const c3 = "foo"
	0 // ERROR "0 (untyped int constant) is not used"
	0.5 // ERROR "0.5 (untyped float constant) is not used"
	"foo" // ERROR `"foo" (untyped string constant) is not used`
	c1 // ERROR "c1 (untyped int constant 991) is not used"
	c2 // ERROR "c2 (constant 0.5 of type float32) is not used"
	c1 /* ERROR "c1 + c2 (constant 991.5 of type float32) is not used" */ + c2
	c3 // ERROR `c3 (untyped string constant "foo") is not used`

 *
 *  05-Sep-2004   Added internal test interface. (JDS)
 */

/** @file
 *  Error handling functions (user interface).
 *  CUnit uses a simple (and conventional) error handling strategy.
 *  Functions that can generate errors set (and usually return) an
 *  error code to indicate the run status.  The error code can be

	"fmt"
	"go/token"
	"io"
	"sort"
)

// In an [ErrorList], an error is represented by an *Error.
// The position Pos, if valid, points to the beginning of
// the offending token, and the error condition is described
// by Msg.
type Error struct {
	Pos token.Position
	Msg string
}

// Error implements the error interface.
func (e Error) Error() string {
	if e.Pos.Filename != "" || e.Pos.IsValid() {

package mvs

import (
	"fmt"
	"strings"

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

// BuildListError decorates an error that occurred gathering requirements
// while constructing a build list. BuildListError prints the chain
// of requirements to the module where the error occurred.
type BuildListError struct {
	Err   error
	stack []buildListErrorElem
}

type buildListErrorElem struct {
	m module.Version

	Line int
	Op   string
	Args []string
	Err  error
}

func cmdError(cmd *command, err error) *CommandError {
	return &CommandError{
		File: cmd.file,
		Line: cmd.line,
		Op:   cmd.name,
		Args: cmd.args,
		Err:  err,
	}
}

func (e *CommandError) Error() string {
	if len(e.Args) == 0 {
		return fmt.Sprintf("%s:%d: %s: %v", e.File, e.Line, e.Op, e.Err)
	}

import (
	"fmt"
)

// ErrUnknownRegion - unknown region error.
type ErrUnknownRegion struct {
	Region string
}

func (err ErrUnknownRegion) Error() string {
	return fmt.Sprintf("unknown region '%v'", err.Region)
}

// ErrARNNotFound - ARN not found error.
type ErrARNNotFound struct {
	ARN ARN
}

func (err ErrARNNotFound) Error() string {
	return fmt.Sprintf("ARN '%v' not found", err.ARN)
}

// license that can be found in the LICENSE file.

TEXT foo(SB), 0, $0
	RET
TEXT foo(SB), 0, $0 // ERROR "symbol foo redeclared"
	RET

GLOBL bar(SB), 0, $8
GLOBL bar(SB), 0, $8 // ERROR "symbol bar redeclared"

DATA bar+0(SB)/8, $0

					haveABI = abi
				}
			}
		}

		// Give a special error message for main symbol (see #24809).
		if name == "main.main" {
			reporter.Errorf(s, "function main is undeclared in the main package")
		} else if haveABI != ^obj.ABI(0) {
			reporter.Errorf(s, "relocation target %s not defined for %s (but is defined for %s)", name, reqABI, haveABI)
		} else {
			reporter.Errorf(s, "relocation target %s not defined", name)
		}
	}

	if err == nil {
		return nil
	}
	return &SyscallError{syscall, err}
}

// IsExist returns a boolean indicating whether the error is known to report
// that a file or directory already exists. It is satisfied by [ErrExist] as
// well as some syscall errors.
//
// This function predates [errors.Is]. It only supports errors returned by
// the os package. New code should use errors.Is(err, fs.ErrExist).

func Errorf(format string, a ...interface{}) error {
	e := fmt.Errorf(format, a...)
	ee := Error{}
	ee.msg = e.Error()
	ee.cause = errors.Unwrap(e)
	return ee
}

// Unwrap the internal error.
func (e Error) Unwrap() error { return e.cause }

// Error 'error' compatible method.
func (e Error) Error() string {
	if e.msg == "" {
		return "crypto: cause <nil>"
	}
	return e.msg
}

var (