bug#31242: Gnus on 26.1 RC1 with x86_64-w64-mingw32

[Tak Kunihiro]

I downloaded 26.1 RC1 (GNU Emacs 26.1 (build 1, x86_64-w64-mingw32) of 
2018-04-10).

  https://lists.gnu.org/archive/html/emacs-devel/2018-04/msg00287.html
  https://alpha.gnu.org/gnu/emacs/pretest/windows/emacs-26.1-rc1-x86_64.zip

Gnus with the following configuration gives error althouth that under 25.3
works.

  $ cd /c/emacs-26.1-rc1/bin
  $ ./runemacs.exe -Q
  C-x C-f ~/.gnus.el
  M-x eval-buffer
  M-x gnus

  Opening connection to imap.gmail.com via tls...
  Unable to open server nnimap+gmail due to: auth-source-netrc-parse-entries: 
Unexpected ‘machine’ token at line 4

I'm not sure if this problem is coming from my confirugration or Emacs 26.1 RC1.
Can you suggest how I trace this down?


#+BEGIN_SRC emacs-lisp
(setq gnus-fetch-old-headers 'some)
(setq gnus-select-method
      '(nnimap "gmail"
               (nnimap-address "imap.gmail.com") ; imap.googlemail.com
               (nnimap-server-port 993)
               (nnimap-stream ssl)))

(setq message-send-mail-function 'smtpmail-send-it
      smtpmail-starttls-credentials '(("smtp.gmail.com" 587 nil nil))
      smtpmail-auth-credentials '(("smtp.gmail.com" 587
                                   "homeros.misasa@gmail.com" nil))
      smtpmail-default-smtp-server "smtp.gmail.com"
      smtpmail-smtp-server "smtp.gmail.com"
      smtpmail-smtp-service 587
      gnus-ignored-newsgroups "^to\\.\\|^[0-9. ]+\\( \\|$\\)\\|^[\"]\"[#'()]")
#+END_SRC