--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/template/crash107.C	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,18 @@
+// PR c++/44625
+// { dg-do compile }
+// { dg-options "" }
+
+template<typename FP_> struct Vec { // { dg-message "note" }
+    Vec& operator^=(Vec& rhs)     {
+        union {
+            struct {FP_ x,y,z;};
+        }; // { dg-error "anonymous struct" }
+        X = y*rhs.z() - z*rhs.y(); // { dg-error "not declared|no member" }
+    }
+    Vec& operator^(Vec& rhs) {
+        return Vec(*this)^=rhs; // { dg-message "required" }
+    }
+};
+Vec<double> v(3,4,12); // { dg-error "no matching" }
+Vec<double> V(12,4,3);  // { dg-error "no matching" }
+Vec<double> c = v^V;   // { dg-message "required" }