[Bug c++/91368] New: Implement P1301R4: [[nodiscard("with reason")]]

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91368

            Bug ID: 91368
           Summary: Implement P1301R4: [[nodiscard("with reason")]]
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mpolacek at gcc dot gnu.org
  Target Milestone: ---

As per <http://wg21.link/p1301r4>.