re PR c++/28110 (ICE with invalid template constant parameter)

	PR c++/28110
	* pt.c (unify) <case TEMPLATE_PARM_INDEX>: Check for invalid
	parameters.

	* g++.dg/template/crash53.C: New test.

From-SVN: r114885

gcc/cp/ChangeLog

 2006-06-22  Volker Reichelt  <reichelt@igpm.rwth-aachen.de>
 
+	PR c++/28110
+	* pt.c (unify) <case TEMPLATE_PARM_INDEX>: Check for invalid
+	parameters.
+
 	PR c++/28109
 	* rtti.c (get_tinfo_decl_dynamic): Robustify.
 

gcc/cp/pt.c

@@ -10281,6 +10281,8 @@ unify (tree tparms, tree targs, tree parm, tree arg, int strict)
 
     case TEMPLATE_PARM_INDEX:
       tparm = TREE_VALUE (TREE_VEC_ELT (tparms, 0));
+      if (tparm == error_mark_node)
+	return 1;
 
       if (TEMPLATE_PARM_LEVEL (parm)
 	  != template_decl_level (tparm))

gcc/testsuite/ChangeLog

 2006-06-22  Volker Reichelt  <reichelt@igpm.rwth-aachen.de>
 
+	PR c++/28110
+	* g++.dg/template/crash53.C: New test.
+
 	PR c++/28109
 	* g++.dg/rtti/incomplete1.C: New test.
 

gcc/testsuite/g++.dg/template/crash53.C

+// PR c++/28110
+// { dg-do compile }
+
+template<int> struct A {};
+
+template<typename T> struct B
+{
+  template<T I> B(A<I>);  // { dg-error "template constant parameter" }
+};
+
+B<double> a=A<0>();  // { dg-error "non-scalar type" }