"TESTGO_GOHOSTARCH=" + goHostArch,
		"GOCACHE=" + testGOCACHE,
		"GOCOVERDIR=" + os.Getenv("GOCOVERDIR"),
		"GODEBUG=" + os.Getenv("GODEBUG"),
		"GOEXE=" + cfg.ExeSuffix,
		"GOEXPERIMENT=" + os.Getenv("GOEXPERIMENT"),
		"GOOS=" + runtime.GOOS,
		"TESTGO_GOHOSTOS=" + goHostOS,
		"GOPROXY=" + proxyURL,
		"GOPRIVATE=",
		"GOROOT=" + testGOROOT,
		"GOTRACEBACK=system",

		cmd = testenv.CleanCmdEnv(cmd)

		// Add the rangefunc GOEXPERIMENT unconditionally since some tests depend on it.
		// TODO(61405): Remove this once it's enabled by default.
		edited := false
		for i := range cmd.Env {
			e := cmd.Env[i]
			if _, vars, ok := strings.Cut(e, "GOEXPERIMENT="); ok {
				cmd.Env[i] = "GOEXPERIMENT=" + vars + ",rangefunc"
				edited = true
			}
		}
		if !edited {

	commands' outputs.



The available conditions are:
[GOARCH:*]
	runtime.GOARCH == <suffix>
[GODEBUG:*]
	GODEBUG contains <suffix>
[GOEXPERIMENT:*]
	GOEXPERIMENT <suffix> is enabled
[GOOS:*]
	runtime.GOOS == <suffix>
[abscc]
	default $CC path is absolute and exists
[asan]
	GOOS/GOARCH supports -asan
[buildmode:*]
	go supports -buildmode=<suffix>

	exepath3 string
	tool     string
	outdirs  [4]string
}

const debugWorkDir = false

func TestCovTool(t *testing.T) {
	testenv.MustHaveGoBuild(t)
	if !goexperiment.CoverageRedesign {
		t.Skipf("stubbed out due to goexperiment.CoverageRedesign=false")
	}
	dir := tempDir(t)
	if testing.Short() {
		t.Skip()
	}
	if debugWorkDir {
		// debugging
		dir = "/tmp/qqq"
		os.RemoveAll(dir)

//
// crosscall2 restores the callee-save registers for gcc and returns
// to GoF, which unpacks any result values and returns to f.

package runtime

import (
	"internal/abi"
	"internal/goarch"
	"internal/goexperiment"
	"runtime/internal/sys"
	"unsafe"
)

// Addresses collected in a cgo backtrace when crashing.
// Length must match arg.Max in x_cgo_callers in runtime/cgo/gcc_traceback.c.
type cgoCallers [32]uintptr

	"go/constant",
	"go/version",
	"internal/abi",
	"internal/coverage",
	"cmd/internal/cov/covcmd",
	"internal/bisect",
	"internal/buildcfg",
	"internal/goarch",
	"internal/godebugs",
	"internal/goexperiment",
	"internal/goroot",
	"internal/gover",
	"internal/goversion",
	// internal/lazyregexp is provided by Go 1.17, which permits it to
	// be imported by other packages in this list, but is not provided

// 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.

//go:build goexperiment.staticlockranking

package runtime

import (
	"internal/runtime/atomic"
	"unsafe"
)

const staticLockRanking = true

// worldIsStopped is accessed atomically to track world-stops. 1 == world
// stopped.
var worldIsStopped atomic.Uint32

		// get per-file instructions
		expectErrors := false
		filename := filepath.Join(path, f.Name())
		goVersion := ""
		if comment := firstComment(filename); comment != "" {
			if strings.Contains(comment, "-goexperiment") {
				continue // ignore this file
			}
			fields := strings.Fields(comment)
			switch fields[0] {
			case "skip", "compiledir":
				continue // ignore this file
			case "errorcheck":

		generated by running a "go build -cover" binary.
		Requires that GOEXPERIMENT=coverageredesign is enabled.

Special-purpose environment variables:

	GCCGOTOOLDIR
		If set, where to find gccgo tools, such as cgo.
		The default is based on how gccgo was configured.
	GOEXPERIMENT
		Comma-separated list of toolchain experiments to enable or disable.

		cmd := testenv.Command(t, testenv.GoToolPath(t), "run")
		if race.Enabled {
			cmd.Args = append(cmd.Args, "-race")
		}
		cmd.Args = append(cmd.Args, testPath)
		cmd.Env = append(os.Environ(), "GOEXPERIMENT=rangefunc")
		// Add a stack ownership check. This is cheap enough for testing.
		godebug := "tracecheckstackownership=1"
		if stress {
			// Advance a generation constantly to stress the tracer.