// Those usually end in a tilde followed by one or more ASCII digits.
	if tilde := strings.LastIndexByte(short, '~'); tilde >= 0 && tilde < len(short)-1 {
		suffix := short[tilde+1:]
		suffixIsDigits := true
		for _, r := range suffix {
			if r < '0' || r > '9' {
				suffixIsDigits = false
				break
			}
		}
		if suffixIsDigits {
			return fmt.Errorf("trailing tilde and digits in path element")
		}
	}

)

type Operator uint

//go:generate stringer -type Operator -linecomment tokens.go

const (
	_ Operator = iota

	// Def is the : in :=
	Def   // :
	Not   // !
	Recv  // <-
	Tilde // ~

	// precOrOr
	OrOr // ||

	// precAndAnd
	AndAnd // &&

	// precCmp
	Eql // ==
	Neq // !=
	Lss // <
	Leq // <=
	Gtr // >
	Geq // >=

	// precAdd
	Add // +

func _[_ t[t] | t[t]]() {}

// Single-expression type parameter lists and those that don't start
// with a (type parameter) name are considered array sizes.
// The term must be a valid expression (it could be a type incl. a
// tilde term) but the type-checker will complain.
type (
        _[t] t
        _[t|t] t

        // These are invalid and the type-checker will complain.
        _[~t] t
        _[~t|t] t
        _[t|~t] t

// type restrictions of a type, if any.
//
// For all types other than *types.TypeParam, *types.Interface, and
// *types.Union, this is just a single term with Tilde() == false and
// Type() == typ. For *types.TypeParam, *types.Interface, and *types.Union, see
// below.
//
// Structural type restrictions of a type parameter are created via

      emoji_generator: !!python/name:materialx.emoji.to_svg
  - pymdownx.inlinehilite
  - pymdownx.magiclink
  - pymdownx.smartsymbols
  - pymdownx.superfences
  - pymdownx.tilde
  - pymdownx.tabbed:
      alternate_style: true
  - tables

plugins:
  - search
  - redirects:
      redirect_maps:
        # Redirect all feature pages to features/*

						case 0x81: // U+0301 COMBINING ACUTE ACCENT
							s = "\u00cd" // U+00CD LATIN CAPITAL LETTER I WITH ACUTE
						case 0x83: // U+0303 COMBINING TILDE
							s = "\u0128" // U+0128 LATIN CAPITAL LETTER I WITH TILDE
						case 0x88: // U+0308 COMBINING DIAERESIS
							s = "\u00cf" // U+00CF LATIN CAPITAL LETTER I WITH DIAERESIS
						default:
						}
						if s != "" {
							c.pDst = oldPDst

		// in interfaces and syntactically cannot be empty.
		if t.Len() == 0 {
			w.error("empty union")
			break
		}
		for i, t := range t.terms {
			if i > 0 {
				w.string(termSep)
			}
			if t.tilde {
				w.byte('~')
			}
			w.typ(t.typ)
		}

	case *Interface:
		if w.ctxt == nil {
			if t == universeAnyAlias.Type().Underlying() {

		// in interfaces and syntactically cannot be empty.
		if t.Len() == 0 {
			w.error("empty union")
			break
		}
		for i, t := range t.terms {
			if i > 0 {
				w.string(termSep)
			}
			if t.tilde {
				w.byte('~')
			}
			w.typ(t.typ)
		}

	case *Interface:
		if w.ctxt == nil {
			if t == universeAnyAlias.Type().Underlying() {

		if !t.includes(V) {
			// If V ∉ t.typ but V ∈ ~t.typ then remember this type
			// so we can suggest it as an alternative in the error
			// message.
			if alt == nil && !t.tilde && Identical(t.typ, under(t.typ)) {
				tt := *t
				tt.tilde = true
				if tt.includes(V) {
					alt = t.typ
				}
			}
			return true
		}
		return false
	}) {
		if cause != nil {
			var detail string
			switch {

		if !t.includes(V) {
			// If V ∉ t.typ but V ∈ ~t.typ then remember this type
			// so we can suggest it as an alternative in the error
			// message.
			if alt == nil && !t.tilde && Identical(t.typ, under(t.typ)) {
				tt := *t
				tt.tilde = true
				if tt.includes(V) {
					alt = t.typ
				}
			}
			return true
		}
		return false
	}) {
		if cause != nil {
			var detail string
			switch {