tg.grepStdout("-ffaster", "CC arguments not found")

	tg.run("env", "GOVERSION")
	envVersion := strings.TrimSpace(tg.stdout.String())

	tg.run("version")
	cmdVersion := strings.TrimSpace(tg.stdout.String())

	// If 'go version' is "go version <version> <goos>/<goarch>", then
	// 'go env GOVERSION' is just "<version>".
	if cmdVersion == envVersion || !strings.Contains(cmdVersion, envVersion) {

package build

import (
	"bytes"
	"errors"
	"fmt"
	"go/ast"
	"go/build/constraint"
	"go/doc"
	"go/token"
	"internal/buildcfg"
	"internal/godebug"
	"internal/goroot"
	"internal/goversion"
	"internal/platform"
	"io"
	"io/fs"
	"os"
	"os/exec"
	pathpkg "path"
	"path/filepath"
	"runtime"
	"slices"
	"strconv"
	"strings"
	"unicode"
	"unicode/utf8"
	_ "unsafe" // for linkname

	r.reportChanges(oldReqs, newReqs)

	if gowork := modload.FindGoWork(base.Cwd()); gowork != "" {
		wf, err := modload.ReadWorkFile(gowork)
		if err == nil && modload.UpdateWorkGoVersion(wf, modload.MainModules.GoVersion()) {
			modload.WriteWorkFile(gowork, wf)
		}
	}
}

// parseArgs parses command-line arguments and reports errors.
//
// The command-line arguments are of the form path@version or simply path, with