Report uses of variables that are nil

When code has already dealt with a variable being nil, it doesn't usually make sense to continue referencing that variable. e.g.

func foo() error {
  result, err := DoSomething()
  if err != nil {
    return err
  }
  if result.IsBad() {
    return err
  }
  return nil
}

Usage

go get github.com/devnev/go-lint-ref-after-nil-check
go-lint-ref-after-nil-check source_file.go source_dir

Status

This has not been tested on a real codebase yet.