go get
code:go-help-get-go.1.16.txt
go help get
Get resolves its command-line arguments to packages at specific module versions,
updates go.mod to require those versions, downloads source code into the
module cache, then builds and installs the named packages.
code:go-help-get-go.1.15.txt
go help get
Get resolves and adds dependencies to the current development module
and then builds and installs them.