[Bug c++/83818] g++ class template parameter deduction discards const qualifier

[bugzilla.gcc.karo at cupdev dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83818

--- Comment #1 from Karolin varner <bugzilla.gcc.karo at cupdev dot net> ---
Created attachment 43119
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43119&action=edit
Test case