[Bug c++/119996] New: [modules] Inline reference to a TU-local entity is nulled when used

[gulackeg at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119996

            Bug ID: 119996
           Summary: [modules] Inline reference to a TU-local entity is
                    nulled when used
           Product: gcc
           Version: 15.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gulackeg at gmail dot com
  Target Milestone: ---

Code (https://godbolt.org/z/hK4aWfMo7):

  // m.cpp:
  module;
  #include <cstdio>
  export module m;
  static void f() { std::puts(__FILE__); }
  export inline auto &fr = f;

  // main.cpp:
  #include <cassert>
  import m;
  int main() {
    assert(&fr != nullptr);
    fr();
  }

GCC accepts the above code, but the variable `fr` is nulled at runtime (i.e.,
the assertion fails). This appears to be an overlooked case in the resolution
of Bug 119551.