cmd/go: import paths can contain the .test suffix, breaking the toolchain #60454
Description
What version of Go are you using (go version)?
$ go version go version devel go1.21-231f290e51 Sat Apr 8 05:25:04 2023 +0000 linux/amd64
Does this issue reproduce with the latest release?
Yes
What did you do?
Given
-- foo/foo.go --
package foo
import _ "example.com/foo.test"
-- foo/foo_test.go --
package foo
-- foo.test/bar.go --
package bar
-- go.mod --
module example.com
go 1.21
run go test ./foo
What did you expect to see?
One of
- no error
- an explanation for the error
- an explicit error forbidding using
foo.testas an import path
What did you see instead?
/home/dominikh/prj/go/pkg/tool/linux_amd64/link: fingerprint mismatch: example.com/foo.test has 36b962da8ceb542c, import from example.com/foo expecting aa419b4c2ff8e5ed