if strings.Msg != "hello, world" {
		t.Fatalf("unexpected msg: %v", strings.Msg)
	}
}
-- vend/hello/hellox_test.go --
package main_test

import (
	"strings" // really ../vendor/strings
	"testing"
)

func TestMsgExternal(t *testing.T) {
	if strings.Msg != "hello, world" {
		t.Fatalf("unexpected msg: %v", strings.Msg)
	}
}
-- vend/vendor/strings/msg.go --
package strings

					if e, ok := v.Exprs[0].(Expr); ok {
						sql := strings.ToUpper(e.SQL)
						wrapInParentheses = strings.Contains(sql, AndWithSpace) || strings.Contains(sql, OrWithSpace)
					}
				}
			case AndConditions:
				if len(v.Exprs) == 1 {
					if e, ok := v.Exprs[0].(Expr); ok {
						sql := strings.ToUpper(e.SQL)
						wrapInParentheses = strings.Contains(sql, AndWithSpace) || strings.Contains(sql, OrWithSpace)
					}
				}
			case Expr:

			want: strings.Repeat("a", 74) + "=\r\n=3D",
		},
		{
			in:   strings.Repeat("a", 75) + "=",
			want: strings.Repeat("a", 75) + "=\r\n=3D",
		},
		{
			in:   strings.Repeat(" ", 73),
			want: strings.Repeat(" ", 72) + "=20",
		},
		{
			in:   strings.Repeat(" ", 74),
			want: strings.Repeat(" ", 73) + "=\r\n=20",
		},
		{
			in:   strings.Repeat(" ", 75),
			want: strings.Repeat(" ", 74) + "=\r\n=20",

# go test
go test -C ../strings -n
stderr 'strings\.test'

# go vet
go vet -C ../strings -n
stderr strings_test

# -C must be first on command line (as of Go 1.21)
! go test -n -C ../strings
stderr '^invalid value "../strings" for flag -C: -C flag must be first flag on command line$'

-- custom/go.mod --

			// incorrectly flag "comments" inside multiline
			// string constants or anything else (this might
			// not even be a Go program). So stop.
			break
		}
	}
}

func (check *checker) comment(pos token.Pos, text string) {
	if strings.HasPrefix(text, "//") {
		if strings.Contains(text, "+build") {
			check.plusBuildLine(pos, text)
		}
		if strings.Contains(text, "//go:build") {
			check.goBuildLine(pos, text)

package main

import (
	"fmt"
	"os"
	"os/exec"
	"path/filepath"
	"strings"
)

func changeVolume(s string, f func(s string) string) string {
	vol := filepath.VolumeName(s)
	return f(vol) + s[len(vol):]
}

func main() {
	gopath := changeVolume(os.Args[1], strings.ToLower)
	dir := changeVolume(os.Args[2], strings.ToUpper)
	cmd := exec.Command("go", "run", "hello.go")
	cmd.Dir = dir

func parseCredentialHeader(credElement string, region string, stype serviceType) (ch credentialHeader, aec APIErrorCode) {
	creds := strings.SplitN(strings.TrimSpace(credElement), "=", 2)
	if len(creds) != 2 {
		return ch, ErrMissingFields
	}
	if creds[0] != "Credential" {
		return ch, ErrMissingCredTag
	}
	credElements := strings.Split(strings.TrimSpace(creds[1]), SlashSeparator)

		kind = "//"
		var b strings.Builder
		for _, c := range list {
			after, found := strings.CutPrefix(c.Text, "//")
			if !found {
				return list
			}
			// Accumulate //go:build etc lines separately.
			if isDirective(after) {
				directives = append(directives, c)
				continue
			}
			b.WriteString(strings.TrimPrefix(after, " "))
			b.WriteString("\n")
		}
		text = b.String()

		if 'A' <= r && r <= 'Z' {
			r += 'a' - 'A'
		}
		b.WriteRune(r)
	}
	return b.String()
}

// FoldDup reports a pair of strings from the list that are
// equal according to strings.EqualFold.
// It returns "", "" if there are no such strings.
func FoldDup(list []string) (string, string) {
	clash := map[string]string{}
	for _, s := range list {
		fold := ToFold(s)
		if t := clash[fold]; t != "" {
			if s > t {

	if !strings.Contains(s, "a.go:15") {
		panic("missing a.go:15")
	}
	if !strings.Contains(s, "a.go:19") {
		panic("missing a.go:19")
	}
	if !strings.Contains(s, "a.init") {
		panic("missing a.init")
	}

	// Check the CallersFrames results.
	if debug {
		iter := runtime.CallersFrames(pcs[:n])
		for {
			f, more := iter.Next()
			fmt.Printf("%s %s:%d\n", f.Function, f.File, f.Line)
			if !more {
				break
			}
		}