[Bug c++/54055] spurious(?) "invalid use of incomplete type" warning in template definition

[daniel.kruegler at googlemail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54055

Daniel Krügler <daniel.kruegler at googlemail dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |daniel.kruegler at
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--- Comment #1 from Daniel Krügler <daniel.kruegler at googlemail dot com> 2012-07-20 19:18:03 UTC ---
Your example can be reduced to the following model code:

template<typename T>
struct A
{
  struct B : A { };
};

I can assure you that you cannot rely on that. This example has recently been
raised to the committee and it was not 100% clear what the result should be. A
new core language issue will be opened for this. The problem is that some
arguments were brought pointing to the equivalent example

struct A
{
  struct B : A { };
};

being invalid since ages. There is no tendency to make the latter valid, but is
has to be clarified what the state of the first (your) example will be.