crypto/rand: Example for Read.
crypto/rand: Example for Read.

R=adg, remyoudompheng, rsc, r
CC=golang-dev
http://codereview.appspot.com/6457085

Committer: Andrew Gerrand <395a7d33bec8475c9b83b7d440f141bcbd994aa5@golang.org>

dsriram/golang,apparentlymart/golang,pombredanne/go-deleteme,tv42/old-go,tv42/old-go,pombredanne/go-deleteme,tv42/old-go,apparentlymart/golang,dsriram/golang,gnanderson/go,tv42/old-go,gnanderson/go,dsriram/golang,dsriram/golang,gnanderson/go,pombredanne/go-deleteme,pombredanne/go-deleteme,gnanderson/go,pombredanne/go-deleteme,apparentlymart/golang,tv42/old-go,pombredanne/go-deleteme,tv42/old-go,pombredanne/go-deleteme,apparentlymart/golang,apparentlymart/golang,dsriram/golang,tv42/old-go,apparentlymart/golang,gnanderson/go,dsriram/golang,gnanderson/go,apparentlymart/golang,dsriram/golang,gnanderson/go