/28501

gcc/cp/class.c

@@ -5980,7 +5980,17 @@ resolves_to_fixed_type_p (tree instance, int* nonnull)
 {
   tree t = TREE_TYPE (instance);
   int cdtorp = 0;
-  tree fixed = fixed_type_or_null (instance, nonnull, &cdtorp);
+  tree fixed;
+
+  if (processing_template_decl)
+    {
+      /* In a template we only care about the type of the result.  */
+      if (nonnull)
+	*nonnull = true;
+      return true;
+    }
+
+  fixed = fixed_type_or_null (instance, nonnull, &cdtorp);
   if (fixed == NULL_TREE)
     return 0;
   if (POINTER_TYPE_P (t))

gcc/testsuite/ChangeLog

+2011-05-04  Jason Merrill  <jason@redhat.com>
+
+	* g++.dg/conversion/base1.C: New.
+
 2011-05-04  Jerry DeLisle  <jvdelisle@gcc.gnu.org>
 
 	PR libgfortran/48787

gcc/testsuite/g++.dg/conversion/base1.C

+// PR c++/48749
+
+struct Tuple3
+{
+  float x;
+};
+
+struct Pos: virtual Tuple3 { };
+
+struct TexCoords
+{
+  Pos pos;
+};
+
+template <class T>
+void eval (const TexCoords &coords)
+{
+  const Pos &pos = coords.pos;
+  pos.x;
+}