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An engineer needs a new Discount function in the pricing module and a call to it in the orders module, and both modules are in one parent directory on the same machine. To test them together before publishing pricing, the engineer adds a replace line to orders/go.mod. Everything works, the change is committed, and the next build on the build server fails.

main.go:7:2: example.com/pricing@v1.0.0: replacement directory ../pricing does not exist
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The replace line is correct only on a machine that has that directory, and the commit sent it to every machine