stderr '^go: rsc.io/fortune/nonexist@v0: module rsc.io/fortune@v0 found \(v0.0.1\), but does not contain package rsc.io/fortune/nonexist'

# go install m@v should use local toolchain if not upgrading
! go install rsc.io/fortune/nonexist@v1
! stderr go1.22.9
! stderr switching
stderr '^go: downloading rsc.io/fortune v1.0.0$'
stderr '^go: rsc.io/fortune/nonexist@v1: module rsc.io/fortune@v1 found \(v1.0.0\), but does not contain package rsc.io/fortune/nonexist'

[short] skip

# Check that 'go version' and 'go version -m' work on a binary built in module mode.
go get rsc.io/fortune
go build -o fortune.exe rsc.io/fortune
go version fortune.exe
stdout '^fortune.exe: .+'
go version -m fortune.exe
stdout -buildmode=exe
stdout '^\tpath\trsc.io/fortune'
stdout '^\tmod\trsc.io/fortune\tv1.0.0'

# Check the build info of a binary built from $GOROOT/src/cmd
go build -o test2json.exe cmd/test2json

go mod edit -require=rsc.io/fortune@v1.0.0
! go install -mod=readonly $GOPATH/pkg/mod/rsc.io/fortune@v1.0.0
stderr '^missing go\.sum entry for module providing package rsc\.io/fortune; to add:\n\tgo mod download rsc\.io/fortune$'
! go install -mod=readonly ../../pkg/mod/rsc.io/fortune@v1.0.0
stderr '^missing go\.sum entry for module providing package rsc\.io/fortune; to add:\n\tgo mod download rsc\.io/fortune$'
go get rsc.io/fortune@v1.0.0

[!cgo] skip '-buildmode=c-shared requires external linking'
[!buildmode:c-shared] stop

env GO111MODULE=on

go get rsc.io/fortune
go build -buildmode=c-shared -o external.so rsc.io/fortune
go version external.so
stdout '^external.so: .+'
go version -m external.so
stdout '^\tpath\trsc.io/fortune'
stdout '^\tmod\trsc.io/fortune\tv1.0.0'

-- go.mod --
module m

-- empty.go --
package main

	"strings"
	"testing"
)

func TestMapFS(t *testing.T) {
	m := MapFS{
		"hello":             {Data: []byte("hello, world\n")},
		"fortune/k/ken.txt": {Data: []byte("If a program is too slow, it must have a loop.\n")},
	}
	if err := TestFS(m, "hello", "fortune", "fortune/k", "fortune/k/ken.txt"); err != nil {
		t.Fatal(err)
	}
}

func TestMapFSChmodDot(t *testing.T) {
	m := MapFS{
		"a/b.txt": &MapFile{Mode: 0666},

go mod init tmp
go mod edit -require=rsc.io/fortune@v1.0.0
! go run -mod=readonly $GOPATH/pkg/mod/rsc.io/fortune@v1.0.0
stderr '^missing go\.sum entry for module providing package rsc\.io/fortune; to add:\n\tgo mod download rsc\.io/fortune$'
! go run -mod=readonly ../../pkg/mod/rsc.io/fortune@v1.0.0
stderr '^missing go\.sum entry for module providing package rsc\.io/fortune; to add:\n\tgo mod download rsc\.io/fortune$'
cd ..
rm tmp

# A binary from an external module built with -trimpath should not contain
# the current workspace or GOROOT.
go get rsc.io/fortune
go install -trimpath rsc.io/fortune
exec $WORK/paths-a.exe $GOPATH/bin/fortune$GOEXE
stdout 'binary contains module root: false'
stdout 'binary contains an empty GOROOT'
go mod edit -droprequire rsc.io/fortune

# Two binaries built from identical packages in different directories
# should be identical.
cd $WORK/b/src/paths

stderr 'running go1.50.0 from PATH'

# NewerToolchain should find Go 1.50.0.
env GOTOOLCHAIN=local
go mod edit -toolchain=none -go=1.22
grep 'go 1.22$' go.mod
! grep toolchain go.mod
env GOTOOLCHAIN=path
! go run rsc.io/fortune@v0.0.1
stderr 'running go1.50.0 from PATH'

-- fakego.go --
package main

import (
	"fmt"
	"os"
	"path/filepath"
	"strings"
)

func main() {
	exe, _ := os.Executable()

  public void forTree_breadthFirstIterable_twoTrees() {
    assertEqualCharNodes(Traverser.forTree(TWO_TREES).breadthFirst(charactersOf("a")), "ab");
    assertEqualCharNodes(Traverser.forTree(TWO_TREES).breadthFirst(charactersOf("ca")), "cadb");
  }

  @Test
  public void forTree_breadthFirst_singleRoot() {
    Iterable<Character> result = Traverser.forTree(SINGLE_ROOT).breadthFirst('a');

    assertEqualCharNodes(result, "a");
  }

  public void forTree_breadthFirstIterable_twoTrees() {
    assertEqualCharNodes(Traverser.forTree(TWO_TREES).breadthFirst(charactersOf("a")), "ab");
    assertEqualCharNodes(Traverser.forTree(TWO_TREES).breadthFirst(charactersOf("ca")), "cadb");
  }

  @Test
  public void forTree_breadthFirst_singleRoot() {
    Iterable<Character> result = Traverser.forTree(SINGLE_ROOT).breadthFirst('a');

    assertEqualCharNodes(result, "a");
  }