[Bug c++/60775] Instantiates unused class template member function and therefor reports error

[gunther.laure at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60775

--- Comment #1 from Gunther Laure <gunther.laure at gmail dot com> ---
Created attachment 32560
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=32560&action=edit
Testcase