[C++ Patch] PR 68754 ("Explicitly defaulted constexpr assignment operator fails to compile")

[Paolo Carlini <paolo dot carlini at oracle dot com>]

Hi,

the main issue, a C++14 rejects-valid, is already fixed in trunk, and a 
while ago I added a testcase for that. However, Andrew noticed that in 
C++11 mode we emit redundant and also a bit puzzling diagnostic (ending 
with one of those annoying "... because:" and nothing after which 
unfortunately we emit in some other cases too). Comparing to, eg, clang 
too, I think we can make progress by simply returning early after the 
first hard error. Also, as an additional tweak, we might replace the 
second error with an inform, per the usual scheme. Tested x86_64-linux.

Thanks, Paolo.

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