GCC 4.4 compatibility: ambiguous std::to_string() overload.
GCC 4.4 compatibility: explicit std::reference_wrapper cconstructor.
GCC 4.4 compatibility: no comparison operators for strongly-typed enums.
GCC 4.4 compatibility: can't construct std::tuple this way.

This was the most cryptic error message ever.
MSVC 2013 compatibility: nullptr-related issues.

I wonder why this wasn't an issue on GCCC < 4.6.
MSVC 2013 compatibility: work around internal compiler error.
MSVC 2013 compatibility: aaargh gaah.

I have this weird feeling that this stuff won't be fixed in next
release.