--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/torture/pr68852.C	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,51 @@
+/* { dg-do compile } */
+
+struct A {
+    double x, y, z, w;
+    A() {}
+    A(double, double p2, double p3, double) : y(p2), z(p3) {}
+    void m_fn1();
+};
+
+struct B {
+    double x, y;
+};
+struct D : A {
+    D() {}
+    D(double p1, double p2, double p3, double p4) : A(p1, p2, p3, p4) {}
+};
+
+class C {
+public:
+    float _11, _12, _13, _14;
+    float _21, _22, _23, _24;
+    float _31, _32, _33, _34;
+    float _41, _42, _43, _44;
+    D m_fn2(B p1) {
+	double z(p1.x + _43);
+	return *this * D(p1.x, p1.y, z, 1);
+    }
+    int ProjectRectBounds_next;
+    B __trans_tmp_3;
+    int m_fn3(int) {
+	B a, b;
+	D c[1];
+	b = __trans_tmp_3;
+	c[2] = m_fn2(b);
+	c[3] = m_fn2(a);
+	c[ProjectRectBounds_next].m_fn1();
+    }
+    D operator*(D p1) {
+	D d;
+	d.x = p1.x * _11 + p1.y * _21 + p1.z * _31 + _41;
+	d.y = p1.x * _12 + p1.y * _22 + p1.z * _32 + _42;
+	d.z = p1.x * _13 + p1.y * _23 + p1.z * _33 + _43;
+	d.w = p1.x * _14 + p1.y * _24 + p1.z * _34 + _44;
+	return d;
+    }
+};
+
+void fn1() {
+    C e;
+    int f = e.m_fn3(f);
+}