# Test that experiments appear in "go version <binary>"

# This test requires rebuilding the runtime, which takes a while.
[short] skip

env GOEXPERIMENT=fieldtrack
go build -o main$GOEXE version.go
go version main$GOEXE
stdout 'X:fieldtrack$'
exec ./main$GOEXE
stderr 'X:fieldtrack$'

-- version.go --
package main
import "runtime"

! go env -w GOMODCACHE=./test
stderr 'go: GOMODCACHE entry is relative; must be absolute path: "./test"'

# go env -w checks validity of GOEXPERIMENT
env GOEXPERIMENT=
! go env -w GOEXPERIMENT=badexp
stderr 'unknown GOEXPERIMENT badexp'
go env -w GOEXPERIMENT=fieldtrack

# go env -w and go env -u work on unknown fields already in the go/env file
cp bad.env $GOENV
go env GOENV
cat $GOENV
go env

# The full test of toolchain version selection is in gotoolchain.txt.

# This test is sensitive to "new" Go experiments, so
# update the environment to remove any existing GOEXPERIMENT
# setting, see #62016 for more on this. 
env GOEXPERIMENT=''

env TESTGO_VERSION=go1.21actual

# GOTOOLCHAIN from network, does not exist
env GOTOOLCHAIN=go1.9999x
! go version
stderr 'go: download go1.9999x for .*: toolchain not available'

# Tests golang.org/issue/48490
# cmd/go should enable concurrent compilation by default

# Reset all experiments, since one of them can disable
# concurrent compilation, e.g: fieldtrack.
env GOEXPERIMENT=none

env GOMAXPROCS=4
go build -n -x -a fmt

// Copyright 2022 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.

//go:build boringcrypto

// This package only exists with GOEXPERIMENT=boringcrypto.
// It provides the actual syso file.

// compile -goexperiment fieldtrack

// Copyright 2020 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 p

func a(x struct{ f int }) { _ = x.f }

// runindir -goexperiment fieldtrack -ldflags -k=main.fieldTrackInfo

// Copyright 2021 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.

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package cfile

import (
	"encoding/json"
	"flag"
	"internal/coverage"
	"internal/goexperiment"
	"internal/testenv"
	"os"
	"os/exec"
	"path/filepath"
	"strings"
	"testing"
	_ "unsafe"
)

func testGoCoverDir(t *testing.T) string {
	if f := flag.Lookup("test.gocoverdir"); f != nil {

// errorcheckdir -0 -m

//go:build !goexperiment.newinliner

// Copyright 2017 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.

// errorcheckdir -0 -m

//go:build !goexperiment.newinliner

// Copyright 2020 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.