[RFC] Cleaning and extening the diagnostics machinery

[Gabriel Dos Reis]

"Joseph S. Myers" <jsm28@cam.ac.uk> writes:

| On 31 May 2001, Gabriel Dos Reis wrote:
| 
| >    - "Sorry, unimplemented: " for unimplemented fonctionalities;
| 
| I'd like two versions of this, one which acts as an error and one which
| acts as a warning.

A warning for an unimplemented fonctionality?  What usage do you see
for it?

-- Gaby