C++ PATCH for c++/56567 (ICE with lambda returning init-list)

[Jason Merrill]

On 03/08/2013 10:54 AM, Jason Merrill wrote:
> My initial proposal for allowing general return type deduction allowed
> deduction of std::initializer_list, which is not permitted by C++11. But
> this doesn't make sense, because the underlying array will immediately
> leak, so we should just give an error even in C++1y.

As pointed out in the PR, this approach was wrong because it's possible 
to have an expression with std::initializer_list type; the thing 
returned might not have itself been a brace-enclosed init list.  So 
let's catch that earlier.

Tested x86_64-pc-linux-gnu, applying to trunk.


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