https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88158

            Bug ID: 88158
           Summary: Document designated initializer support in C++
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: sandra at gcc dot gnu.org
  Target Milestone: ---

The GCC manual section on designated initializers says "This extension is not
implemented in GNU C++."  But, by experimentation, I found that g++ does accept
the designated initializer syntax but complains if the fields aren't named in
the order they appear in the struct definition.

Also, I found this patch via inspection of the code and "svn blame"

https://gcc.gnu.org/ml/gcc-patches/2017-11/msg01026.html

which implements C++2A designated initializers.  The manual ought to say that
is supported, in addition to documenting whatever it is that g++ accepts in
non-C++2A mode.

I'm not an expert on the c++ front end, so maybe someone more familiar with
this code can clarify what is going on here and I can beat it into shape for
the manual.

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