[Bug libstdc++/107894] New: [feature request] _GLIBCXX_ASSERTIONS for std::optional

[tim at klingt dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107894

            Bug ID: 107894
           Summary: [feature request] _GLIBCXX_ASSERTIONS for
                    std::optional
           Product: gcc
           Version: 12.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: tim at klingt dot org
  Target Milestone: ---

`_GLIBCXX_ASSERTIONS` does not enable any API validation for std::optional.
e.g. `operator->` translates to `address_to`:
https://github.com/gcc-mirror/gcc/blob/master/libstdc%2B%2B-v3/include/std/optional#L969-L970

libc++ on the other hand has assertions that can detect invalid uses:
https://github.com/llvm/llvm-project/blob/main/libcxx/include/optional#L930-L937


it would be great if libstdc++ could perform the same validation