specifying a different source package

I haven't found a way to specify a different source package than the current one when invoking commands like mv A B. I'm working around this limitation by calling rf in a shell script that changes the working directory before invoking it. In a large codebase, each invocation of rf requires about 15-30 seconds to load everything before it does any refactoring. In my case, I wanted to rename structs in 130 packages and this took over an hour.

Example:

go.mod

module example.com/p

go 1.16

p.go

package p

var nothing string

a/a.go

package a

var A int

If I understand code addresses correctly, I would expect to be able to write something like this:

rf 'mv example.com/p/a:A A'

Start with the rf command syntax and the code-address behavior described in the issue, using the example go.mod, p.go, and a/a.go files as the reproduction. Determine how a command such as mv A B selects its source package and how the proposed example.com/p/a:A form should work. Done means a single invocation can refactor symbols in a different package without changing directories or repeatedly loading the codebase.