[C++ Patch] PR 51494 (and 52183)

[Paolo Carlini]

Hi,

a related/duplicate issue went into Bugzilla today, thus I decided to 
return to the RFC/Patch which I posted back in December 
(http://gcc.gnu.org/ml/gcc-patches/2011-12/msg01593.html): as far as I 
can see my analysis still stands and, to be clear, I'm proposing this 
kind of patch for post-4.7.0, at this point. The below, compared to the 
old draft proposal is a bit tidier, but should still do the right thing, 
it fixes the new more involved testcase too.

Tested x86_64-linux.

Thanks,
Paolo.

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