SFINAE friendliness can be quite a curse. It often transforms reasonably comprehensible error messages into full-scale Agatha Christie mysteries (the compiler output even being of comparable length). So I'm not convinced (at the moment) that a metaprogramming library should be SFINAE-friendly.
Yep, this is something where compilers need to improve. It should treat the diagnostic to undefined template instantiation the same way as overload resolution failure. This way you can have a trace back to the original error, instead of showing a bunch of unrelated errors. Paul -- View this message in context: http://boost.2283326.n4.nabble.com/Simple-C-11-metaprogramming-tp4676344p467... Sent from the Boost - Dev mailing list archive at Nabble.com.