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env GO111MODULE=on
[short] skip
cp go.mod go.mod.orig
# Make sure the test builds without replacement.
go build -o a1.exe .
exec ./a1.exe
stdout 'Don''t communicate by sharing memory'
# Modules can be replaced by local packages.
cp go.mod.orig go.mod
go mod edit -replace=rsc.io/quote/v3=./local/rsc.io/quote/v3
go build -o a2.exe .
exec ./a2.exe
stdout 'Concurrency is not parallelism.'
# The module path of the replacement doesn't need to match.
# (For example, it could be a long-running fork with its own import path.)
cp go.mod.orig go.mod
go mod edit -replace=rsc.io/quote/v3=./local/not-rsc.io/quote/v3
go build -o a3.exe .
exec ./a3.exe
stdout 'Clear is better than clever.'
# However, the same module can't be used as two different paths.
cp go.mod.orig go.mod
go mod edit -replace=not-rsc.io/quote/v3@v3.0.0=rsc.io/quote/v3@v3.0.0 -require=not-rsc.io/quote/v3@v3.0.0
! go build -o a4.exe .
stderr 'rsc.io/quote/v3@v3.0.0 used for two different module paths \(not-rsc.io/quote/v3 and rsc.io/quote/v3\)'
# Modules that do not (yet) exist upstream can be replaced too.
cp go.mod.orig go.mod
go mod edit -replace=not-rsc.io/quote/v3@v3.1.0=./local/rsc.io/quote/v3
go build -o a5.exe ./usenewmodule
! stderr 'finding not-rsc.io/quote/v3'
grep 'not-rsc.io/quote/v3 v3.1.0' go.mod
exec ./a5.exe
stdout 'Concurrency is not parallelism.'
-- go.mod --
module quoter
require rsc.io/quote/v3 v3.0.0
-- main.go --
package main
import (
"fmt"
"rsc.io/quote/v3"
)
func main() {
fmt.Println(quote.GoV3())
}
-- usenewmodule/main.go --
package main
import (
"fmt"
"not-rsc.io/quote/v3"
)
func main() {
fmt.Println(quote.GoV3())
}
-- local/rsc.io/quote/v3/go.mod --
module rsc.io/quote/v3
require rsc.io/sampler v1.3.0
-- local/rsc.io/quote/v3/quote.go --
// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package quote collects pithy sayings.
package quote
import "rsc.io/sampler"
// Hello returns a greeting.
func HelloV3() string {
return sampler.Hello()
}
// Glass returns a useful phrase for world travelers.
func GlassV3() string {
// See http://www.oocities.org/nodotus/hbglass.html.
return "I can eat glass and it doesn't hurt me."
}
// Go returns a REPLACED Go proverb.
func GoV3() string {
return "Concurrency is not parallelism."
}
// Opt returns a optimization truth.
func OptV3() string {
// Wisdom from ken.
return "If a program is too slow, it must have a loop."
}
-- local/not-rsc.io/quote/v3/go.mod --
module not-rsc.io/quote/v3
-- local/not-rsc.io/quote/v3/quote.go --
package quote
func GoV3() string {
return "Clear is better than clever."
}
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