For now, because you haven't published the module yet, you need to adapt the example.com/hello module so it can find the example.com/greetings code on your local file system.
现在来说，因为尚没发布模块(example.com/greeting)，你须要调整 example.com/hello模块，使得它(example.com/hello)可以在本地文件系统中找到 example.com/greetings 代码。
模块感知模式
模块感知模式
use the go mod edit command to edit the example.com/hello module to redirect Go tools from its module path (where the module isn't) to the local directory (where it is).
step #1:
go mod edit -replace */=/
step #2:
go mod tidy
go mod edit -replace example.com/greetings=../greetings
模块(module)路径修改 如何修改模块的路径，将线上的路径指向本地。