[Bug libstdc++/80229] [7 Regression] shared_ptr gives an error when is_function is true

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80229

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2017-03-28
      Known to work|                            |6.3.1
           Assignee|unassigned at gcc dot gnu.org      |redi at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The _M_enable_shared_from_this parameters are only const to save needing to use
remove_const<_Yp>::type to get the non-const type, so not needed. I have a
patch.