How to separate code in different directory by 'go mod'?

Question

My source directory layout like

mywork/libA
mywork/libA/liba.go
mywork/libA/go.mod
mywork/progB
mywork/progB/go.mod
mywork/progB/progb.go

libA/liba.go

package liba
func Hi() string {      return "hi" }

libA/go.mod

module example.com/mywork/liba

go 1.13

progB/progb.go

package main
import "example.com/mywork/liba"
func main() { println("progb:", liba.Hi()) }

progB/go.mod

module example.com/mywork/progb

go 1.13

The go build in libA directory is workable. But the go build failed in progB and shows

build example.com/mywork/progb: cannot load example.com/mywork/liba: cannot find module providing package example.com/mywork/liba

How to correct it?

https://github.com/golang/go/wiki/Modules#can-i-work-entirely-outside-of-vcs-on-my-local-filesystem — Charlie Tumahai, Feb 22 '20 at 01:15
Possible duplicate of [How to use a module that is outside of “GOPATH” in another module?](https://stackoverflow.com/questions/52328952/how-to-use-a-module-that-is-outside-of-gopath-in-another-module) — Charlie Tumahai, Feb 22 '20 at 01:39
I agree it is similar question, but I can not searched the answer from error message — Daniel YC Lin, Feb 22 '20 at 02:27

score 1 · Answer 1 · answered Feb 22 '20 at 01:34

module example.com/mywork/progb

require example.com/mywork/liba v0.0.0

replace example.com/mywork/liba => ../libA

go 1.13

1 Answers1