var x [1]struct{}
	_ = x[OpNoMatch-1]
	_ = x[OpEmptyMatch-2]
	_ = x[OpLiteral-3]
	_ = x[OpCharClass-4]
	_ = x[OpAnyCharNotNL-5]
	_ = x[OpAnyChar-6]
	_ = x[OpBeginLine-7]
	_ = x[OpEndLine-8]
	_ = x[OpBeginText-9]
	_ = x[OpEndText-10]
	_ = x[OpWordBoundary-11]
	_ = x[OpNoWordBoundary-12]
	_ = x[OpCapture-13]
	_ = x[OpStar-14]
	_ = x[OpPlus-15]
	_ = x[OpQuest-16]
	_ = x[OpRepeat-17]
	_ = x[OpConcat-18]

	OpAnyChar                      // matches any character
	OpBeginLine                    // matches empty string at beginning of line
	OpEndLine                      // matches empty string at end of line
	OpBeginText                    // matches empty string at beginning of text
	OpEndText                      // matches empty string at end of text
	OpWordBoundary                 // matches word boundary `\b`

		return c.rune(anyRuneNotNL, 0)
	case OpAnyChar:
		return c.rune(anyRune, 0)
	case OpBeginLine:
		return c.empty(EmptyBeginLine)
	case OpEndLine:
		return c.empty(EmptyEndLine)
	case OpBeginText:
		return c.empty(EmptyBeginText)
	case OpEndText:
		return c.empty(EmptyEndText)
	case OpWordBoundary:
		return c.empty(EmptyWordBoundary)
	case OpNoWordBoundary:
		return c.empty(EmptyNoWordBoundary)

	OpEmptyMatch:     "emp",
	OpLiteral:        "lit",
	OpCharClass:      "cc",
	OpAnyCharNotNL:   "dnl",
	OpAnyChar:        "dot",
	OpBeginLine:      "bol",
	OpEndLine:        "eol",
	OpBeginText:      "bot",
	OpEndText:        "eot",
	OpWordBoundary:   "wb",
	OpNoWordBoundary: "nwb",
	OpCapture:        "cap",
	OpStar:           "star",
	OpPlus:           "plus",
	OpQuest:          "que",

			p.parseVerticalBar()
			t = t[1:]
		case ')':
			if err = p.parseRightParen(); err != nil {
				return nil, err
			}
			t = t[1:]
		case '^':
			if p.flags&OneLine != 0 {
				p.op(OpBeginText)
			} else {
				p.op(OpBeginLine)
			}
			t = t[1:]
		case '$':
			if p.flags&OneLine != 0 {
				p.op(OpEndText).Flags |= WasDollar
			} else {
				p.op(OpEndLine)
			}
			t = t[1:]

		{"NonGreedy", Const, 0},
		{"OneLine", Const, 0},
		{"Op", Type, 0},
		{"OpAlternate", Const, 0},
		{"OpAnyChar", Const, 0},
		{"OpAnyCharNotNL", Const, 0},
		{"OpBeginLine", Const, 0},
		{"OpBeginText", Const, 0},
		{"OpCapture", Const, 0},
		{"OpCharClass", Const, 0},
		{"OpConcat", Const, 0},
		{"OpEmptyMatch", Const, 0},
		{"OpEndLine", Const, 0},
		{"OpEndText", Const, 0},

pkg regexp/syntax, const OpAlternate Op
pkg regexp/syntax, const OpAnyChar Op
pkg regexp/syntax, const OpAnyCharNotNL Op
pkg regexp/syntax, const OpBeginLine Op
pkg regexp/syntax, const OpBeginText Op
pkg regexp/syntax, const OpCapture Op
pkg regexp/syntax, const OpCharClass Op
pkg regexp/syntax, const OpConcat Op
pkg regexp/syntax, const OpEmptyMatch Op
pkg regexp/syntax, const OpEndLine Op

pkg regexp/syntax, const OpAlternate = 19
pkg regexp/syntax, const OpAnyChar = 6
pkg regexp/syntax, const OpAnyCharNotNL = 5
pkg regexp/syntax, const OpBeginLine = 7
pkg regexp/syntax, const OpBeginText = 9
pkg regexp/syntax, const OpCapture = 13
pkg regexp/syntax, const OpCharClass = 4
pkg regexp/syntax, const OpConcat = 18
pkg regexp/syntax, const OpEmptyMatch = 2
pkg regexp/syntax, const OpEndLine = 8