Handy inspection tool.
Defails: https://medium.com/@jondot/a-story-of-a-fat-go-binary-20edc6549b97
Source: https://github.com/jondot/goweight
$ goweight
3.3 MB runtime
1.3 MB reflect
813 kB syscall
631 kB encoding/json
452 kB time
436 kB fmt
392 kB os
266 kB strings
263 kB strconv
229 kB unicode
223 kB flag
223 kB math
199 kB bytes
194 kB internal/poll
178 kB encoding/binary
177 kB bufio
140 kB io
124 kB sync
121 kB sort
101 kB path/filepath
77 kB encoding/base64
52 kB internal/fmtsort
49 kB github.com/howeyc/crc16
40 kB internal/cpu
39 kB math/bits
27 kB unicode/utf8
19 kB sync/atomic
15 kB hash
15 kB internal/bytealg
14 kB internal/testlog
12 kB runtime/internal/atomic
11 kB runtime/internal/sys
8.0 kB unicode/utf16
7.2 kB internal/syscall/unix
6.8 kB encoding
4.2 kB errors
3.6 kB internal/race
1.6 kB runtime/internal/math