[Bug c++/92851] Lambda capture of *this with mutable is not mutable

[flast at flast dot jp]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92851

--- Comment #2 from Kohei Takahashi <flast at flast dot jp> ---
(In reply to Jonathan Wakely from comment #1)
> Please provide a complete testcase not a URL, as required by
> https://gcc.gnu.org/bugs/

Sorry, here is reproducible complete code.

----
struct S
{
    int a;

    void foo() const
    {
        [*this]() mutable
        {
            a = 0;
        }();
    }
};
----

GCC rejects with following message, but clang not.

----
prog.cc: In lambda function:
prog.cc:9:15: error: assignment of member 'S::a' in read-only object
    9 |             a = 0;
      |             ~~^~~

----