tree f3fbf018ba21cf0bea72f905bd9ea4f958bfdf38
parent 987e1198dbc4981a72e2815beb87e8d76fff718a
author Rob Pike <r@golang.org> 1265329405 +1100
committer Rob Pike <r@golang.org> 1265329405 +1100
golang-hg 3c304a2dbfbc2f94769e87b7bfb4bb670323bb0a

handle nils safely in Printf.
add some tests for erroneous formats.

R=rsc
CC=golang-dev
https://golang.org/cl/201058