C++ PATCH for c++/61647 (ICE with call to conversion op)

[Jason Merrill]

We were missing a way the function being called can be dependent.

Tested x86_64-pc-linux-gnu, applying to 4.8, 4.9, trunk.

commit 687aa57720473c7962c9eb9cf79c67cf068ba005
Author: Jason Merrill <ja...@redhat.com>
Date:   Mon Jun 30 13:50:38 2014 -0400

    	PR c++/61647
    	* pt.c (type_dependent_expression_p): Check BASELINK_OPTYPE.

diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c
index 3ddd4b8..a188892 100644
--- a/gcc/cp/pt.c
+++ b/gcc/cp/pt.c
@@ -20011,7 +20011,12 @@ type_dependent_expression_p (tree expression)
 	return true;
 
       if (BASELINK_P (expression))
-	expression = BASELINK_FUNCTIONS (expression);
+	{
+	  if (BASELINK_OPTYPE (expression)
+	      && dependent_type_p (BASELINK_OPTYPE (expression)))
+	    return true;
+	  expression = BASELINK_FUNCTIONS (expression);
+	}
 
       if (TREE_CODE (expression) == TEMPLATE_ID_EXPR)
 	{
diff --git a/gcc/testsuite/g++.dg/template/conv14.C b/gcc/testsuite/g++.dg/template/conv14.C
new file mode 100644
index 0000000..509ae6a
--- /dev/null
+++ b/gcc/testsuite/g++.dg/template/conv14.C
@@ -0,0 +1,30 @@
+// PR c++/61647
+
+class XX;
+
+template<typename Container, typename Key>
+struct Accessor;
+
+template<typename Container, typename Key, typename KeyStore = Key>
+class Variant {
+protected:
+    KeyStore index;
+    Container state;
+public:
+    Variant(Container st, const Key& i) : index(i), state(st) {}
+
+    template<typename T>
+    operator T() const {
+        return Accessor<Container, KeyStore>::template get<T>(state, index);
+    }
+};
+
+class AutoCleanVariant : public Variant<XX*, int> {
+public:
+    AutoCleanVariant(XX* st, int i) : Variant<XX*,int>(st,i) {}
+
+    template<typename T>
+    operator T() const {
+         return Variant<XX*, int>::operator T();
+    }
+};