install ctags from https://github.com/universal-ctags/ctags.git
usage: cargo ctags [cargo metadata arguments] -- [ctags arguments]
~/codes/cargo-ctags $ cargo install cargo-ctags
~/codes/cargo-ctags $ cargo ctags -- -e # TAGS for emacs
~/codes/cargo-ctags $ ls -l TAGS
-rw-rw-r-- 1 urugang urugang 1415698 2017-05-31 08:13 TAGSc
~/codes/cargo-ctags $ cargo ctags -- # TAGS for vi
~/codes/cargo-ctags $ ls -l tags
-rw-rw-r-- 1 urugang urugang 1415698 2017-05-31 08:14 tagsc
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