What does 'go version' print?
go version devel +2b85dda01af0 Wed Mar 19 10:14:04 2014 -0700 linux/amd64

What happened?
$ go tool vet
loop:  48 57 0 47       <-- what are these lines?
loop:  65 90 58 64
loop:  97 122 91 96
loop:  41 41 0 40
loop:  41 41 0 40
loop:  10 10 0 9
loop:  40 40 0 39
loop:  43 43 0 42
loop:  45 45 44 44
loop:  48 57 46 47
loop:  44 44 0 43
Usage of vet:
        vet [flags] directory...
        vet [flags] files... # Must be a single package
For more information run
        godoc code.google.com/p/go.tools/cmd/vet
...