func Is() does not works with errors.Wrap or errors.Wrapf

[waichee]

Checking of a error type in the error chain only works for errors wrapped with fmt.Errorf fmt.Errorf("some %w", err)

Errors wrapped with errors.Wrap(err, "some stuff") does not work when being checked with

var specialError = errors.New("defined type error")

err1 := fmt.Errorf("some %w", specialError)

err2 := errors.Wrap(specialError, "some stuff")

// this works
errors.Is(err1, specialError) 

// this doesnt work
errors.Is(err2, specialError) 

[puellanivis]

Which version of the errors package are you using? If you are not using the latest master branch (so, you’re using 0.8.1 or any other release) then the package is incompatible with the standard errors library.

We are working on cutting a new release that will be compatible with standard errors package expansions. But it’s kind of slow going as everything is done by volunteers.

[waichee]

ah master branch works! thanks

[aperezg]

Now also in a new v0.9.0 release