PR c++/6620

	* pt.c (verify_class_unification): Don't check if PARM is template
	parameter dependent.  Simplify.
	(unify) [TEMPLATE_PARM_INDEX]: Handle when ARG is a template
	parameter dependent expression.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@53517 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 36 insertions, 0 deletions

diff --git a/gcc/testsuite/g++.dg/template/partial1.C b/gcc/testsuite/g++.dg/template/partial1.C
new file mode 100644
index 00000000000..41ea5303969
--- /dev/null
+++ b/gcc/testsuite/g++.dg/template/partial1.C
@@ -0,0 +1,36 @@
+// { dg-do run }
+// Origin: Jo Totland <jototland@hotmail.com>
+
+// PR c++/6620
+// Partial specialization involving expression of non-type template
+// parameter causes ICE.
+
+extern "C" void abort();
+
+template <int N> struct HoldInt
+{
+};
+
+template <class A, class B> struct Add
+{
+};
+
+template <int N> struct Add<HoldInt<N>, HoldInt<-N> >
+{
+  typedef int type;
+  int f() { return 0; }
+};
+
+template <int N, int M> 
+struct Add<HoldInt<N>, HoldInt<M> >
+{
+  typedef HoldInt<N+M> type;
+  int f() { return 1; }
+};
+
+int main() {
+  Add<HoldInt<1>, HoldInt<-1> > a;
+  Add<HoldInt<1>, HoldInt<-2> > b;
+  if (a.f() != 0 || b.f() != 1)
+    abort();
+}