func WithInstance(i string) ProblemExtra {
	return func(p *problem) {
		p.fields["instance"] = i
	}
}
// WithInstance allows the instance field to be added to the problem response.
WithInstance allows the instance field to be added to the problem response.
// WithInstance allows the instance field to be added to the problem response .
func WithInstance(i string) ProblemExtra {
	return func(p *problem) {
		p.fields["instance"] = i
	}
}
func WithInstance ( i string ) ProblemExtra { return func ( p * problem ) { p . fields [ " " ] = i } }
WithInstance allows the instance field to be added to the problem response.
WithInstance allows the instance field to be added to the problem response .