re PR c++/42055 (ICE with ambiguous template specialization)

cp/
2009-11-16  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/42055
	* pt.c (determine_specialization): Assign to candidates the return
	value of the chainon called before print_candidates.

testsuite/
2009-11-16  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/42055
	* testsuite/g++.dg/template/crash92.C: New.

From-SVN: r154202

gcc/cp/ChangeLog

 2009-11-16  Paolo Carlini  <paolo.carlini@oracle.com>
 
+	PR c++/42055
+	* pt.c (determine_specialization): Assign to candidates the return
+	value of the chainon called before print_candidates.
+
+2009-11-16  Paolo Carlini  <paolo.carlini@oracle.com>
+
 	PR c++/32056
 	* decl.h (enum decl_context): Add TPARM enumerator.
 	* decl.c (grokdeclarator): Per 14.1/2, error out if a storage class

gcc/cp/pt.c

@@ -1941,7 +1941,7 @@ determine_specialization (tree template_id,
     {
       error ("ambiguous template specialization %qD for %q+D",
 	     template_id, decl);
-      chainon (candidates, templates);
+      candidates = chainon (candidates, templates);
       print_candidates (candidates);
       return error_mark_node;
     }

gcc/testsuite/ChangeLog

 2009-11-16  Paolo Carlini  <paolo.carlini@oracle.com>
 
+	PR c++/42055
+	* testsuite/g++.dg/template/crash92.C: New.
+
+2009-11-16  Paolo Carlini  <paolo.carlini@oracle.com>
+
 	PR c++/32056
 	* testsuite/g++.dg/template/error44.C: New.
 

gcc/testsuite/g++.dg/template/crash92.C

+// PR c++/42055
+
+template<typename T> void foo(T, T); // { dg-error "candidates|template" }
+
+template<typename T> void foo(T, int); // { dg-error "template" }
+
+template void foo(int, int); // { dg-error "ambiguous template specialization" }