reflection2_3.go

switch v.Kind() {
	case reflect.Map:
	// Map key must either have string kind, have an integer kind,
	// or be an encoding.TextUnmarshaler.
	t := v.Type()
	switch t.Key().Kind() {
		case reflect.String,
			reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
			reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
 		default:
 			if !reflect.PtrTo(t.Key()).Implements(textUnmarshalerType) {
 				d.saveError(&UnmarshalTypeError{Value: "object", Type: v.Type(), Offset: int64(d.off)})
 				d.off --
 				d.next() // skip over { } in input
 				return
 			}
 	}
 	if v.IsNil() {
 		v.Set(reflect.MakeMap(t))
 	}
 	case reflect.Struct:
 		// ok
 	default:
 		d.saveError(&UnmarshalTypeError{Value: "object", Type: v.Type(), Offset: int64(d.off)})
		d.off --
 		d.next() // skip over { } in input
 		return
}