[Bug libstdc++/51013] complex::{imag,real}() should maintain lvalue-returning extension in C++11

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51013

--- Comment #5 from Jason Merrill <jason at gcc dot gnu.org> 2011-11-08 
01:08:16 UTC ---
Hmm, I think adding the overloads would interfere with usage of complex
temporaries in a constant expression.