[Bug c++/65042] gcc5 has a template depth problem that was fine in gcc4

[mcepl at cepl dot eu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65042

--- Comment #2 from Matěj Cepl <mcepl at cepl dot eu> ---
Created attachment 34741
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34741&action=edit
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