[Bug c++/88694] constexpr isn't captured correctly in lambda

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88694

--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed by r11-88:

    c++: Avoid inconsistency in lambda fn's this pointer name [pr94807]

            * coroutines.cc (morph_fn_to_coro): Just check for
            closure_identifier.
            * pt.c (tsubst_function_decl): Update lambda fn's this_ptr name.


We could add the testcase from comment 4.