math/rand: fix typo and add better crash message

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/9000043

diff --git a/src/pkg/math/rand/zipf.go b/src/pkg/math/rand/zipf.go
index 38e8ec5162acecaacc906744226f134ea53402b5..8db2c6f5bffe2db7f5dafcc8dc119932dd487ab9 100644 (file)
--- a/src/pkg/math/rand/zipf.go
+++ b/src/pkg/math/rand/zipf.go
@@ -34,7 +34,6 @@ func (z *Zipf) hinv(x float64) float64 {
 
 // NewZipf returns a Zipf generating variates p(k) on [0, imax]
 // proportional to (v+k)**(-s) where s>1 and k>=0, and v>=1.
-//
 func NewZipf(r *Rand, s float64, v float64, imax uint64) *Zipf {
        z := new(Zipf)
        if s <= 1.0 || v < 1 {
@@ -52,9 +51,12 @@ func NewZipf(r *Rand, s float64, v float64, imax uint64) *Zipf {
        return z
 }
 
-// Uint64 returns a value drawn from the Zipf distributed described
+// Uint64 returns a value drawn from the Zipf distribution described
 // by the Zipf object.
 func (z *Zipf) Uint64() uint64 {
+       if z == nil {
+               panic("rand: nil Zipf")
+       }
        k := 0.0
 
        for {