by mpimenov@google.com:

This is due to a recent change in text/template


% go version
go version weekly.2012-02-14 +8fb6ce52511d
% go
Go is a tool for managing Go source code.

Usage: go command [arguments]

The commands are:
panic: template: top:6: wrong number of args for Run: want 2 got 0

goroutine 1 [running]:
main.tmpl(0xf84007c240, 0xf840091010, 0x712f2c, 0x195, 0x59c248, ...)
    ~/go/src/cmd/go/main.go:185 +0x28d
main.printUsage(0xf84007c240, 0xf840091010)
    ~/go/src/cmd/go/main.go:198 +0x9a
main.usage()
    ~/go/src/cmd/go/main.go:202 +0x4c
main.main()
    ~/go/src/cmd/go/main.go:109 +0xa0