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diff --git a/test/fixedbugs/issue6866.go b/test/fixedbugs/issue6866.go
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+// run
+
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// WARNING: GENERATED FILE - DO NOT MODIFY MANUALLY!
+// (To generate, in go/types directory: go test -run=Hilbert -H=2 -out="h2.src")
+
+// This program tests arbitrary precision constant arithmetic
+// by generating the constant elements of a Hilbert matrix H,
+// its inverse I, and the product P = H*I. The product should
+// be the identity matrix.
+package main
+
+func main() {
+	if !ok {
+		print()
+		return
+	}
+}
+
+// Hilbert matrix, n = 2
+const (
+	h0_0, h0_1 = 1.0 / (iota + 1), 1.0 / (iota + 2)
+	h1_0, h1_1
+)
+
+// Inverse Hilbert matrix
+const (
+	i0_0 = +1 * b2_1 * b2_1 * b0_0 * b0_0
+	i0_1 = -2 * b2_0 * b3_1 * b1_0 * b1_0
+
+	i1_0 = -2 * b3_1 * b2_0 * b1_1 * b1_1
+	i1_1 = +3 * b3_0 * b3_0 * b2_1 * b2_1
+)
+
+// Product matrix
+const (
+	p0_0 = h0_0*i0_0 + h0_1*i1_0
+	p0_1 = h0_0*i0_1 + h0_1*i1_1
+
+	p1_0 = h1_0*i0_0 + h1_1*i1_0
+	p1_1 = h1_0*i0_1 + h1_1*i1_1
+)
+
+// Verify that product is identity matrix
+const ok = p0_0 == 1 && p0_1 == 0 &&
+	p1_0 == 0 && p1_1 == 1 &&
+	true
+
+func print() {
+	println(p0_0, p0_1)
+	println(p1_0, p1_1)
+}
+
+// Binomials
+const (
+	b0_0 = f0 / (f0 * f0)
+
+	b1_0 = f1 / (f0 * f1)
+	b1_1 = f1 / (f1 * f0)
+
+	b2_0 = f2 / (f0 * f2)
+	b2_1 = f2 / (f1 * f1)
+	b2_2 = f2 / (f2 * f0)
+
+	b3_0 = f3 / (f0 * f3)
+	b3_1 = f3 / (f1 * f2)
+	b3_2 = f3 / (f2 * f1)
+	b3_3 = f3 / (f3 * f0)
+)
+
+// Factorials
+const (
+	f0 = 1
+	f1 = 1
+	f2 = f1 * 2
+	f3 = f2 * 3
+)