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

//         TypeArgs []typeOff
//         BaseType typeOff
//     }
//
//     type UnionType struct {
//         Tag     itag // interfaceType
//         Terms   []struct {
//             tilde bool
//             Type  typeOff
//         }
//     }
//
//
//
//     type Signature struct {
//         Params   []Param
//         Results  []Param

		// 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 {

/**
 * {@link String}用の変換ユーティリティです。
 *
 * @author higa
 */
public abstract class StringConversionUtil {

    /** WAVE DASH */
    public static final char WAVE_DASH = '\u301C';

    /** FULLWIDTH TILDE */
    public static final char FULLWIDTH_TILDE = '\uFF5E';

    /** DOUBLE VERTICAL LINE */
    public static final char DOUBLE_VERTICAL_LINE = '\u2016';

    /** PARALLEL TO */

func (s *_TypeSet) underIs(f func(Type) bool) bool {
	if !s.hasTerms() {
		return f(nil)
	}
	for _, t := range s.terms {
		assert(t.typ != nil)
		// x == under(x) for ~x terms
		u := t.typ
		if !t.tilde {
			u = under(u)
		}
		if debug {
			assert(Identical(u, under(u)))
		}
		if !f(u) {
			return false
		}
	}
	return true
}

func (s *_TypeSet) underIs(f func(Type) bool) bool {
	if !s.hasTerms() {
		return f(nil)
	}
	for _, t := range s.terms {
		assert(t.typ != nil)
		// x == under(x) for ~x terms
		u := t.typ
		if !t.tilde {
			u = under(u)
		}
		if debug {
			assert(Identical(u, under(u)))
		}
		if !f(u) {
			return false
		}
	}
	return true
}

			}
		// Unreserved according to RFC 3986 sec 2.3
		// "For consistency, percent-encoded octets in the ranges of
		// ALPHA (%41-%5A and %61-%7A), DIGIT (%30-%39), hyphen (%2D),
		// period (%2E), underscore (%5F), or tilde (%7E) should not be
		// created by URI producers
		case '-', '.', '_', '~':
			continue
		case '%':
			// When normalizing do not re-encode valid escapes.