# Test GOEXPERIMENT variable

# go env shows default empty GOEXPERIMENT
go env
stdout GOEXPERIMENT=

# go env shows valid experiments
env GOEXPERIMENT=fieldtrack,staticlockranking
go env GOEXPERIMENT
stdout '.*fieldtrack.*staticlockranking.*'
go env
stdout 'GOEXPERIMENT=.*fieldtrack.*staticlockranking.*'

# go env rejects unknown experiments
env GOEXPERIMENT=bad
! go env GOEXPERIMENT

package buildcfg

import (
	"fmt"
	"reflect"
	"strings"

	"internal/goexperiment"
)

// ExperimentFlags represents a set of GOEXPERIMENT flags relative to a baseline
// (platform-default) experiment configuration.
type ExperimentFlags struct {
	goexperiment.Flags
	baseline goexperiment.Flags
}

// Experiment contains the toolchain experiments enabled for the
// current build.
//

// Package goexperiment implements support for toolchain experiments.
//
// Toolchain experiments are controlled by the GOEXPERIMENT
// environment variable. GOEXPERIMENT is a comma-separated list of
// experiment names. GOEXPERIMENT can be set at make.bash time, which
// sets the default experiments for binaries built with the tool
// chain; or it can be set at build time. GOEXPERIMENT can also be set

[short] skip
# Reset all experiments so fieldtrack is definitely off.
env GOEXPERIMENT=none
go run m
stderr 'fieldtrack off'
# Turn fieldtrack on.
env GOEXPERIMENT=none,fieldtrack
go run m
stderr 'fieldtrack on'

-- ft_off.go --
// +build !goexperiment.fieldtrack

package main

func main() {
	println("fieldtrack off")
}

-- ft_on.go --
// +build goexperiment.fieldtrack

package main

func main() {

# Test that we can unset variables, even if initially invalid,
# as long as resulting config is valid.

env GOENV=badenv
env GOOS=
env GOARCH=
env GOEXPERIMENT=

! go env
stderr '^go(\.exe)?: unknown GOEXPERIMENT badexp$'

go env -u GOEXPERIMENT

! go env
stderr '^go: unsupported GOOS/GOARCH pair bados/badarch$'

! go env -u GOOS
stderr '^go: unsupported GOOS/GOARCH pair \w+/badarch$'

! go env -u GOARCH

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

//go:build (goexperiment.boringcrypto && !boringcrypto) || (!goexperiment.boringcrypto && boringcrypto)

package boring_test

import "testing"

func TestNotBoring(t *testing.T) {
	t.Error("goexperiment.boringcrypto and boringcrypto should be equivalent build tags")

// Code generated by mkconsts.go. DO NOT EDIT.

//go:build !goexperiment.arenas

package goexperiment

const Arenas = false

// Code generated by mkconsts.go. DO NOT EDIT.

//go:build goexperiment.boringcrypto

package goexperiment

const BoringCrypto = true

// Code generated by mkconsts.go. DO NOT EDIT.

//go:build goexperiment.cacheprog

package goexperiment

const CacheProg = true

// Code generated by mkconsts.go. DO NOT EDIT.

//go:build !goexperiment.coverageredesign

package goexperiment

const CoverageRedesign = false