Concept-check bug ?

[Gabriel Dos Reis]

Jonathan Wakely <cow@compsoc.man.ac.uk> writes:

| Hi y'all,
| 
|     #define _GLIBCXX_CONCEPT_CHECKS
|     #include <vector>
| 
|     struct A {
|         std::vector<A> v;
|     };
| 
| This produces concept-check errors because A is incomplete at the point
| of declaring v.
| 
| Is this code really illegal, or just a flaw in the concept-checks ?

I think it is invalid (how can T be CopyConstructible if it is not
complete?), which annoys me more often than not.  I always 
forget to raise the issue with LWG.  It is ridiculous.

-- Gaby