implicit typename deprecated, "see documentation"

[Gabriel Dos Reis]

Joe Buck <jbuck@synopsys.com> writes:

| A message like
| 
| filename.hh.556: warning: `foof' is a type, but has not been declared as a type
| filename.hh.556: (missing `typename' keyword?)
| filename.hh.556: This warning will become an error in future releases.
| 
| might be better.

Completely agreed.  I wish we had this kind of suggestion some months
ago. 

-- Gaby