out, _, err := unquote(s, false)
	return out, err
}

// Unquote interprets s as a single-quoted, double-quoted,
// or backquoted Go string literal, returning the string value
// that s quotes.  (If s is single-quoted, it would be a Go
// character literal; Unquote returns the corresponding
// one-character string.)
func Unquote(s string) (string, error) {
	out, rem, err := unquote(s, true)
	if len(rem) > 0 {

		if strings.Contains(flag, "$") {
			f := `"` + field[1] + `"`
			if field[1], err = strconv.Unquote(f); err != nil {
				t.Errorf("%s:%d: cannot unquote %s", file, lineno, f)
			}
			f = `"` + field[2] + `"`
			if field[2], err = strconv.Unquote(f); err != nil {
				t.Errorf("%s:%d: cannot unquote %s", file, lineno, f)
			}
		}

		//   Field 2: the regular expression pattern; SAME uses the pattern from

			c = c - 'A' + 10
		default:
			return -1
		}
		r = r*16 + rune(c)
	}
	return r
}

// unquote converts a quoted JSON string literal s into an actual string t.
// The rules are different than for Go, so cannot use strconv.Unquote.
func unquote(s []byte) (t string, ok bool) {
	s, ok = unquoteBytes(s)
	t = string(s)
	return
}

// unquoteBytes should be an internal detail,

			return nil, fmt.Errorf("expected []byte")
		}
		lit, ok := arg.(*ast.BasicLit)
		if !ok || lit.Kind != token.STRING {
			return nil, fmt.Errorf("string literal required for type []byte")
		}
		s, err := strconv.Unquote(lit.Value)
		if err != nil {
			return nil, err
		}
		return []byte(s), nil
	}

	var idType *ast.Ident
	if selector, ok := call.Fun.(*ast.SelectorExpr); ok {
		xIdent, ok := selector.X.(*ast.Ident)

					panic("unreachable")
				}
			}
			unquoted, err := strconv.Unquote(strings.TrimSpace(pattern))
			if err != nil {
				t.Errorf("%s:%d:%d: invalid ERROR pattern (cannot unquote %s)", filename, line, want.Pos.Col(), pattern)
				continue
			}
			if substr {
				if !strings.Contains(gotMsg, unquoted) {
					continue
				}
			} else {
				rx, err := regexp.Compile(unquoted)
				if err != nil {

// been scanned.
func (t *Tree) parseDefinition() {
	const context = "define clause"
	name := t.expectOneOf(itemString, itemRawString, context)
	var err error
	t.Name, err = strconv.Unquote(name.val)
	if err != nil {
		t.error(err)
	}
	t.expect(itemRightDelim, context)
	var end Node
	t.Root, end = t.itemList()
	if end.Type() != nodeEnd {
		t.errorf("unexpected %s in %s", end, context)
	}

		if !ok {
			continue
		}
		for _, dspec := range d.Specs {
			spec, ok := dspec.(*ast.ImportSpec)
			if !ok {
				continue
			}
			quoted := spec.Path.Value
			path, err := strconv.Unquote(quoted)
			if err != nil {
				return fmt.Errorf("parser returned invalid quoted string: <%s>", quoted)
			}
			if path == "embed" {
				hasEmbed = true
			}

			doc := spec.Doc

					panic("unreachable")
				}
			}
			unquoted, err := strconv.Unquote(strings.TrimSpace(pattern))
			if err != nil {
				t.Errorf("%s:%d:%d: invalid ERROR pattern (cannot unquote %s)", filename, line, want.col, pattern)
				continue
			}
			if substr {
				if !strings.Contains(gotMsg, unquoted) {
					continue
				}
			} else {
				rx, err := regexp.Compile(unquoted)
				if err != nil {

// #include processing.
func (in *Input) include() {
	// Find and parse string.
	tok := in.Stack.Next()
	if tok != scanner.String {
		in.expectText("expected string after #include")
	}
	name, err := strconv.Unquote(in.Stack.Text())
	if err != nil {
		in.Error("unquoting include file name: ", err)
	}
	in.expectNewline("#include")
	// Push tokenizer for file onto stack.
	fd, err := os.Open(name)
	if err != nil {

				switch c {
				case '\\':
					if i+1 == len(line) {
						g.errorf("bad backslash")
					}
					i++ // Absorb next byte (If it's a multibyte we'll get an error in Unquote).
				case '"':
					word, err := strconv.Unquote(line[0 : i+1])
					if err != nil {
						g.errorf("bad quoted string")
					}
					words = append(words, word)
					line = line[i+1:]