}
	goSum.m[mod] = append(goSum.m[mod], h)
}

// checkSumDB checks the mod, h pair against the Go checksum database.
// It calls base.Fatalf if the hash is to be rejected.
func checkSumDB(mod module.Version, h string) error {
	modWithoutSuffix := mod
	noun := "module"
	if before, found := strings.CutSuffix(mod.Version, "/go.mod"); found {

			matchPackages(ctx, m, imports.AnyTags(), omitStd, []module.Version{mod})
			return m
		}
	} else {
		match = func(mod module.Version, roots []string, isLocal bool) *search.Match {
			m := search.NewMatch(pattern)
			prefix := mod.Path
			if MainModules.Contains(mod.Path) {
				prefix = MainModules.PathPrefix(module.Version{Path: mod.Path})
			}
			for _, root := range roots {

//
// Given c, compute m such that (c * m) mod 2^n == 1
// Then if c divides x (x%c ==0), the quotient is given by q = x/c == x*m mod 2^n
//
// x can range from 0, c, 2c, 3c, ... ⎣(2^n - 1)/c⎦ * c the maximum multiple
// Thus, x*m mod 2^n is 0, 1, 2, 3, ... ⎣(2^n - 1)/c⎦
// i.e. the quotient takes all values from zero up to max = ⎣(2^n - 1)/c⎦
//
// If x is not divisible by c, then x*m mod 2^n must take some larger value than max.
//

useful on systems that do not preserve the module cache.

The -x flag causes download to print the commands download executes.

See https://golang.org/ref/mod#go-mod-download for more about 'go mod download'.

See https://golang.org/ref/mod#version-queries for more about version queries.
	`,
}

var (
	downloadJSON  = cmdDownload.Flag.Bool("json", false, "")
	downloadReuse = cmdDownload.Flag.String("reuse", "", "")
)

path instead of "vendor". The go command can only use a vendor directory
named "vendor" within the module root directory, so this flag is
primarily useful for other tools.

See https://golang.org/ref/mod#go-mod-vendor for more about 'go mod vendor'.
	`,
	Run: runVendor,
}

var vendorE bool   // if true, report errors but proceed anyway
var vendorO string // if set, overrides the default output directory

func init() {

	"GCCGOTOOLDIR",       // for gccgo testing
}

// updateSum runs 'go mod tidy', 'go list -mod=mod -m all', or
// 'go list -mod=mod all' in the test's current directory if a file named
// "go.mod" is present after the archive has been extracted. updateSum modifies
// archive and returns true if go.mod or go.sum were changed.

		// command line. Recommend 'go mod download' for the modules that could
		// provide the package, since that shouldn't change go.mod.
		if len(e.mods) > 0 {
			args := make([]string, len(e.mods))
			for i, mod := range e.mods {
				args[i] = mod.Path
			}
			hint = fmt.Sprintf("; to add:\n\tgo mod download %s", strings.Join(args, " "))
		}
	} else {

package workcmd

import (
	"cmd/go/internal/base"
	"cmd/go/internal/gover"
	"cmd/go/internal/modload"
	"context"
	"encoding/json"
	"fmt"
	"os"
	"path/filepath"
	"strings"

	"golang.org/x/mod/module"

	"golang.org/x/mod/modfile"
)

var cmdEdit = &base.Command{
	UsageLine: "go work edit [editing flags] [go.work]",
	Short:     "edit go.work from tools or scripts",

		if err != nil {
			// If we can't load the requirements, we couldn't load the go.mod file.
			// There are a number of reasons this can happen, but this usually
			// means an older version of the module had a missing or invalid
			// go.mod file. For example, if example.com/mod released v2.0.0 before
			// migrating to modules (v2.0.0+incompatible), then added a valid go.mod
			// in v2.0.1, downgrading from v2.0.1 would cause this error.
			//

	const pkg = "example.com/pgo/inline"

	// Add a go.mod so we have a consistent symbol names in this temp dir.
	goMod := fmt.Sprintf(`module %s
go 1.19
`, pkg)
	if err := os.WriteFile(filepath.Join(dir, "go.mod"), []byte(goMod), 0644); err != nil {
		t.Fatalf("error writing go.mod: %v", err)
	}

	exe := filepath.Join(dir, "test.exe")