Hello,
Another day I talked with a workmate and we perceived that's package has an interface validate only method Error() maybe we should validate likewise Is/As/Unwrap.

See lines below:

• Unwrap
  

  go/src/errors/wrap.go

  Lines 15 to 17 in 0e08b02

  	u, ok := err.(interface {
  	Unwrap() error
  	})

• Is
  

  go/src/errors/wrap.go

  Lines 50 to 52 in 0e08b02

  	if x, ok := err.(interface{ Is(error) bool }); ok && x.Is(target) {
  	return true
  	}

• As
  

  go/src/errors/wrap.go

  Lines 96 to 98 in 0e08b02

  	if x, ok := err.(interface{ As(any) bool }); ok && x.As(target) {
  	return true
  	}

• Interface error
  

  go/src/builtin/builtin.go

  Lines 280 to 282 in 0e08b02

  	type error interface {
  	Error() string
  	}

I will propose two ways then we need to choose only one.

1. Add these methods to the interface error

type error interface {
	Unwrap() error
	Is(error) bool
	As(any) bool
	Error() string
}

2. Create a new interface public

type Error interface {
	Unwrap() error
	Is(error) bool
	As(any) bool
	Error() string
}

Does this make sense?

see ya Gophers