[Bug c++/90725] New: implicitly used 'this' not diagnosed in static member fn declaration

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90725

            Bug ID: 90725
           Summary: implicitly used 'this' not diagnosed in static member
                    fn declaration
           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: ---

struct S {
  int a;
  static int foo() noexcept(noexcept(a));
};

is compiled fine, but 'this' cannot be used in a static member function
declaration.  This one we handle ok:

struct S2 {
  int a;
  static int foo() noexcept(noexcept(this->a));
};