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    cards_layout: custom
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func (t *TypeParam) is(f func(*term) bool) bool {
	return t.iface().typeSet().is(f)
}

// underIs calls f with the underlying types of the specific type terms
// of t's constraint and reports whether all calls to f returned true.
// If there are no specific terms, underIs returns the result of f(nil).
func (t *TypeParam) underIs(f func(Type) bool) bool {
	return t.iface().typeSet().underIs(f)

   *
   * @since 13.0
   */
  public class TypeSet extends ForwardingSet<TypeToken<? super T>> implements Serializable {

    @CheckForNull private transient ImmutableSet<TypeToken<? super T>> types;

    TypeSet() {}

    /** Returns the types that are interfaces implemented by this type. */
    public TypeSet interfaces() {
      return new InterfaceSet(this);
    }

   *
   * @since 13.0
   */
  public class TypeSet extends ForwardingSet<TypeToken<? super T>> implements Serializable {

    @CheckForNull private transient ImmutableSet<TypeToken<? super T>> types;

    TypeSet() {}

    /** Returns the types that are interfaces implemented by this type. */
    public TypeSet interfaces() {
      return new InterfaceSet(this);
    }

		}

	default:
		// For externally defined implementations of Type.
		// Note: In this case cycles won't be caught.
		w.string(t.String())
	}
}

// typeSet writes a canonical hash for an interface type set.
func (w *typeWriter) typeSet(s *_TypeSet) {
	assert(w.ctxt != nil)
	first := true
	for _, m := range s.methods {
		if !first {
			w.byte(';')
		}
		first = false
		w.string(m.name)

		}

	default:
		// For externally defined implementations of Type.
		// Note: In this case cycles won't be caught.
		w.string(t.String())
	}
}

// typeSet writes a canonical hash for an interface type set.
func (w *typeWriter) typeSet(s *_TypeSet) {
	assert(w.ctxt != nil)
	first := true
	for _, m := range s.methods {
		if !first {
			w.byte(';')
		}
		first = false
		w.string(m.name)

			if reportf != nil {
				reportf("%s cannot be compared", t)
			}
			return false
		}
		return true
	case *Interface:
		if dynamic && !isTypeParam(T) || t.typeSet().IsComparable(seen) {
			return true
		}
		if reportf != nil {
			if t.typeSet().IsEmpty() {
				reportf("empty type set")
			} else {
				reportf("incomparable types in type set")
			}
		}
		// fallthrough
	}
	return false
}

		}
		T, ok := under(obj.Type()).(*Interface)
		if !ok {
			t.Fatalf("%s: %v is not an interface (invalid test case)", body, obj)
		}

		// verify test case
		got := T.typeSet().String()
		if got != want {
			t.Errorf("%s: got %s; want %s", body, got, want)
		}
	}
}

func (t *TypeParam) is(f func(*term) bool) bool {
	return t.iface().typeSet().is(f)
}

// underIs calls f with the underlying types of the specific type terms
// of t's constraint and reports whether all calls to f returned true.
// If there are no specific terms, underIs returns the result of f(nil).
func (t *TypeParam) underIs(f func(Type) bool) bool {
	return t.iface().typeSet().underIs(f)

			if reportf != nil {
				reportf("%s cannot be compared", t)
			}
			return false
		}
		return true
	case *Interface:
		if dynamic && !isTypeParam(T) || t.typeSet().IsComparable(seen) {
			return true
		}
		if reportf != nil {
			if t.typeSet().IsEmpty() {
				reportf("empty type set")
			} else {
				reportf("incomparable types in type set")
			}
		}
		// fallthrough
	}
	return false
}