re PR c++/27315 (ICE with ill-placed expression)

	PR c++/27315
	* pt.c (do_decl_instantiation): Return early on invalid decl.

	* g++.dg/template/operator6.C: New test.
	* g++.dg/template/incomplete3.C: New test.

From-SVN: r113778

gcc/cp/ChangeLog

 2006-05-15  Volker Reichelt  <reichelt@igpm.rwth-aachen.de>
 
+	PR c++/27315
+	* pt.c (do_decl_instantiation): Return early on invalid decl.
+
 	PR c++/27559
 	* pt.c (push_template_decl_real): Return error_mark_node instead
 	of broken decl.

gcc/cp/pt.c

@@ -11215,7 +11215,7 @@ do_decl_instantiation (tree decl, tree storage)
   tree result = NULL_TREE;
   int extern_p = 0;
 
-  if (!decl)
+  if (!decl || decl == error_mark_node)
     /* An error occurred, for which grokdeclarator has already issued
        an appropriate message.  */
     return;

gcc/testsuite/ChangeLog

 2006-05-15  Volker Reichelt  <reichelt@igpm.rwth-aachen.de>
 
+	PR c++/27315
+	* g++.dg/template/operator6.C: New test.
+	* g++.dg/template/incomplete3.C: New test.
+
 	PR c++/27559
 	* g++.dg/template/new4.C: New test.
 

gcc/testsuite/g++.dg/template/incomplete3.C

+// PR c++/27315
+// { dg-do compile }
+
+struct A;                  // { dg-error "forward declaration" }
+template void A::foo<0>(); // { dg-error "before|incomplete" }

gcc/testsuite/g++.dg/template/operator6.C

+// PR c++/27315
+// { dg-do compile }
+
+template void operator+; // { dg-error "non-function" }