func PrintMessage() {
	fmt.Println("hello")
}
-- m/overlay/printpath.go --
package main

import (
	"fmt"
	"path/filepath"
	"runtime"
)

func main() {
	_, file, _, _ := runtime.Caller(0)

	// Since https://golang.org/cl/214286, the runtime's debug paths are
	// slash-separated regardless of platform, so normalize them to system file
	// paths.
	fmt.Println(filepath.FromSlash(file))
}

pkg syscall (freebsd-riscv64), type RtMetrics struct #53466
pkg syscall (freebsd-riscv64), type RtMetrics struct, Expire uint64 #53466
pkg syscall (freebsd-riscv64), type RtMetrics struct, Filler [3]uint64 #53466
pkg syscall (freebsd-riscv64), type RtMetrics struct, Hopcount uint64 #53466
pkg syscall (freebsd-riscv64), type RtMetrics struct, Locks uint64 #53466

cp go.mod.orig go.mod
go get -u .
cmp go.mod go.mod.want


# 'go get' of a specific version should allow upgrades of
# every dependency (transitively) required by that version,
# including dependencies that are pulled into the module
# graph by upgrading other root requirements
# (in this case, example.net/indirect).

cp go.mod.orig go.mod
go get example.net/a@v0.2.0
cmp go.mod go.mod.want


-- go.mod --

pkg syscall (freebsd-arm64), type RtMetrics struct
pkg syscall (freebsd-arm64), type RtMetrics struct, Expire uint64
pkg syscall (freebsd-arm64), type RtMetrics struct, Filler [3]uint64
pkg syscall (freebsd-arm64), type RtMetrics struct, Hopcount uint64
pkg syscall (freebsd-arm64), type RtMetrics struct, Locks uint64
pkg syscall (freebsd-arm64), type RtMetrics struct, Mtu uint64

pkg syscall (darwin-arm64), type RtMetrics struct
pkg syscall (darwin-arm64), type RtMetrics struct, Expire int32
pkg syscall (darwin-arm64), type RtMetrics struct, Filler [4]uint32
pkg syscall (darwin-arm64), type RtMetrics struct, Hopcount uint32
pkg syscall (darwin-arm64), type RtMetrics struct, Locks uint32
pkg syscall (darwin-arm64), type RtMetrics struct, Mtu uint32