_ = x[_Arrow-9]
	_ = x[_Star-10]
	_ = x[_Lparen-11]
	_ = x[_Lbrack-12]
	_ = x[_Lbrace-13]
	_ = x[_Rparen-14]
	_ = x[_Rbrack-15]
	_ = x[_Rbrace-16]
	_ = x[_Comma-17]
	_ = x[_Semi-18]
	_ = x[_Colon-19]
	_ = x[_Dot-20]
	_ = x[_DotDotDot-21]
	_ = x[_Break-22]
	_ = x[_Case-23]
	_ = x[_Chan-24]
	_ = x[_Const-25]
	_ = x[_Continue-26]
	_ = x[_Default-27]
	_ = x[_Defer-28]
	_ = x[_Else-29]

			}

			// x[i:...
			// For better error message, don't simply use p.want(_Colon) here (go.dev/issue/47704).
			if !p.got(_Colon) {
				p.syntaxError("expected comma, : or ]")
				p.advance(_Comma, _Colon, _Rbrack)
			}
			p.xnest++
			t := new(SliceExpr)
			t.pos = pos
			t.X = x
			t.Index[0] = i
			if p.tok != _Colon && p.tok != _Rbrack {
				// x[i:j...
				t.Index[1] = p.expr()
			}

	_Arrow    // <-
	_Star     // *

	// delimiters
	_Lparen    // (
	_Lbrack    // [
	_Lbrace    // {
	_Rparen    // )
	_Rbrack    // ]
	_Rbrace    // }
	_Comma     // ,
	_Semi      // ;
	_Colon     // :
	_Dot       // .
	_DotDotDot // ...

	// keywords
	_Break       // break
	_Case        // case
	_Chan        // chan
	_Const       // const
	_Continue    // continue
	_Default     // default

	case *SliceExpr:
		p.print(n.X, _Lbrack)
		if i := n.Index[0]; i != nil {
			p.printNode(i)
		}
		p.print(_Colon)
		if j := n.Index[1]; j != nil {
			p.printNode(j)
		}
		if k := n.Index[2]; k != nil {
			p.print(_Colon, k)
		}
		p.print(_Rbrack)

	case *AssertExpr:
		p.print(n.X, _Dot, _Lparen, n.Type, _Rparen)

	case *TypeSwitchGuard:
		if n.Lhs != nil {

	case '}':
		s.nextch()
		s.nlsemi = true
		s.tok = _Rbrace

	case ':':
		s.nextch()
		if s.ch == '=' {
			s.nextch()
			s.tok = _Define
			break
		}
		s.tok = _Colon

	case '.':
		s.nextch()
		if isDecimal(s.ch) {
			s.number(true)
			break
		}
		if s.ch == '.' {
			s.nextch()
			if s.ch == '.' {
				s.nextch()
				s.tok = _DotDotDot
				break

	// delimiters
	{_Lparen, "(", 0, 0},
	{_Lbrack, "[", 0, 0},
	{_Lbrace, "{", 0, 0},
	{_Rparen, ")", 0, 0},
	{_Rbrack, "]", 0, 0},
	{_Rbrace, "}", 0, 0},
	{_Comma, ",", 0, 0},
	{_Semi, ";", 0, 0},
	{_Colon, ":", 0, 0},
	{_Dot, ".", 0, 0},
	{_DotDotDot, "...", 0, 0},

	// keywords
	{_Break, "break", 0, 0},
	{_Case, "case", 0, 0},
	{_Chan, "chan", 0, 0},
	{_Const, "const", 0, 0},

+ The PR title is formatted as follows: `net/http: frob the quux before blarfing`
  + The package name goes before the colon
  + The part after the colon uses the verb tense + phrase that completes the blank in,
    "This change modifies Go to ___________"
  + Lowercase verb after the colon
  + No trailing period
  + Keep the title as short as possible. ideally under 76 characters or shorter
+ No Markdown

		return true
	}

	// "//[a-z0-9]+:[a-z0-9]"
	// (The // has been removed.)
	colon := strings.Index(c, ":")
	if colon <= 0 || colon+1 >= len(c) {
		return false
	}
	for i := 0; i <= colon+1; i++ {
		if i == colon {
			continue
		}
		b := c[i]
		if !('a' <= b && b <= 'z' || '0' <= b && b <= '9') {
			return false
		}
	}
	return true
}

		line = trimSpace(removeComment(line))
		if len(line) == 0 {
			continue
		}
		colon := bytealg.IndexByteString(line, ':')
		if colon == -1 {
			conf.err = errors.New("no colon on line")
			return conf
		}
		db := trimSpace(line[:colon])
		srcs := line[colon+1:]
		for {
			srcs = trimSpace(srcs)
			if len(srcs) == 0 {
				break
			}

    }

    val singleAnnotation by debug {
        annotationMarker * optional(annotationUseSiteTarget) * unescapedAnnotation
    }

    val multiAnnotation by debug {
        annotationMarker * optional(annotationUseSiteTarget) * listOfUnescapedAnnotations
    }

    val parameter by debug {
        simpleIdentifier * token(COLON) * type
    }