go packages without example files

gistfile1.txt

~/gosrc/src master ⇣
❯ for i in `go list ./... | grep -v internal | sed 's#_/Users/gonzalo/gosrc/src/##'`; do if ! [[ -f $i/example_test.go ]]; then echo $i; fi; done
builtin
cmd/addr2line
cmd/api
cmd/asm
cmd/buildid
cmd/cgo
cmd/compile
cmd/cover
cmd/dist
cmd/doc
cmd/fix
cmd/go
cmd/gofmt
cmd/link
cmd/nm
cmd/objdump
cmd/pack
cmd/pprof
cmd/test2json
cmd/trace
cmd/vet
compress/bzip2
compress/lzw
container/heap
crypto
crypto/aes
crypto/dsa
crypto/elliptic
crypto/hmac
crypto/rc4
crypto/sha512
crypto/subtle
crypto/x509/pkix
database/sql/driver
debug/dwarf
debug/elf
debug/gosym
debug/macho
debug/pe
debug/plan9obj
encoding
encoding/ascii85
encoding/asn1
expvar
go/build
go/importer
hash/adler32
hash/crc64
hash/fnv
image
image/color
image/color/palette
image/gif
image/jpeg
net/http/cgi
net/http/fcgi
net/http/pprof
net/rpc
net/rpc/jsonrpc
net/textproto
os/user
plugin
regexp/syntax
runtime/cgo
runtime/debug
runtime/pprof
runtime/race
syscall
testing
testing/iotest
testing/quick
text/template/parse
unicode/utf16
unsafe