func IsStitch(err error) *ConnWriter {
	if err == nil {
		return nil
	}
	es, ok := err.(*ErrStitch)
	if !ok {
		return nil
	}
	return es.Writer
}
// IsStitch returns true if err is a stitching error.
IsStitch returns true if err is a stitching error.
// IsStitch returns true if err is a stitching error .
func IsStitch(err error) *ConnWriter {
	if err == nil {
		return nil
	}
	es, ok := err.(*ErrStitch)
	if !ok {
		return nil
	}
	return es.Writer
}
func IsStitch ( err error ) * ConnWriter { if err == nil { return nil } es , ok := err . ( * ErrStitch ) if ! ok { return nil } return es . Writer }
IsStitch returns true if err is a stitching error.
IsStitch returns true if err is a stitching error .