[Bug c/39121] strange behavior in chained operations

[frankhb1989 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=39121

frankhb1989 at gmail dot com changed:

           What    |Removed                     |Added
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                 CC|                            |frankhb1989 at gmail dot com

--- Comment #9 from frankhb1989 at gmail dot com ---
This should work since C++11 because the rules of builtin assignment were
modified (CWG 222; see also CWG 637). However, it is still undefined in C11,
even if the new "sequenced before" wording has been copied from C++11
(WG21/N1944).
Not sure if any diagnostics should be changed.