[politician]

Whew, that's a relief! If I understand correctly, then I think you'll have a better experience if you practice doing something like this when writing tests:

  foo, fooErr := doit()
  require.NotNil(foo)
  require.NoError(fooErr)
  _, _ = foo, fooErr // alternative if you don't want the asserts for some reason, remember to come back later and delete though

  // ...repl churn code... 

Using the stretchr/testify/require package. This code defines both variables, gives the error a unique name in the scope, and then references the names in two asserts. You won't have to deal with unreferenced name errors in the "repl churn", so you can comment/uncomment code as you go.